Journals >Opto-Electronic Engineering
Contents
2010
Volume: 37 Issue 10
26 Article(s)
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Research Article
Finite Element Analysis of the Focusing Mirror Fastened by Adhesive
GUAN Ying-jun
The methods of establishing ring bonds finite element model——detailed model and equivalent stiffness model are elaborated in order to research the effect of systems with adhesive. Uniform changing temperature load cases are analyzed through the equivalent stiffness model, and then the results from FEA is compared to thThe methods of establishing ring bonds finite element model——detailed model and equivalent stiffness model are elaborated in order to research the effect of systems with adhesive. Uniform changing temperature load cases are analyzed through the equivalent stiffness model, and then the results from FEA is compared to the actual tests. Some of factors which affect surface figure errors such as Poisson’s ratio of adhesive, bonded position, bonds width, bonds thickness etc., are analyzed for optimal design. Choosing an optimal project, the dimension stability of the focusing mirror component is fully analyzed. Besides eccentricity bonds caused by inaccurate bonding process are also researched within the same model. The analysis result shows that the properties of ring bonds can be properly represented by equivalent stiffness model. The optimal design can meet the tolerance demand, and avoid the influence induced by eccentricity bonds..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 1 (2010)
Numerical Simulation of the Infrared Radiation of Satellite Orbit-control Thruster Plume
JIN Wei, LING Yong-shun, and Lü Xiang-yin
To totally obtain infrared characteristic of satellites, it was necessary to know the infrared characteristic of satellite orbit-control thruster plume. A complete model for calculating the infrared radiation of satellite orbit-control thruster plume was founded. The model calculated the plume flow field, absorption coTo totally obtain infrared characteristic of satellites, it was necessary to know the infrared characteristic of satellite orbit-control thruster plume. A complete model for calculating the infrared radiation of satellite orbit-control thruster plume was founded. The model calculated the plume flow field, absorption coefficient and radiative luminance by using Finite Volume Method (FVM) in order. According to the spectral luminance obtained by using the model, the spectral and band radiative intensity at the range of 1 000~4 500 cm-1 were calculated further. Through analysis of the intensity, the spectral intensity values at 1 525 cm-1, 1 700 cm-1, 2 155 cm-1, 2 175 cm-1, 2 350 cm-1 and 3 750 cm-1 are larger than the values at other spectrums; and the largest band intensity may be corresponding to different azimuth angle at different vertical distance to the nozzle exiting plane. The figure of spectral intensity curve at 2 350 cm-1 and 3 750 cm-1 well agrees with the figures in similar papers. The result shows that the calculation model is reliable and accurate..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 6 (2010)
Experimental Research on Satellite Random Vibration Compensation for Intersatellite Laser Communication
XU Bo-qian, and WANG Gang
The negative effect of satellite vibration on the intersatellite laser communication was presented, including the increase of bit error rate. To solve the problem of random vibration compensating, a testbed was designed and assembled,which detects the deflection angle caused by vibration with a high frame frequency areThe negative effect of satellite vibration on the intersatellite laser communication was presented, including the increase of bit error rate. To solve the problem of random vibration compensating, a testbed was designed and assembled,which detects the deflection angle caused by vibration with a high frame frequency area charge coupled device. The testbed simulates and compensates vibration with fast steering mirrors actuated by piezoelectric actuators. As there is difference between sine wave vibration and random vibration, the compensation efficiency factor ηR is defined to evaluate effectiveness of random vibration compensation. The experiment result shows when the sample rate of CCD is three times of that of vibration frequency, the compensation efficiency is remarkable, and the compensation of the testbed is effective..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 11 (2010)
Particle Filter Tracking Algorithm Based on Genetic Algorithm
CHEN Shan-jing, YANG Hua, ZENG Kai, ZHANG Hong, and WANG Yi-cheng
To solve the problem of particle degradation in particle filter tracking algorithm, the improved genetic algorithm is used in the particle re-sampling to improve the diversity of the sample. In the improved genetic algorithm,multinomial re-sampling is applied in selection and copy. An exchange rate of sample is a randoTo solve the problem of particle degradation in particle filter tracking algorithm, the improved genetic algorithm is used in the particle re-sampling to improve the diversity of the sample. In the improved genetic algorithm,multinomial re-sampling is applied in selection and copy. An exchange rate of sample is a random number in given interval in cross-breeding. The Markov chain Monte Carlo move plus Gaussian white noise is used in sample variance and breeding, and the MH sampling algorithm is used to select sample, too. The improved particle filter tracking algorithm not only keeps the high efficient operation, but also improves stability of target tracking. Experimental results show that particle filter tracking algorithm is more stable and more accurate than traditional particle filter tracking algorithm..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 16 (2010)
Small Aerial Photography Stabilized Platform Based on Fuzzy-PID Control
QIU Bao-mei, WANG Feng-juan, and WANG Jian-wen
The design and control of aerial photography stabilized platform is a complicated process owing to mechanic vibration、multi-frame coupled and gyro random drift and so on. It is hard to obtain the exact control model. By designing three frames structure with MEMS gyro, DC servo motor and reduction gear, a small aerial pThe design and control of aerial photography stabilized platform is a complicated process owing to mechanic vibration、multi-frame coupled and gyro random drift and so on. It is hard to obtain the exact control model. By designing three frames structure with MEMS gyro, DC servo motor and reduction gear, a small aerial photography stabilized platform is applied to improve problems of the existing aerial photography stabilized platform, such as the heavy structure,the lacking of adaptability and so on. A Fuzzy-PID controller is proposed. The fuzzy control is used when the error is large, and the PID is used when the error is small, which takes the advantages of these two methods complementarily.Based on the above mentioned, the designs of Fuzzy-PID controller and hardware circuit and the software structure are presented. The experiment data prove that the dynamic and static performance of control system is obviously improved based on fuzzy-PID. The stabilized accuracy can arrive to ±0.3 degree. It can satisfy the requirements of high definition aerial photography..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 23 (2010)
Object Tracking Algorithm Based on Combining Dynamics Template Matching and Kalman Filter
LIANG Xi-ning, YANG Gang, YU Xue-cai, WANG Shi-yang, ZHU Liang-xiao, SU Ke, and CHEN Tao
The moving object detection is a prerequisite and difficult point in the video tracking system to realize tracking.In order to detect moving object effectively, an object tracking algorithm is proposed based on combining dynamics template matching and Kalman filter. First, make the former two frames inter-difference toThe moving object detection is a prerequisite and difficult point in the video tracking system to realize tracking.In order to detect moving object effectively, an object tracking algorithm is proposed based on combining dynamics template matching and Kalman filter. First, make the former two frames inter-difference to get the area of the moving object and extract the feature points. Then, find the best match with the object model candidate object location by Kalman filter in the search area and match it with the object template of the current frame. Finally, the loss rate of feature points will serve as the limited threshold, and we update template according to dynamic template update strategy. Several experiments of the object tracking show that the approach is accurate and fast, and it has a better robust performance during the posture changing, the size changing and the shelter instance..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 29 (2010)
Structure and Photoelectric Characteristic of Ordered Conducting Polymer Ultra Thin 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. It is shown that better film-processing ability of PEDOT-PSS can be achieved by spreading ODASA mixed monolayer on the PEDOT-PSS sub phase．The Surface of ODA-SA/PEDOT-PSS mixed LB films A Langmuir-Blodgett (LB) inducing method was firstly used to prepare single layer and multilayer conducting composite PEDOT-PSS film. It is shown that better film-processing ability of PEDOT-PSS can be achieved by spreading ODASA mixed monolayer on the PEDOT-PSS sub phase．The Surface of ODA-SA/PEDOT-PSS mixed LB films appears much finer, steady and easy to be controlled with a relatively better ordered structure. Different structures were designed to test the conductive ability of these composite films and a Variable Range Hopping (VRH) model was used to explain the film conductive mechanism. The results indicate that a 3D-VRH model explains well transferring of charge carrier in multilayer film..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 34 (2010)
Design of Tire Roundness Error Detection System
CAI Huai-yu, WANG Zhuang, WANG Wen-tao, FANG Lei, and HUANG Zhan-hua
In order to eliminate the impact of eccentric error and characters of tire surface in tire roundness error detection, an embedded system for measuring tire roundness error based on laser triangulation is designed. The error separation technique of modified reverse method is used to eliminate the eccentric error. AccordIn order to eliminate the impact of eccentric error and characters of tire surface in tire roundness error detection, an embedded system for measuring tire roundness error based on laser triangulation is designed. The error separation technique of modified reverse method is used to eliminate the eccentric error. According to the characters of rubber burr and depression stripe on tire surface, the filtering and fitting algorithm is designed to eliminate adverse effects.The least-square method is used to evaluate the roundness error of tire. Experimental results show that for large and small decorative pattern surface of the radial tire, the system can eliminate the impact of eccentric error and characters of tire surface effectively and complete the tire roundness error detection..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 41 (2010)
The Application of Sampling Moiré Method in Material Deformation Analysis
ZHU Jiang-ping, SU Xian-yu, and XIANG Li-qun
Sampling Moiré method was applied to measure the material deformation accurately. Lodge grating was attached to the surface of the specimen and specimen material with its deformation together, and then different tensile deformation fringe pattern was obtained under defocus by CCD. A deformed fringe pattern was takSampling Moiré method was applied to measure the material deformation accurately. Lodge grating was attached to the surface of the specimen and specimen material with its deformation together, and then different tensile deformation fringe pattern was obtained under defocus by CCD. A deformed fringe pattern was taken out. By using operations such as sampling and bilinear interpolation for the state, multi-frame phase-shifting Moiré maps were acquired.And material displacement and strain distribution were obtained with phase shift method and corresponding formulas.The basic principles of sampling Moiré method were presented, strain displacement formula was derived and experimental results were given. The results show that sampling Moiré method combined with phase-shifting technology is accessible to the material displacement and strain data only using a deformation fringe pattern, which can measure the displacement, strain and other important characteristics analysis with real-time, high accuracy and fast speed. This method is a precise measurement for deformation of the material under dynamic process..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 47 (2010)
Theoretical and Experimental Study for Dual Camera Photogrammetry Algorithm in Photoelectric Guidance System for Helicopter Landing
YANG Cheng, ZHU Da-yong, PENG Zhen-ming, and ZHANG Jing
Based on the positioning technology of beacon photogrammetry, Dual Camera Photogrammetry (DCP) algorithm was proposed in photoelectric guidance system for helicopter landing. Two Charge Coupled Device (CCD) cameras were used to image four beacons on both sides of the helicopter. Target coordinate systems, camera coordiBased on the positioning technology of beacon photogrammetry, Dual Camera Photogrammetry (DCP) algorithm was proposed in photoelectric guidance system for helicopter landing. Two Charge Coupled Device (CCD) cameras were used to image four beacons on both sides of the helicopter. Target coordinate systems, camera coordinate systems and image pixel coordinate systems were established. Based on the colinearity of beacon, lens center and beacon image point, a system of linear equations on rotation matrix and translation vector could be obtained. The position and posture parameters of helicopter relative to the landing point could be solved. A photoelectric guidance experiment system for helicopter landing was designed. In high performance Digital Signal Processor (DSP) system, two channels of image signal were processed in real time. The real time helicopter landing guidance information was calculated with DCP algorithm. The simulation experiments show that in the distance interval from 8 m to 13 m, the distance measurement accuracy can reach ±5 cm and the angle measurement accuracy can reach ±3° in the photoelectric guidance experiment system..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 56 (2010)
Image Quality Evaluation of Grazing Incidence Optical System
LI Shun, GONG Yan, and ZHANG Wei
To completely evaluate the image quality of grazing incidence optical system, based on aberration theory and principle of Fourier optics, an image quality evaluating code for grazing incidence optical system was developed by using Matlab. Then, a detailed image quality analysis of the Wolter type I and hyperboloid-hypeTo completely evaluate the image quality of grazing incidence optical system, based on aberration theory and principle of Fourier optics, an image quality evaluating code for grazing incidence optical system was developed by using Matlab. Then, a detailed image quality analysis of the Wolter type I and hyperboloid-hyperboloid (H-H) grazing incidence optical system for solar observation was presented. The image quality evaluating code could calculate the point spread function, fractional encircled energy, line spread function and modulation transfer function of grazing incidence optical system with different aperture and focal length at different field and wavelength. This code has directive significance to design and optimization of the grazing incidence optical system..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 64 (2010)
Lightweight Design for 2 m SiC Arch Mirror
FAN Lei, YANG Hong-bo, ZHANG Jing-xu, WU Xiao-xia, WANG Fu-guo, and SI Li-na
For a primary mirror with the diameter 2 060 mm in large aperture based-ground telescope, parameters of new arch light-weighted structure are detailedly designed with the material SiC. Meanwhile, radius of supporting rings is also optimized. According to 18-point and 27-point Whiffle tree support scheme, mirror deformaFor a primary mirror with the diameter 2 060 mm in large aperture based-ground telescope, parameters of new arch light-weighted structure are detailedly designed with the material SiC. Meanwhile, radius of supporting rings is also optimized. According to 18-point and 27-point Whiffle tree support scheme, mirror deformation for two models is analyzed and contrasted individually in statics (gravity effect) and thermodynamics. Considering the processing technic of SiC mirror，the 18-point supporting light-weighted structure is judged to be the preferred scheme at last. However,thermal deformation for SiC mirror is sensitive to the steady temperature difference. Referring to this problem, a measure that the supporting-structure design should be suited to the mirror thermal deformation is provided to achieve the design requirements..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 71 (2010)
Measurement of Cryogenic Refractive Index of IR Materials: Uncertainty Analysis
NI Lei, REN Qi-feng, and LIAO Sheng
Based on common measurements of refraction, it is found that the precision of minimum deviation condition is better than that of vertical incidence condition according to our analysis of the sensitivity and uncertainty of them.Analysis shows that for the same deviation and apex angle, the uncertainty of the minimum devBased on common measurements of refraction, it is found that the precision of minimum deviation condition is better than that of vertical incidence condition according to our analysis of the sensitivity and uncertainty of them.Analysis shows that for the same deviation and apex angle, the uncertainty of the minimum deviation method is only 1/2 of the uncertainty of the vertical incidence method. Another factor which would also effects uncertainty is the bandwidth of optical source. From analyzing dispersion of ZnSe by Herzberger dispersion equation, it is found that the dispersion of ZnSe at the wavelength of 5~10 μm is approximately 5×10-4 μm-1. For a given accuracy, the optical source’s bandwidth is less than 20 nm..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 77 (2010)
Mapping-based Complex Contourlet-1.3 Texture Image Retrieval
CHEN Xin-wu, GAO Yue, MA Zhan-qing, and GUO Jian-tao
The ultimate reason of low retrieval rate of contourlet transform texture image retrieval system lies in the coefficients shift sensitive characters and high oscillating in transform domain. In order to overcome the defects of contourlet transform, a mapping-based contourlet-1.3 transform was proposed, and the shift inThe ultimate reason of low retrieval rate of contourlet transform texture image retrieval system lies in the coefficients shift sensitive characters and high oscillating in transform domain. In order to overcome the defects of contourlet transform, a mapping-based contourlet-1.3 transform was proposed, and the shift invariant character was proved. A texture image retrieval system based on the new transform was proposed in which the feature vectors are formed by cascading the energy and standard deviation of each sub-band in the transform domain, and Canberra distance was used as similarity metric. Experimental results show that the image retrieval system is superior to that of the original contourlet transform, contourlet-2.3, mapping-based contourlet transform and mapping-based contourlet-2.3 transform with the same length of feature vectors, retrieval time and memory..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 83 (2010)
A High-speed Serial Transport Platform Based on SRIO for High-resolution Image
[in Chinese], [in Chinese], and [in Chinese]
CCD image usually has a huge amount of data with high-resolution, therefore it is difficult to transport the image data real-timely in real project. In the traditional method, we usually first capture and then transport the image data through parallel interfaces, which possess large area and pins in the resource limiteCCD image usually has a huge amount of data with high-resolution, therefore it is difficult to transport the image data real-timely in real project. In the traditional method, we usually first capture and then transport the image data through parallel interfaces, which possess large area and pins in the resource limited embedded system. We advance a new platform of CCD image capture and transport system based on the Serial RapidIO (SRIO) interface, and the CCD image is displayed immediately at a line speed of 3.125 Gb/s. Since its stability and portability has been tested, the platform can service as a reference model for such real-time and high-resolution image transport system designs..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 89 (2010)
An Improved Fourier-Mellin Algorithm for Video Stabilization
WANG Hong, DAI Ming, LIU Xun, and LI Ming
An improved Fourier-Mellin transform algorithm for video stabilization is presented to enhance the real-time performance, and to solve the problem that motion estimation miscalculates when an image is partially occluded. The computation blocking of estimating scale, rotary and translation in jitter image sequence are aAn improved Fourier-Mellin transform algorithm for video stabilization is presented to enhance the real-time performance, and to solve the problem that motion estimation miscalculates when an image is partially occluded. The computation blocking of estimating scale, rotary and translation in jitter image sequence are analyzed. Then, improve the real Fourier transform by using conjugate symmetry of Fourier transform and access the wi by looking up tables. The computational performance is enhanced effectively. At last, the statistics histogram is used to remove pseudo global motion vector by judging concentration degree. The results show that the real-time performance of video stabilization exceeds the existing one 42% when processing 512 pixels×512 pixels gray image sequence, meet real-time requirements.It can efficiently remove estimation miscalculations because of image occluded partially, and further enhance the robustness..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 93 (2010)
The Detection of Advertisement Based on Content in Streaming Media
WANG Hong-xia
With the development of the digital technology, television station and information service providers depend more and more on the video detection technology. The principle of the detection of the video advertisement is described based on the following content: shot boundary detection and frame matching. And the key techWith the development of the digital technology, television station and information service providers depend more and more on the video detection technology. The principle of the detection of the video advertisement is described based on the following content: shot boundary detection and frame matching. And the key technologies are compared, and the technology suitable for the advertisement detection system is found. By studying the current advertisement detection system, we put forward a modified method to improve the advertisements detection performance. Through many tests on different TV program, the results show that the modified system is effective..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 99 (2010)
Iris Recognition Based on Regional Grayscale Change
ZHOU Xiao, SHEN Jian-xin, LIAO Wen-he, and YE Yong-qiang
In order to improve the accuracy and the identification speed of iris recognition, an iris recognition method is presented based on regional grayscale changes. Firstly，the normalized iris images are obtained by preprocessing eye images. Then, images are smoothed by an elliptical 2D-Gaussian filter which is constructed In order to improve the accuracy and the identification speed of iris recognition, an iris recognition method is presented based on regional grayscale changes. Firstly，the normalized iris images are obtained by preprocessing eye images. Then, images are smoothed by an elliptical 2D-Gaussian filter which is constructed adaptive to the differences of iris characteristic scales, and code them by ordinal measure for regional grayscale changes between two sampling points.Finally, the Hamming distance is calculated between two iris codes and the recognition result is obtained according to that．Experimented on Bath and CASIA iris database, the proposed method has decreased the equal error rate to 0.05% and 0.69%. The results demonstrate that the proposed method has a high accuracy and fast identification speed..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 104 (2010)
Stress Analysis of Compression Molding of Aspherical Glass Lenses Using Finite Element Method
YIN Shao-hui, JIN Song, ZHU Ke-jun, CHEN Feng-jun, and YU Jian-wu
Accurate data of the internal residual stress can not be obtained in the process of compression molding of aspherical glass lenses, so finite element method was presented to analyze inner stresshistory and predict residual stress distribution. According to the nature of glass at high temperatures which is similar to viAccurate data of the internal residual stress can not be obtained in the process of compression molding of aspherical glass lenses, so finite element method was presented to analyze inner stresshistory and predict residual stress distribution. According to the nature of glass at high temperatures which is similar to viscoelastic material, the creep response of 5-pairs general Maxwell model is incorporated into the finite element numerical calculation. Using advanced nonlinear finite element program of MSC.Marc, uniaxial compression of cylindrical glass and compression molding of aspherical glass lenses were simulated. Residual stress distribution in lenses compressed is obtained. On the basis of above mentioned, the effect of temperature and molding velocity on residual stress distribution in lenses was importantly analyzed. The experimental result shows that maximum residual stress occurs at the edge of the lens, and lower temperature and higher molding speed will increase the maximum residual stress..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 111 (2010)
The Mistake during the Process of Testing Aspheric Mirror Using Compensator
MING Ming, YANG Fei, CHEN Bao-gang, LI Jian-feng, and LIN Xu-dong
The method of compensator, a common and important means, which could test figure error of aspheric mirror, is applied more frequently at home and abroad. And alignment of every optical element could introduce primary aberrations, which will influence the final test result. This paper expatiated the test process with coThe method of compensator, a common and important means, which could test figure error of aspheric mirror, is applied more frequently at home and abroad. And alignment of every optical element could introduce primary aberrations, which will influence the final test result. This paper expatiated the test process with compensator, which gave an illustration of 1 meter aspheric mirror, and analyzed some corresponding primary aberrations that were brought by alignment, and enumerated the mistake of test process. Then, corresponding method of judging and elimination was educed. Finally, according to the comparison of the figure error test ofФ 300mm, Ф300 mm andФ1m aspheric, it was proved that the mistake would distort the result of measurement, which validated the reliability of the method of judging and elimination. And with the correct method, the figure error of final test result is 0.038λ..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 116 (2010)
Quantitative Model of Alcohol and Acid in Chinese Rice Wine Based on Near-infrared Transmission Spectroscopy
HU Xiao-bang, Lü Jin, LIU Hui-jun, SHI Yang, LIU Tie-bing, and LI Bo-bin
The quantitative models for alcohol and acid of Chinese rice wine were established by Near-infrared (NIR) transmission spectroscopy combined with Successive Projection Algorithm (SPA). Considering the influence of different kinds of wine, the optimal modeling method of alcohol and acid was developed by comparing the clThe quantitative models for alcohol and acid of Chinese rice wine were established by Near-infrared (NIR) transmission spectroscopy combined with Successive Projection Algorithm (SPA). Considering the influence of different kinds of wine, the optimal modeling method of alcohol and acid was developed by comparing the classification and mixed models for dry and semi-dry wine. SPA-PLS model was established by optimizing wavelengths on the range of 800~2500nm, which was better than full-spectrum PLS model. The correlation coefficient (R) of the model for acid,alcohol in dry wine and alcohol in semi-dry wine were 0.943, 0.983 and 0.993, respectively, and the Root Mean Square Errors of Cross Validation (RMSECV) were 0.258, 0.174 and 0.189, accordingly. The result indicated that the classification modeling significantly increased the precision of alcohol model, and the acid model has been improved by mixed modeling. SPA made the analysis model simple, and promoted the precision and stability. The result provides aneffective way of building robust quantitative model in Chinese rice wine, and can be applied in on-line wines’ quality testing..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 122 (2010)
Scanning Control System of a Simple Structure Step Framing Aerial Camera
ZHOU Li, YANG Shi-hong, and GAO Xiao-dong
Step framing is an important method to enlarge the covered working area of a traditional array CCD aerial camera. A simple structure step framing aerial camera is presented. By adopting open-loop control of a stepper motor to achieve the scanning process, the camera is especially suited for occasions that the volume anStep framing is an important method to enlarge the covered working area of a traditional array CCD aerial camera. A simple structure step framing aerial camera is presented. By adopting open-loop control of a stepper motor to achieve the scanning process, the camera is especially suited for occasions that the volume and weight is strictly limited.The design of a high-order smooth motion curve of a stepper motor based on versine functions and its implementation on the Digital Signal Processor (DSP) are introduced in detail. The experiment indicates that the control strategy effectively restrains the impulsion and residual vibration and the out-of-step conditions of the stepper motor are avoided. The repetitive positioning accuracy is better than 10”. The system meets the requirements of the step framing camera with simple structure and low cost..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 128 (2010)
Portable UV GaN Camera and Its Preliminary Validation of Marine Application
QIAN Wei-feng, YIN Da-yi, TAO Bang-yi, ZHAN Yuan-zeng, HUANG Xiao-xian, HUANG Xing, and LI Yu-min
It was analyzed that the principle and characteristics of a GaN-based Ultraviolet (UV) detector developed recently by Chinese, and that the principle and method of the information acquisition technology for the detector is achieved. It was described that the design process of portable UV camera with the GaN-based UV deIt was analyzed that the principle and characteristics of a GaN-based Ultraviolet (UV) detector developed recently by Chinese, and that the principle and method of the information acquisition technology for the detector is achieved. It was described that the design process of portable UV camera with the GaN-based UV detector. The Signal-to-Noise Ratio (SNR) of the camera and the outdoor experiment were finished. Through the cooperation with the Marine-related institute, the portable camera was mounted on the research vessel and the UV image of the sea surface was successfully acquired. The results show that the image of the sea surface is clear and rich texture, which made a maiden attempt and explorations of UV remote sensing detections to the marine oil spill..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 134 (2010)
Non-linear Decoupling between the Frameworks of Infrared Sight Axis Stabilization System
ZHAO Yan-hua, ZHANG Wei-min, and ZHOU Yang
Infrared sight axis stability framework is a three-degree-of-freedom frame structure. When the frames are in non-orthogonal positions, there will be a coupling phenomenon. This phenomenon will affect the stability accuracy of the system. The system of framework is modeled based on its kinetic equation, and it is pointeInfrared sight axis stability framework is a three-degree-of-freedom frame structure. When the frames are in non-orthogonal positions, there will be a coupling phenomenon. This phenomenon will affect the stability accuracy of the system. The system of framework is modeled based on its kinetic equation, and it is pointed out that there is a complex non-linear coupling between the frameworks, and these disadvantages will produce a negative impact on the design of sight axis stabilization control system. Then it is proved that the system can be decoupled by the theorem in non-linear decoupling control system. The differential geometry method is used for decoupling the frameworks system. Experimental results show that this method can reduce the coupling impact between the frameworks when the framework of infrared sight axis stabilization system is in a non-orthogonal position, solve the problem that coupling movement makes the picture unstable, and improve the stability and reliability of system..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 139 (2010)
Volumetric Three-dimensional Display System Based on DMD and a Spinning Helical Screen
PAN Wen-ping, SHEN Chun-lin, LI Li, XING Jian-fang, and FAN Qiong-jian
A novel volumetric 3D display system is presented. A series of helical slices of a 3D model is projected onto a spinning helical screen through a Digital Micro-mirror Device (DMD) as a fast Space Light Modulator (SLM). Due to the persistence of vision, human observers are able to perceive a true 3D volumetric image witA novel volumetric 3D display system is presented. A series of helical slices of a 3D model is projected onto a spinning helical screen through a Digital Micro-mirror Device (DMD) as a fast Space Light Modulator (SLM). Due to the persistence of vision, human observers are able to perceive a true 3D volumetric image with physical depth cue by fusing together the successive helical slices into a 3D image. We emphasize the method for constructing a true 3D space using a spinning helical screen, analyze the volexlization approach based on Body-center Cubic (BCC) strategy, and design an algorithm to control DMD for projecting binary slices. Experimental results demonstrate that, a data reduction more than 40% is achieved by utilizing BCC sampling strategy, and the prototype is capable of displaying more complicated objects using DMD with μs-leveled response time, compared with the mirror-laser scheme. Objects can be displayed with true three dimensions and a fresh rate of 16 Hz in a half-cylinder display space with a diameter of 500 mm and a height of 250mm, and can be viewed from almost any angle without any special viewing aids..
Opto-Electronic Engineering
- Publication Date: Oct. 09, 2021
- Vol. 37, Issue 10, 144 (2010)
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