Journals >Electro-Optic Technology Application
Contents
2011
Volume: 26 Issue 1
21 Article(s)
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Research Article
Uncooled Infrared Focal Plane Temperature Control System Based on ADN8830
ZHANG Xiao-peng, and GUO Jing-wei
In the electro-optic field, many devices require the temperature stabilization. Uncooled infrared focal plane (UIFP) which does not need the cooling system has a good prospect. In order to ensure the temperature stabilization of each sensitive element on the focal plane, a high performance and accuracy temperature contIn the electro-optic field, many devices require the temperature stabilization. Uncooled infrared focal plane (UIFP) which does not need the cooling system has a good prospect. In order to ensure the temperature stabilization of each sensitive element on the focal plane, a high performance and accuracy temperature control system is designed. The theory of thermo-electric cooler (TEC) using Seebeck effect is introduced, and the design of temperature control circuit based on ADN8830 is discussed. The experimental results show that the temperature control system fully meets the requirements of the temperature stabilization of each sensitive element on the focal plane..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 1 (2011)
Design of Maritime Targets Tracking System Based on Mean-Shift Algorithm
LI Jin-liang, GAO Wen-jing, and WANG Lei
In order to improve the accurate identification and stable tracking of maritime targets, by analyzing the tracking principles and algorithm of Mean-shift, a design method of maritime targets tracking system based on Mean-Shift algorithm is proposed. By tracking maritime and ground targets show that the design can effecIn order to improve the accurate identification and stable tracking of maritime targets, by analyzing the tracking principles and algorithm of Mean-shift, a design method of maritime targets tracking system based on Mean-Shift algorithm is proposed. By tracking maritime and ground targets show that the design can effectively eliminate the background interference, such as ocean waves scatting, and also achieve stable tracking, so the design is reasonable and feasible..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 5 (2011)
Design of Laser Beam Z-Scan System Based on Labview
BI Xiang-li, ZHAO Wan-li, and ZHANG Xiao-guang
Laser Z-scan technology is a favorable method to study the properties of nonlinear optical materials. The principles of laser Z-scan technology and the compositions of Z-scan experiment system are introduced. According to the features with plenty of data and high stability, the laser beam Z-scan system based on LabviewLaser Z-scan technology is a favorable method to study the properties of nonlinear optical materials. The principles of laser Z-scan technology and the compositions of Z-scan experiment system are introduced. According to the features with plenty of data and high stability, the laser beam Z-scan system based on Labview is developed. The laser beam Z-scan experiment can be automatically controlled by the system, and the experimental data can be stored and processed. The results show that the system can greatly increase the test efficiency and stability..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 8 (2011)
2 kHz Repetition-rate Compact TEA CO2 Laser
ZHENG Yi-jun, WANG Xu, TAN Rong-qing, WANG Dong-lei, ZHANG Kuo-hai, and LIU Shi-ming
A compact transversely excited atmosphere(TEA)CO2 laser with high repetition-rate is reported. The ultraviolet pre-ionization makes the discharge even and stable. The output energy is 15 mJ and the output pulse width is 60 ns under the free oscillation. The turbocharger technology is applied in the high speed gas circuA compact transversely excited atmosphere(TEA)CO2 laser with high repetition-rate is reported. The ultraviolet pre-ionization makes the discharge even and stable. The output energy is 15 mJ and the output pulse width is 60 ns under the free oscillation. The turbocharger technology is applied in the high speed gas circulation system, the highest wind velocity is over 100 m/s, the repetition rate of the TEA CO2 laser is 2 kHz..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 12 (2011)
Influence of Thermal Lens Effect on Output of Solid State Laser
CAI Jun, ZHANG Xiao-juan, and XU Tao
The solid state laser resonance cavity with thermal lens is analyzed, the G parameters of resonance cavity are obtained, changing G parameters with the pumped power are analyzed and discussed, and the changes of output power of the different cavity are presented. By studying the Tm:YAP laser, the changes of output poweThe solid state laser resonance cavity with thermal lens is analyzed, the G parameters of resonance cavity are obtained, changing G parameters with the pumped power are analyzed and discussed, and the changes of output power of the different cavity are presented. By studying the Tm:YAP laser, the changes of output power of different cavity are validated by the experimental results. To the plane-plane cavity solid state laser, a conclusion that short cavity is appropriate for high power output is obtained..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 15 (2011)
Generation and Characteristic of White Light Laser
CHEN Ya-nan, GAO Peng, and YANG Guang-da
By analyzing the effect of laser in transparent media, the femtosecond laser pulses transmitting through transparent media can produce many nonlinear effects, which greatly expands the laser pulse frequency spectrum and produce the white light radiation. The spectrum characteristic of white light radiation and cone angBy analyzing the effect of laser in transparent media, the femtosecond laser pulses transmitting through transparent media can produce many nonlinear effects, which greatly expands the laser pulse frequency spectrum and produce the white light radiation. The spectrum characteristic of white light radiation and cone angle radiation are discussed. The above analysis and discussion of experiments show that the white light spot appears on the receiving screen, and white light spectrum covers from visible to near infrared bands with good coherence, when laser power reaches a certain value and laser transmits through the solid transparent media, such as quartz glass..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 18 (2011)
Shaping Transformation of Micro-Circular Aperture Diffraction of Gaussian Beam
CHANG Shan, XIAO QING-wu, HE Jie, WANG Hua, and WU Zhi-wei
In the practical application of laser, the beam shaping is often needed to better meet the actual needs, for this purpose, firstly the analytical formula for diffraction transformation of Gaussian beam through micro-circular aperture is derived from the Kirchhoff diffraction formula, then three kinds of shaping transfoIn the practical application of laser, the beam shaping is often needed to better meet the actual needs, for this purpose, firstly the analytical formula for diffraction transformation of Gaussian beam through micro-circular aperture is derived from the Kirchhoff diffraction formula, then three kinds of shaping transformations of Gaussian beam through micro-circular aperture are analyzed and discussed, the three cases of shaping transformations of Gaussian beam through micro-circular aperture are simulated with the Mtalab software. The simulation experiment shows that the analytical formula is reliable and the three kinds of shaping transformations of Gaussian beam through micro-circular aperture circular are feasible, which can be used in the laser beam control of laser engineering, micro-optics and MOEMS (Micro-Optical-Electrical-Mechanica-System)..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 20 (2011)
Paraxial Propagation Properties of Hollow Gaussian Beams
LIU Shan-shan, LIU Shuang-feng, and ZHANG Lei-lei
A propagation model for hollow Gaussian beams (HGBs) through the paraxial optical system is derived, the propagation properties of HGBs in free space are analyzed using the derived propagation formula, and the propagation equation is simulated by using Matlab software. The results show that the ordern and propagation dA propagation model for hollow Gaussian beams (HGBs) through the paraxial optical system is derived, the propagation properties of HGBs in free space are analyzed using the derived propagation formula, and the propagation equation is simulated by using Matlab software. The results show that the ordern and propagation distancez are the importance parameters for controlling hollow beams. With the increase of ordern , Gaussian beams are gradually become HGBs, and the center of dark and bright radius of the bright ring are correspondingly increased. With the increase of propagation distancez , HGBs are divergent, and black spot area is reduced in the ratio of the total spot area, but in the far-field the black spot is disappeared, and light intensity becomes the maximum on the axis..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 24 (2011)
Information Processing of Lidar Echo for Obscure Target
HUANG Tao, and HU Yi-hua
In order to detect the obscure target by using lidar (light detection and ranging), the influence of obscure target on lidar echo waveform is studied, and its simulation data are obtained. Fitting the nonlinear waveforms by using Levenberg-Marguardt algorithm, which break down waveforms into a series of Gaussian componIn order to detect the obscure target by using lidar (light detection and ranging), the influence of obscure target on lidar echo waveform is studied, and its simulation data are obtained. Fitting the nonlinear waveforms by using Levenberg-Marguardt algorithm, which break down waveforms into a series of Gaussian components, and obtain the number, position, half-width and amplitude of each Gaussian component. Echo components of sub-target in different channels are obtained via time matching of separate sub-echoes respectively; the ratio of reflectivity and depolarization degree are obtained via amplitude of waveform component, which can achieve the characteristic extraction of various targets..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 27 (2011)
Influences of Focal Shift and Detection Beam Parameters on Cat-eye Echo
ZHANG Chuang-xin, and SUN Xiao-quan
The influences of the optical system focal shift and the detection laser beam parameters on the echo of cat-eye optical system are studied. By numerical simulation and experiment, the relationships of cat-eye echo, focal shift and detection beam parameters are analyzed. A preliminary scheme of echo enhancement is propoThe influences of the optical system focal shift and the detection laser beam parameters on the echo of cat-eye optical system are studied. By numerical simulation and experiment, the relationships of cat-eye echo, focal shift and detection beam parameters are analyzed. A preliminary scheme of echo enhancement is proposed, by changing the detection laser beam parameters..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 31 (2011)
Effect of Atmosphere Scattering on Echo Signal SNR of SAL
LV Xu-guang, YAN Fei, and HAO Shi-qi
The echo signal power is the important factor that limits detection resolution. Combining the impact of atmosphere scattering on laser transmission, the atmosphere scattering attenuation model of laser with the wavelength from 200 to 1200 nm through the atmosphere is built, and the model is simulated and analyzed. The The echo signal power is the important factor that limits detection resolution. Combining the impact of atmosphere scattering on laser transmission, the atmosphere scattering attenuation model of laser with the wavelength from 200 to 1200 nm through the atmosphere is built, and the model is simulated and analyzed. The laws for the impact of atmosphere scattering on laser attenuation and echo signal SNR (signal noise ratio) are obtained..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 36 (2011)
Infrared Optical Thin Film Technology
WANG Bi-yi, LI Jian-feng, LIU Xin, and ZHANG Xiao-guang
The effect of infrared optical thin films in infrared optical system is introduced. The selection of optical materials，coating materials and the design methods of infrared antireflective and protective thin film are explained. In addition, some film materials such as DLC, GexC1-x , Gap and diamond are described, includThe effect of infrared optical thin films in infrared optical system is introduced. The selection of optical materials，coating materials and the design methods of infrared antireflective and protective thin film are explained. In addition, some film materials such as DLC, GexC1-x , Gap and diamond are described, including their properties and applications. Finally, the future development of infrared antireflective and protective thin film is prospected..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 40 (2011)
Algorithm for Effective Permittivity of Composite Materials Using Equivalent Capacitance
TANG Hou-chao, LV Xu-liang, WU Chao, and JIA Qi
Classic theory is not suitable for the calculation of composite materials with high duty factor, an algorithm of the effective permittivity of composite materials using the equivalent capacitance is presented. The packing mediums in the capacitor are the particle dispersion type composite materials. By solving the equiClassic theory is not suitable for the calculation of composite materials with high duty factor, an algorithm of the effective permittivity of composite materials using the equivalent capacitance is presented. The packing mediums in the capacitor are the particle dispersion type composite materials. By solving the equivalent capacitance of the capacitor, the formulas of effective permittivity are derived. By comparing the model with MG model and EMA model, the results are very similar, so this algorithm is correct and adaptable，the results are matched with the experimental values given in the literatures under the case of high duty factor..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 44 (2011)
Depth Estimation Methods Based on Computer Vision
JIANG Jing, and ZHANG Xue-song
The depth estimation methods can be divided into two categories, active vision and passive vision. The five different passive vision range finding methods are introduced, including stereo vision, structure from motion, shape from shading, depth from focus and depth from defocus, and their imaging principles, mathematicThe depth estimation methods can be divided into two categories, active vision and passive vision. The five different passive vision range finding methods are introduced, including stereo vision, structure from motion, shape from shading, depth from focus and depth from defocus, and their imaging principles, mathematical models and measurement methods are also analyzed. Finally, the depth estimation methods based on computer vision are summarized, and the limitation of the current measurement methods is analyzed. The further direction of improvement algorithm is using the different modules in the computer vision system. The association depends on combining the different weighting factors in the actual environment with passive depth estimation methods. This is a hot point in the present computer vision..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 51 (2011)
A Rapid Edge Detection Method for Aerial Image
WANG Zhong-xian, SHI Jian-jun, and ZHANG Zheng-wu
Aerial image edge detection is an important assistant work of images interpretation. The main characteristics of aerial images and the basic theory of mathematics morphology are analyzed, then a new compound mathematics morphology in edge detection is introduced. Through the simulation experiments on the real aerial imAerial image edge detection is an important assistant work of images interpretation. The main characteristics of aerial images and the basic theory of mathematics morphology are analyzed, then a new compound mathematics morphology in edge detection is introduced. Through the simulation experiments on the real aerial image, the results show that the compound mathematics morphology algorithm has better results and less running time than the traditional algorithms..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 56 (2011)
GPU Accelerated Computation for Affine Transformation of Complex Mesh Model
ZHONG Qing, and HUA Shun-gang
The affine transformation of complex mesh model is implemented on the programmable GPU in order to speed up the calculation process. Based on the characteristics of parallel computing, each thread calculates the weight of the k-nearest neighbor and the transformed coordinate for one node, as well as multithreads run atThe affine transformation of complex mesh model is implemented on the programmable GPU in order to speed up the calculation process. Based on the characteristics of parallel computing, each thread calculates the weight of the k-nearest neighbor and the transformed coordinate for one node, as well as multithreads run at the same time. By arranging the thread hierarchy and distributing the device memory reasonably, the parallel operation capability of GPU is brought into full play. And the experimental result shows GPU executes the affine transformation of massive mesh model with a significantly accelerated effect..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 59 (2011)
Denoising Analysis of Terahertz Spectra of Explosives Based on Wavelet Transform
YAO Bao-dai, and WANG Gao
The terahertz absorption spectra of the insensitive explosives RDX and HMX in the spectral range from 0 to 2.5 THz are detected with terahertz time-domain spectroscopy. The terahertz absorption spectra and the characteristic absorption peak of test samples are obtained, and comparing with the absorption spectra measureThe terahertz absorption spectra of the insensitive explosives RDX and HMX in the spectral range from 0 to 2.5 THz are detected with terahertz time-domain spectroscopy. The terahertz absorption spectra and the characteristic absorption peak of test samples are obtained, and comparing with the absorption spectra measured by other research institutions. The results show that the absorption spectra measured in air environment have strong oscillation due to the absorption of water vapor. So the data measured in the air environment are processed with the wavelet transform to eliminate the influence of water vapor, and this method is feasible..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 63 (2011)
Parallel Acquisition and Control of High Speed and Intensive Multi-Channel Optical Signals
ZHANG Bin, ZHAO Dong-e, SONG Tao, and LUO Qian-qian
Aiming at the lack of I/O numbers of the controller in laser screen coordinates measurement, the parallel acquisition and control of high speed and intensive multi-channel optical signals are implemented, by combining field programmable gate array (FPGA) devices with MCU (Micro-Controller Unit). FPGA is used as acquisiAiming at the lack of I/O numbers of the controller in laser screen coordinates measurement, the parallel acquisition and control of high speed and intensive multi-channel optical signals are implemented, by combining field programmable gate array (FPGA) devices with MCU (Micro-Controller Unit). FPGA is used as acquisition and storage devices of a photoelectric switch signal data, MCU controls FPGA, processes and displays the data. After a test for the target coordinate of 7.62 mm projectile, the result proves that the system based on FPGA and MCU to implement parallel acquisition and control of high speed and intensive multi-channel optical signals solves the shortcomings of I/O shortages and low processing speed of traditional coordinates target. The system has the advantages of fast response, high sensitivity and split joint..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 66 (2011)
Design of Linux USB Driver Based on FT245
ZENG Qiang, ZHAO Juan, WEI Lin, and WANG Wen-lian
The advantages of Linux operating system are open source, stabilization and easy to port in the embedded devices, so the actual project needs to design USB driver for devices with the embedded Linux system. In order to solve Linux USB driver supporting arm, the data structure of USB driver is analyzed, and the frame prThe advantages of Linux operating system are open source, stabilization and easy to port in the embedded devices, so the actual project needs to design USB driver for devices with the embedded Linux system. In order to solve Linux USB driver supporting arm, the data structure of USB driver is analyzed, and the frame programs of USB driver are modified. The driver loading to FT245 USB chip is realized by using compile module method, USB driver design based on arm＋Linux platform is completed, and the design successfully applies in the specific test system. Finally, the correctness of design is verified by experiments..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 70 (2011)
Three Different Luminance Components of Color Space Applying in Camouflage Effectiveness Evaluation
HUANG Yan-hua, WU Wen-yuan, GONG Yan-chun, and GUO Jian-ming
Basing on the regulations of camouflage effectiveness evaluation and the Chinese color system, the database of 64-level luminance components of CIE1976L * a * b *, LMS and lαβ color space is established, and using the histogram similarity of gray degree, the applications of above three luminance components in camouflagBasing on the regulations of camouflage effectiveness evaluation and the Chinese color system, the database of 64-level luminance components of CIE1976L * a * b *, LMS and lαβ color space is established, and using the histogram similarity of gray degree, the applications of above three luminance components in camouflage effectiveness evaluation are analyzed. The results show that L * component has the good uniformity, Lm component and l component are consistent with the interpretation results of human eye, respectively in the lower and the higher gray level..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 74 (2011)
Study and Experiment on Sensitivity Calibration of Sky Screen Target
DU Wen-bin, and FAN Jun-qi
The detection sensitivity is an important performance index for sky screen target. Working principle and sensitivity mechanism of the sky screen target are analyzed. The relation formula of optical lens parameters, measured bullet length and sensitivity are given, a method to use the small caliber bullet to determine tThe detection sensitivity is an important performance index for sky screen target. Working principle and sensitivity mechanism of the sky screen target are analyzed. The relation formula of optical lens parameters, measured bullet length and sensitivity are given, a method to use the small caliber bullet to determine the sensitivity is presented, and the modified formula of caliber bullet is derived. The air gun bullet experimental tests verify that the calibration method is feasible, and the given caliber bullet has a guidance significance in application..
Electro-Optic Technology Application
- Publication Date: Oct. 09, 2021
- Vol. 26, Issue 1, 78 (2011)
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