Journals >Opto-Electronic Engineering
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2010
Volume: 37 Issue 7
28 Article(s)
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Research Article
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[in Chinese]
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 1 (2010)
Analysis of the Radiometric Characteristics on Changing Temperature Target with Millimeter Wave Radiometer
NIE Jian-ying, LI Xing-guo, LOU Guo-wei, and GONG Bing
Millimeter wave characteristics differ from those of microwaves, infrared or optical system, and it has some distinct advantages over microwave, infrared, or optical system. Currently, passive detection techniques with the Millimeter Wave (MMW) radiometer play important role in homing guidance of anti-armour missile anMillimeter wave characteristics differ from those of microwaves, infrared or optical system, and it has some distinct advantages over microwave, infrared, or optical system. Currently, passive detection techniques with the Millimeter Wave (MMW) radiometer play important role in homing guidance of anti-armour missile and end-sensing-cartridge. In view of the factors such as kinetic energy of the target, the target’s temperatures are changing. This paper studied on the radiometric characteristics of the changing temperatures target with passive millimeter wave seeker. The relationship among the electrolytic coefficients, radiometric characteristics of the changing temperatures target and the radiation of the targets was analyzed based on the experiments. Moreover, the angles of detector and the detection distance were analyzed. And then, the main factors for the method of passive MMW stealth technology were given..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 1 (2010)
Solution System of Minimum-magnitude Equation about the Screw of a Rigid-body Motion of Manipulator
AN Kai, and MA Jia-guang
The solution system of minimum-magnitude equation about the screw of a rigid-body motion of manipulator is given in this paper, and it has been used to solve a special restricted problem. The result shows that the solution system of minimum-magnitude equation not only can solve special restricted problem readily, but aThe solution system of minimum-magnitude equation about the screw of a rigid-body motion of manipulator is given in this paper, and it has been used to solve a special restricted problem. The result shows that the solution system of minimum-magnitude equation not only can solve special restricted problem readily, but also can be used to solve other restricted problems..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 8 (2010)
Integral Sliding Mode Variable Structure Control of High Precision EO Servo-stabilized Platform
ZHOU Yang, WANG Lei, and ZHOU Tao
For low-speed problem of high precision Opto-electronic (EO) servo-stabilized platform, the precision and performance are always affected by slip-stick, the reason of which is the non-linear friction. An approach of integral sliding mode variable structure controller is proposed, and a novel reaching rule is designed. For low-speed problem of high precision Opto-electronic (EO) servo-stabilized platform, the precision and performance are always affected by slip-stick, the reason of which is the non-linear friction. An approach of integral sliding mode variable structure controller is proposed, and a novel reaching rule is designed. Actual results of the system show that the presented controller can solve the problem of stability when system moving large range rapidly, eliminate ”creeping” phenomenon, and improve the dynamic and static quality effectively..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 12 (2010)
Tracking Target in Video Sequences Based on Chaos Particle Filter
LIU Shi-jun, PENG Zhen-min, ZHAO Shu-bin, and ZHANG Qi-heng
Referring to influence of illumination，shape transformation and occlusion on the tracking of the moving target in complex background, a anti-occluding and robust tracking algorithm is proposed based on chaos particle filter frame, in which the multi-cue likelihood model and occlusion dealing algorithm are constructed. Referring to influence of illumination，shape transformation and occlusion on the tracking of the moving target in complex background, a anti-occluding and robust tracking algorithm is proposed based on chaos particle filter frame, in which the multi-cue likelihood model and occlusion dealing algorithm are constructed. In this algorithm, through chaos optimization search, the particles are optimized, the degeneracy problem is efficiently overcome and the computation is reduced. In the multi-cue likelihood model, some feature of choice is improved, which makes the algorithm robust. At the same time, the occlusion dealing makes the algorithm anti-occluding. Experimental simulation results based on the theoretical data and the actual scenes show that this algorithm is anti-occluding and robust..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 16 (2010)
Photopolarimetric Characteristic of Space Target
LI Ya-nan, SUN Xiao-bing, QIAO Yan-li, HONG Jin, and ZHANG Qiao
Polarization is one of the important optical characteristics of target. Certain materials used in constructing satellites possess unique polarization because of certain space target designs and different orbits. Thus polarization can be considered for target detection and recognition. Photopolarimetric characteristic oPolarization is one of the important optical characteristics of target. Certain materials used in constructing satellites possess unique polarization because of certain space target designs and different orbits. Thus polarization can be considered for target detection and recognition. Photopolarimetric characteristic of space target materials and model are measured and analyzed. Results show that the polarization properties of material are significant for target detection, and the attitude of solar panel has great effect on the polarization of satellite. This research can give support to the application for space target detection and recognition..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 24 (2010)
Analysis for Infrared Radiation Sensitivity of Space Satellite Based on Degradation of Thermal Control Coatings
YANG Ming, WU Xiao-di, Lü Xiang-yin, YANG Hua, and MA Li-fang
Because of the degradation of the thermal control coatings in harsh space environment, the error between the real parameters and the design parameter must happen. However, calculating the satellite’s temperature and infrared radiation repeatedly was time-consuming. Firstly, based on the simulation experimental data, thBecause of the degradation of the thermal control coatings in harsh space environment, the error between the real parameters and the design parameter must happen. However, calculating the satellite’s temperature and infrared radiation repeatedly was time-consuming. Firstly, based on the simulation experimental data, the degradation model of the thermal control coatings was established. Then, the temperature sensitivity and infrared radiation sensitivity formulae of the surface node of the satellite were derived, according to the calculation model of the temperature and infrared radiation. Combined with specific satellite’s parameter, the temperature sensitivity and infrared radiation sensitivity were calculated. The result shows that the change of infrared radiation caused by the degradation of the thermal control can be analyzed by using the infrared radiation sensitivity directly to avoid the repeat calculation of the satellite’s temperature and infrared radiation..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 30 (2010)
Dynamic Thermal/Structural/Optical Analysis and Design for Aerial Camera Lens System
LIAO Jing-yu, GAO Xiao-dong, LAN Gong-pu, and ZHAO Ren-jie
When the ambient temperature dynamically changes, internal temperature grads in the lens system will produce non-uniform changes of refractive index, thickness and radius, which degrade the image quality. Reasonable thermal control methods are expected to effectively reduce the temperature grads and improve image qualiWhen the ambient temperature dynamically changes, internal temperature grads in the lens system will produce non-uniform changes of refractive index, thickness and radius, which degrade the image quality. Reasonable thermal control methods are expected to effectively reduce the temperature grads and improve image quality. Thermal/Structural/Optical (TSO) integrated analysis is used for a whole aerial camera lens system, to emulate the lens temperature field under dynamic thermal environment when the camera carrier goes up. A thermal control method is designed accordingly and lens surface shape is extracted. Lens system Modulation Transfer Function (MTF) is calculated by using lens shape Zernike coefficients to evaluate the image quality under dynamic thermal conditions. Results demonstrate that the designed thermal control can effectively reduce the lens temperature grads in both radial and axial direction. Therefore, the improved lens performance can satisfy high resolution imaging demands..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 36 (2010)
Design and Simulation of the Baffle of a New Type Space Camera
LI Yun, XIANG Li-bin, and LI Li-bo
Because of the space camera’s large Field of View (FOV), stray light is more difficult to eliminate. Therefore, it is difficult to design the baffle. Through the Point Source Transmittance (PST), the suppression indicators of the camera’s stray light are calculated by the standard of the target brightness which is deteBecause of the space camera’s large Field of View (FOV), stray light is more difficult to eliminate. Therefore, it is difficult to design the baffle. Through the Point Source Transmittance (PST), the suppression indicators of the camera’s stray light are calculated by the standard of the target brightness which is detected by the space camera. Based on the suppression indicators, according to the features of space camera and the hood design principles, a two-class shield was designed. The whole space camera was emulated in the TracePro. It is proved that the design of the shield can successfully suppress stray light and meet the requirements of the space camera through the derived point source transmittance curve..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 41 (2010)
Impact of Scattering Angle on Nano-particles Measurement Using Method of Correlation Spectroscopy
ZHAO Jun, KONG Ming, and LI Chun-yan
The impact of scattering angle on nano-particles measurement is studied by using the method of correlation spectroscopy. The system of nano-particles experiment using the method of correlation spectroscopy is reformed to carry out the measurement of nano-particles at different scattering angles. Particles of 30-nanometThe impact of scattering angle on nano-particles measurement is studied by using the method of correlation spectroscopy. The system of nano-particles experiment using the method of correlation spectroscopy is reformed to carry out the measurement of nano-particles at different scattering angles. Particles of 30-nanometer and 200-nanometer were mixed in different proportions, which were measured at scattering angles of 90 degrees and 165 degrees. It shows that accurate measurements can be realized at the two angles for the single particle group. While for the mixed particle group, the experiment results are affected by the mixing ratio of two kinds of particles. Better measurement results were got at the scattering angle of 165 degrees. Therefore the usage of large scattering angle contributes to the inversion of particle size for the hybrid nano-particles size measurement..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 45 (2010)
Ring Effect on Sun Scattered Light Observation System
LI Su-wen, JIANG En-hua, CHEN De-bao, and SI Fu-qi
The passive Differential Optical Absorption Spectroscopy (DOAS) using sun scattered light can perform observation of local total volume of trace gases. To reduce the effect of Ring effect on passive DOAS system, the mechanisms of Ring effect were analyzed in this paper, and the scattered light was divided into elasticiThe passive Differential Optical Absorption Spectroscopy (DOAS) using sun scattered light can perform observation of local total volume of trace gases. To reduce the effect of Ring effect on passive DOAS system, the mechanisms of Ring effect were analyzed in this paper, and the scattered light was divided into elasticity and non-elasticity scattering. The expressions of Ring effect are educed. The calculated Ring is retrieved together with other atmospheric components. Therefore, its effect on the measurement could be restricted to minimum in DOAS system. The experimental result shows that the accuracy of DOAS system is improved..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 49 (2010)
The Measurement of LED Junction Temperature and Thermal Capacity Using Pulse Current
WEN Huai-jiang, and MOU Tong-sheng
The pulse current method is a new method which can measure the junction temperature and thermal capacity of LED simultaneously. By injecting constant short pulse of square-wave current to the LED, the pulse amplitude is equal to rated current, and the LED’s forward voltage is measured at different junction temperaturesThe pulse current method is a new method which can measure the junction temperature and thermal capacity of LED simultaneously. By injecting constant short pulse of square-wave current to the LED, the pulse amplitude is equal to rated current, and the LED’s forward voltage is measured at different junction temperatures. Then, the sensitivity coefficient of forward voltage and junction temperature is obtained under a rated current. Therefore, by measuring the forward junction voltage under the rated current, users can obtain the junction temperature. Finally, by using the junction temperature variation and single pulse of heat input, the thermal capacity can be calculated. This paper studied the influence of pulse width on the measurement of junction temperature and LED’s thermal capacity, and pulse current measurement devices are designed. The results show that, in order to achieve the effect of pulse current on junction temperature measuring accuracy lower than 1℃, the pulse width should be controlled from a few to a dozen μs, and the thermal capacity measurement of using pulse current or thermal integration period is basically consistent..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 53 (2010)
Application of Tikhonov Regularization Method in Zernike Polynomials Fitting
HAN Yu, WU Fan, WAN Yong-jian, and FANG Kai
To acquire coefficients of Zernike polynomials is a discrete ill-posedness problem. Common methods, such as Least Squares Error method, Cram-Schmidt orthogonalization method and Householder transformation method, can not obtain a stable numerical solution. The instability of ill-posedness problem is analyzed and a TikhTo acquire coefficients of Zernike polynomials is a discrete ill-posedness problem. Common methods, such as Least Squares Error method, Cram-Schmidt orthogonalization method and Householder transformation method, can not obtain a stable numerical solution. The instability of ill-posedness problem is analyzed and a Tikhonov regularization method is introduced to solve ill-posed problem. The L curve criterion is used to determine regularization parameter. Simulation result shows that Tikhonov regularization method is stable and effective for solving ill-posedness problem..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 60 (2010)
The Effect of Characteristic of Pad on Surface Form of Optical Flats in Polishing
XIE Rui-qing, LI Ya-guo, WANG Jian, CHEN Xian-hua, HUANG Hao, and XU Qiao
Polishing is a primary means to get ultra-precision surface in optical manufacturing. In order to obtain the effect of characteristic of pad on surface form of optical flats in polishing, the contacting types between pad and workpiece were analyzed and a model was set up. Then the contacting pressure distribution on thPolishing is a primary means to get ultra-precision surface in optical manufacturing. In order to obtain the effect of characteristic of pad on surface form of optical flats in polishing, the contacting types between pad and workpiece were analyzed and a model was set up. Then the contacting pressure distribution on the interface between workpiece and polishing pad was calculated by using finite element method. Furthermore, the effect of pad thickness and sphere radius on pressure distribution was investigated. Based on results of theoretical analysis, a new polishing technique for correcting surface form of optical flats is presented. A 430 mm × 430 mm × 60 mm size fused silica workpiece has been polished in the experiment. By conditioning pad surface to convex form and accurately controlling polishing speed ratio, the form accuracy of workpiece has been improved fast..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 64 (2010)
Photonic Crystal Fiber Grating Based on Structural Change
LIU Yan-yan, XU Cheng-qian, BI Wei-hong, and QI Yue-feng
A kind of photonic crystal fiber grating based on structural change was studied by using the multipole method and the coupled mode theory, the structure model was built, and the principle was analyzed. The effective refractive indexes of the cladding with seven rings of the hexagonal symmetry air-holes varying with theA kind of photonic crystal fiber grating based on structural change was studied by using the multipole method and the coupled mode theory, the structure model was built, and the principle was analyzed. The effective refractive indexes of the cladding with seven rings of the hexagonal symmetry air-holes varying with the wavelength were computed. Moreover, the performance differences of the gratings fabricated by the different photonic crystal fibers were compared. It was shown that the periodic air-holes shrinkage could form grating, and the number of rings of the air-holes in the cladding, the duty ratio of the air-holes, the number of rings of the air-holes shrinkage and the extent of the air-holes shrinkage had the important impact on the transmission characteristics of the photonic crystal fiber grating. Furthermore, the functional relationships that the resonance wavelength and bandwidth varied with these parameters were obtained and the rational explanations were given..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 70 (2010)
The Bandwidth and Crosstalk Analysis of Detection Circuit in Time-division Multiplexing of Fiber-optic Hydrophone
YANG Chun, ZHANG Hua-yong, ZHANG Min, and LIAO Yan-biao
In the time-division multiplexing fiber-optic hydrophone system, it is desired to design the signal detection circuit with large gain and bandwidth. In order to reduce the system noise while suppressing crosstalk between channels, you must select the appropriate circuit bandwidth. This paper analyzes the relationship bIn the time-division multiplexing fiber-optic hydrophone system, it is desired to design the signal detection circuit with large gain and bandwidth. In order to reduce the system noise while suppressing crosstalk between channels, you must select the appropriate circuit bandwidth. This paper analyzes the relationship between the bandwidth and the pulse shape of the signal to be detected and the relationship among circuit bandwidth, pulse width, channel interval, and circuit crosstalk ratio, and gives the analytical expression of the crosstalk ratio. Formulae of demodulated signal error caused by circuit crosstalk are derived, and the result is that the amplitude of the demodulated signal error is proportional to the circuit crosstalk ratio and the Bessel function of the amplitude of the acoustic signal added to the previous channel. The experimental results are consistent with the theoretical analysis..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 75 (2010)
Influence of Erbium Concentration on Erbium Doped Fiber Sources
HAO Yan-ling, and WANG Rui
The influence of erbium doped concentration on the pump efficiency and wavelength stability of erbium doped fiber source was researched. Five type fibers were applied in single pass backward source respectively. And the outputs of the five sources were compared. The pump efficiency of erbium doped fiber source is increThe influence of erbium doped concentration on the pump efficiency and wavelength stability of erbium doped fiber source was researched. Five type fibers were applied in single pass backward source respectively. And the outputs of the five sources were compared. The pump efficiency of erbium doped fiber source is increased as the erbium concentration increases. Cluster effect becomes obvious at high concentration and the pump efficiency is reduced by 20%. The pump threshold value is increased from 18.3 mW to 32.4 mW as the concentration increases. The excellent erbium doped fiber length is decided by the erbium concentration in proportion from experiment results. And the relationship between pump wavelength and source mean wavelength is not influenced by erbium concentration. The temperature stability of source with lower erbium concentration is almost 100 ppm better than that with higher erbium concentration. The optimum erbium concentration is about 110 mol according to experiment..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 81 (2010)
Quick and High Accuracy Wavelength Setting Method for Grating Spectrometer
HUANG Jin-qing, HUANG Mei-zhen, WANG Long, and SHI Man-man
For the structure limit of traditional wavelength scanning systems based on screw mandrel and step motor, they cannot simultaneously work both accurately and quickly. A new active opto-electrical feed-back measurement system based on laser, position sensitive detector and multilateral prism mirror is proposed in this pFor the structure limit of traditional wavelength scanning systems based on screw mandrel and step motor, they cannot simultaneously work both accurately and quickly. A new active opto-electrical feed-back measurement system based on laser, position sensitive detector and multilateral prism mirror is proposed in this paper. The grating is driven by a step motor directly and its rotational position is measured accurately by the active opto-electrical feed-back measurement system. The purpose of the new strategy is to make the wavelength scanning system work not only accurate but also quick. The elementary experimental results are satisfied..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 86 (2010)
Design of a New-type High Spectral Resolution UV-VIS Spectrometer Wavelength Calibration System
ZHAO Fa-cai, WANG Shu-rong, QU Yi, and LI Fu-tian
Referring to limitation of the conventional spectral calibration in Ultraviolet-Visible (UV-VIS) wave band, a high spectral resolution calibration device was built for ultraviolet-visible spectrometer. It primarily consists of a stable 300 W xenon lamp, a Schwartzschild mirror, an echelle grating monochromator, and a cReferring to limitation of the conventional spectral calibration in Ultraviolet-Visible (UV-VIS) wave band, a high spectral resolution calibration device was built for ultraviolet-visible spectrometer. It primarily consists of a stable 300 W xenon lamp, a Schwartzschild mirror, an echelle grating monochromator, and a collimator. The optical system of the monochromator was optimized by using ZEMAX optical design software. The apparatus design is described and analyzed, and results show that it satisfies the design requirements of the monochromator. Spectral region from 270 nm to 500 nm can be scanned, and its spectral resolution is less than 0.05 nm with wavelength accuracy less than 0.05 nm..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 92 (2010)
Algorithms for Imaging-type Absolute Angular Encoder
YUAN Bo, JIAO Xiao-long, and LIN Bin
The algorithms of angle read-out were designed for imaging-type absolute angular encoder on the basis of its working principle. The algorithms for image pretreatment and angular measurement were illuminated separately in this paper. Firstly, the image of code disc was pretreated by graying, smoothing and binarizing sucThe algorithms of angle read-out were designed for imaging-type absolute angular encoder on the basis of its working principle. The algorithms for image pretreatment and angular measurement were illuminated separately in this paper. Firstly, the image of code disc was pretreated by graying, smoothing and binarizing successively to obtain the proper binarized signals. Then, the coarse code and subdivision code, of which the angle is consisted, were read out along the disc’s radial direction and tangential direction, separately. In the end, the feasibility and validity of algorithms were testified in the experiment..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 97 (2010)
The Analysis of Moiré Fringes and Application on the Alignment of Lithography
MA Ping, ZHOU Shao-lin, HU Song, and XU Wen-xiang
Based on the actual application of Moiré fringes for the alignment of lithography, the modulating regulation on Moiré fringes produced by generic and line gratings is discussed according to Fourier optics in this paper，and the low frequency(1, -1) class Moiré fringe which is extensively applied was simulBased on the actual application of Moiré fringes for the alignment of lithography, the modulating regulation on Moiré fringes produced by generic and line gratings is discussed according to Fourier optics in this paper，and the low frequency(1, -1) class Moiré fringe which is extensively applied was simulated. Aimed at two grating marks of the little difference from repeated frequency for the alignment of lithography, the magnified Moiré fringes would be produced with the characteristic sensitive to displacement，which was explained by simulation. Thus，high alignment accuracy of lithography was achieved. Finally, the alignment accuracy of lithography by the alignment method was analyzed briefly..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 102 (2010)
Improvement Algorithm of Minimum-error Thresholding Segmentation Method
ZHU Qi-dan, JING Li-qiu, BI Rong-sheng, and WU Ye-bin
As a generalization of one-dimensional minimum-error threshold segmentation method was widely used in image segmentation. In this paper, two-dimensional minimum-error threshold algorithm and its fast algorithm (here referring to the original method) are improved, and threshold acquirement formula of the original minimuAs a generalization of one-dimensional minimum-error threshold segmentation method was widely used in image segmentation. In this paper, two-dimensional minimum-error threshold algorithm and its fast algorithm (here referring to the original method) are improved, and threshold acquirement formula of the original minimum-error threshold segmentation method was deformed. By using look-up table method, acquirement of two-dimensional threshold is transformed into that of two one-dimensional threshold, so the calculation is simplified and time complexity is reduced from O(L2) to O(L). Experimental results show this decomposition algorithm outperforms original algorithm. Without losing the robustness to noise and needing more time and space, it can get the same segmentation threshold as the original method..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 107 (2010)
Classifier Design Method Based on Conformal Geometric Algebra and Quadratic Programming
LI Mao-kuan, and GUAN Jian
A classifier design method based on conformal geometric algebra and quadratic programming is proposed. From a new point of view, the probability and simplicity of using the conformal geometric algebra to design optimal separation hyersphere is discussed. A geometrical representation of separating hypersphere is firstlyA classifier design method based on conformal geometric algebra and quadratic programming is proposed. From a new point of view, the probability and simplicity of using the conformal geometric algebra to design optimal separation hyersphere is discussed. A geometrical representation of separating hypersphere is firstly introduced based on conformal geometric algebra, by which the two-class optimal separation hyersphere separation problem may be transformed into the training problem based on quadratic programming. According to this, the design and training of multi-class classifier are analyzed. The algorithm not only keeps the advantages of maximizing the margin, generalizing the optimal separating hyperplane to optimal separating hypersphere, but also simplifies computational complexity. Simulation results show that the algorithm is compact and explicit, and the integrations of algorithm have an important significance in the improvement of efficiency..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 114 (2010)
Stereo Viewing Zones Analysis in DLP-based Autostereoscopic Display
TIAN Feng, YU Lei, JIN Jun, and LIU Jin-gao
To obtain low-cost, super-large-panel autostereoscopic display, and the scheme of 3D monitor based on Digital Light Projection (DLP) was adopted. By simulating the light path of lenticular lens, the characteristics of stereo viewing zones were analyzed. According to the structure and principle of the display, the lightTo obtain low-cost, super-large-panel autostereoscopic display, and the scheme of 3D monitor based on Digital Light Projection (DLP) was adopted. By simulating the light path of lenticular lens, the characteristics of stereo viewing zones were analyzed. According to the structure and principle of the display, the light distribution figure of stereo viewing zones was calculated. Viewers who stay at the optimal viewing distance can see good stereo images without crosstalk. The setting method of the optimal viewing distance and pixel matching was studied, and the range for the better stereo images was provided. The study on the stereo viewing zones is useful for the design of such autostereoscopic display devices and achieves 150-inch-large panel stereo display with good telepresence and three-dimensional effect..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 119 (2010)
Analysis of Material Characteristic of Ordered Conducting Polymer Ultrathin Film
ZHENG Hua-jing, XU Jian-hua, JIANG Ya-dong, and YANG Ya-jie
A Langmuir-Blodgett (LB) inducing method was firstly used to prepare single layer and multilayer conducting composite PEDOT-PSS film. The film-forming ability of ionization ODA and ODA-SA monolayer spread on PEDOT-PSS nanoparticles subphase and the behavior of ODA/PEDOT-PSS assembly particles on pure water were firstlyA Langmuir-Blodgett (LB) inducing method was firstly used to prepare single layer and multilayer conducting composite PEDOT-PSS film. The film-forming ability of ionization ODA and ODA-SA monolayer spread on PEDOT-PSS nanoparticles subphase and the behavior of ODA/PEDOT-PSS assembly particles on pure water were firstly investigated. The results indicate that nanoparaticles in suphase pack the ionization monolayer and stable complex Langmuir film was formed at air/water interface. It has been found that the best film-forming conditions for composite film were as follows: molar ration of ODA to SA was 2:1, suphase temperature was 23 centigrade, concentration of PEDOT-PSS in subphse was about 1×10-3 M, and compressing speed and deposition speed were 5 mm/min and 1 mm/min respectively. The SIMS and XRR investigation show that this film exhibits well ordered layer structure..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 126 (2010)
Nanosecond Laser Damage and Modification on Diamond-like Carbon Films
TANG Duo-chang, LI Xiao-hong, YUAN Chun-hua, YANG Hong-dao, and LI Guo-qiang
Diamond-like Carbon (DLC) films prepared by electron beam evaporation deposition were irradiated with a Nd:YAG pulsed laser, operating at different wavelengths(λ=355 nm, 532 nm, 1 064 nm). Different methods including optical microscope, optical profiler and Raman spectrometer were employed for analyzing the films. The Diamond-like Carbon (DLC) films prepared by electron beam evaporation deposition were irradiated with a Nd:YAG pulsed laser, operating at different wavelengths(λ=355 nm, 532 nm, 1 064 nm). Different methods including optical microscope, optical profiler and Raman spectrometer were employed for analyzing the films. The results show that the damage threshold energy density for DLC film flashed by a single laser pulse of different wavelengths is different, and the damage threshold for DLC film flashed by the multipulses laser of same wavelengths is lower. DLC films are modified after laser irradiation. The profile of the irradiated surface shows swelling and crater, resulting from superposition of three laser-induced processes-graphitization, spallation and evaporation. Swelling height and crater depth were determined by laser energy density and the number of laser pulses..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 135 (2010)
Face Recognition Based on Local Gabor Phase Characteristic Fusion
JIANG Yan-xia, and REN Bo
A new face recognition method based on local Gabor phase characteristic fusion and fisher linear discriminant analysis is proposed. In our proposed method, according to the good spatial position and orientation of Gabor filter, a Gabor filter with four frequencies and six orientations is firstly applied to filter face A new face recognition method based on local Gabor phase characteristic fusion and fisher linear discriminant analysis is proposed. In our proposed method, according to the good spatial position and orientation of Gabor filter, a Gabor filter with four frequencies and six orientations is firstly applied to filter face images. Based on Daugman’s method and the local Exclusive-or (XOR) pattern, local Gabor patterns are then extracted to form the characteristic images. Finally, fisher linear discriminant analysis is used to project the characteristic images of each spatial position and orientation into low dimensional space. Neighbor classifier is adopted to the fused projected characteristics to get the recognition result. Experimental results show that our method consistently outperforms other recognition method based on Principal Component Analysis (PCA), fisher linear discriminant analysis and Gabor magnitude pattern fusion..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 139 (2010)
Real-time Hand Segmentation and Fingertip Detection for Interaction
TANG Yong, GU Hong-bin, and ZHOU Lai
To satisfy the demands of hand recognition in computer interaction system, a fast robust hand segmentation and fingertip detection method is proposed. The procedure of segmentation consists of three steps: 1) Skin color segmentation, 2) Contour finding by freeman code, 3) Adaptive spline fitting of the contour. The hanTo satisfy the demands of hand recognition in computer interaction system, a fast robust hand segmentation and fingertip detection method is proposed. The procedure of segmentation consists of three steps: 1) Skin color segmentation, 2) Contour finding by freeman code, 3) Adaptive spline fitting of the contour. The hand could be segmented exactly step by step. Then, the accurate position of the fingertip was determined through the feature of the hand contour based on the segmentation. Experiments show that the proposed method works very well with high hand segmentation and fingertip detection accuracy in different condition, such as complex background, multiple hand direction and finger motion. It is appropriate for the hand recognition in human-computer interaction system..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 7, 145 (2010)
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