Journals >Electro-Optic Technology Application
Contents
2014
Volume: 29 Issue 6
21 Article(s)
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Research Article
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 1 (2014)
Design of Long Focal Length Aviation Camera Optical System
WANG Yu, MU Da, LI Jing-fang, and ZHANG Li-li
Aviation camera is a kind of airborne optical instrument,which acquire the targets on ground through shooting ground sceneries. For meeting the requirements of long range shooting,long focal length object lens is needed to obtain bigger size images of the objects far away in image plane. A long focal length aviation caAviation camera is a kind of airborne optical instrument,which acquire the targets on ground through shooting ground sceneries. For meeting the requirements of long range shooting,long focal length object lens is needed to obtain bigger size images of the objects far away in image plane. A long focal length aviation camera optical system is designed at focal length 550 mm,F number 6 with field 2ω=9°. Double Gauss object lens is selected as an initial structure in the design of the object lens of the long focal length aviation camera. The system is optimized by ZEMAX to improve image quality. The optimized system is standardized and performed tolerance analysis to obtain the needed optical system. The system has good image quality under 80 pairs per millimeter spatial frequency and MTF is more than 0.15..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 1 (2014)
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 1 (2014)
Development and Application of Optical Fiber Sensing Technology
DU Zhi-quan, NI Feng, and XIAO Fa-xin
With the development of optical fiber sensing technology,fiber sensors are researched and applied in various fields. Firstly,the structures and classifications of optical fiber,the operation principles,classifications and the characteristics of fiber sensors as well as optical fiber bending loss are introduced. And theWith the development of optical fiber sensing technology,fiber sensors are researched and applied in various fields. Firstly,the structures and classifications of optical fiber,the operation principles,classifications and the characteristics of fiber sensors as well as optical fiber bending loss are introduced. And then,the development and application of optical sensing technology in various fields are introduced. At last,the development of optical fiber sensing technology is forecasted further..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 7 (2014)
Design of Electro-optical Information Control Simulation System Based on BOM
FAN Yong-jin, and WU Gang
The template framework and correlation of base object model (BOM) are introduced. According to BOM development standard,hierarchical simulation framework and model design of an electro-optical information control system is designed. The methods for building the model are described. Based on BOM,high level architecture The template framework and correlation of base object model (BOM) are introduced. According to BOM development standard,hierarchical simulation framework and model design of an electro-optical information control system is designed. The methods for building the model are described. Based on BOM,high level architecture (HLA) electro-optical information control simulation system is constructed. And the development steps and implement processes of the system are introduced. The efficiency of the system and model reusing are improved effectively,which provide advantaged technology support for high efficiency development of electro-optical information control simulation system in the future..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 13 (2014)
Research on Electro-optical Characteristic of Vehicle-mounted Negative CLCD
HUANG Chong, XU Guo-dong, YANG Wei-feng, OUYANG Yan-dong, and WU Yong-jun
Under the same driving voltage,the colorful liquid crystal display device (CLCD) has quite different electro-optical characteristics at different wavelength. As a result,the saturation of colorful display image could be greatly influenced. The electro-optical characteristics of negative TN-LCD,STN-LCD and VA-LCD drivenUnder the same driving voltage,the colorful liquid crystal display device (CLCD) has quite different electro-optical characteristics at different wavelength. As a result,the saturation of colorful display image could be greatly influenced. The electro-optical characteristics of negative TN-LCD,STN-LCD and VA-LCD driven by different voltage are measured by UV-Vis8500 double beam ultraviolet (UV)/visible spectrophotometer,from which the electro-optical and threshold characteristics of three primary colors and the gradient variation with wavelength are analyzed and compared. The results show that with the increasing of wavelength,Vth,Vsat and V50 of TN-LCD decrease. And the decreasing speed of them is basically same. With the increasing of wavelength,Vth,Vsat and V50 of STN-LCD decrease. And the decreasing speed of them is different in each wavelength. With the increasing of wavelength,Vth,Vsat and V50 of VA-LCD increase gradually. But the increasing speed of Vsat is faster than that of V50 and the increasing speed of V50 is faster than that of Vth. The chosen driving voltages of three commonly used different negative liquid crystal display devices are compared and analyzed. The results can provide certain guidance for choosing the driving voltage of colorful liquid crystal display (CLCD)..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 18 (2014)
Research on Mode-coupled and Crosstalk Characteristic of Hole-Assisted Six-core Fiber
WEN Ming-yan, ZHENG Si-wen, LIN Zhen, and REN Guo-bin
Based on mode-coupled theory,the coupling characteristics of hole-assisted six-core fiber are researched systematically. The effect of nonadjacent fiber core on mutual coupled and self-coupled parameters is especially considered. And the influence on coupled parameter,crosstalk and mode area from the changing of fiber Based on mode-coupled theory,the coupling characteristics of hole-assisted six-core fiber are researched systematically. The effect of nonadjacent fiber core on mutual coupled and self-coupled parameters is especially considered. And the influence on coupled parameter,crosstalk and mode area from the changing of fiber structure parameters is analyzed. Research results show that coupled effects among fiber core can be reduced effectively by making the best of fiber cross section through adjusting the structure parameters of fiber. Under the condition of keeping low crosstalk,larger single core effective area can be achieved..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 23 (2014)
Experimental Research on Structure Photonic Lattice in Double Doped Mg:Fe:LN Crystal
LI Qiang, YANG Li-sen, SHI Hui-yuan, WU Yi-jie, and WANG Long-fei
For improving the diffraction efficiency of photonic lattice and shortening lattice writing time,a 488 nm semiconductor laser and a 532 nm Nd:YAG solid laser are respectively used to write one-dimensional photonic lattice in double doped Mg:Fe:LN and Fe:LN crystal with the same doped Fe concentration. The relationship For improving the diffraction efficiency of photonic lattice and shortening lattice writing time,a 488 nm semiconductor laser and a 532 nm Nd:YAG solid laser are respectively used to write one-dimensional photonic lattice in double doped Mg:Fe:LN and Fe:LN crystal with the same doped Fe concentration. The relationship between the maximum diffraction efficiency and time of the photonic lattice in the crystal is compared and researched. Experimental results show that the photonic lattice writing time in double doped Mg:Fe:LN crystal is shorter than that of Fe:LN crytal and the diffraction efficiency is higher than that of Fe:LN crystal..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 29 (2014)
Research on Multi-wavelength Filter Based on Chirped Phase-shifted Fiber Bragg Grating
XIONG Hai, PEI Li, LIU Chao, WU Liang-ying, and MENG Xiao-ting
V-I transfer matrix method is used to analyze phase-shifting,phase-shifted point position and the influence on phase-shifted fiber Bragg grating (FBG) transmission spectrum characteristic from chirped coefficient. The wavelength spacing of the multi-notch filter generated by inserting multiple phase shifts into the chiV-I transfer matrix method is used to analyze phase-shifting,phase-shifted point position and the influence on phase-shifted fiber Bragg grating (FBG) transmission spectrum characteristic from chirped coefficient. The wavelength spacing of the multi-notch filter generated by inserting multiple phase shifts into the chirped FBG is analyzed. It is similar to the wavelength shifting spacing of the notch filter,which inserts single phase shifting at the same position. According to simulation results,chirped phase-shifted grating shifting number,position interval,chirped coefficient and phase-shifting can be chosen optimally to design the applicable multi-wavelength filter..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 32 (2014)
Research on Optical Limiting Effect Based on C60 Polymer
ZHAO Wan-li, and WANG Bi-yi
The research development of C60 material in optical limiting area is introduced. Polystyrene C60 polymer is prepared through hybridization synthesis method,and the characteristics of the composition sample are analyzed,which has homogeneous distribution characteristic. The non-linear characteristic of the material is tThe research development of C60 material in optical limiting area is introduced. Polystyrene C60 polymer is prepared through hybridization synthesis method,and the characteristics of the composition sample are analyzed,which has homogeneous distribution characteristic. The non-linear characteristic of the material is tested and analyzed through Z-scan experiment. The results show that the material has good non-linear limiting effect at higher linear transmissivity,which has important value for developing laser protection devices with good characteristics..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 36 (2014)
Image Enhancement Method Based on Wavelet Transform
SONG Qing-feng, LV Xu-liang, SUI Ming-xu, and LU Ai-jun
According to the characteristics of some gray images such as low resolution and contrast,high noise and poor visual characteristics,a new image enhancement method based on wavelet transform and histogram equalization is proposed. The characteristics of wavelet transform such as multi-scale and multi-resolution are incoAccording to the characteristics of some gray images such as low resolution and contrast,high noise and poor visual characteristics,a new image enhancement method based on wavelet transform and histogram equalization is proposed. The characteristics of wavelet transform such as multi-scale and multi-resolution are incorporated with histogram equalization method in the method,and assisted with median filter de-noising and homomorphism filtering enhancement. So the shortcomings such as image detail loss with single histogram equalization image enhancement method and enhancement image noise are overcome. Experimental results show that the method has better effect for image resolution and contrast enhancement..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 39 (2014)
Research on Spatial Resolution Based on BOTDA Sensing Technology
JIA Zhen-an, XU Cheng, LIU Ying-gang, and WEI Ting
Spatial resolution is an important parameter of Brillouin optical time domain analysis (BOTDA) sensing system,which depends on the width of pump pulse light. To improve the spatial resolution of BOTDA system,spiral coiled optical fiber method is used without changing the width of pump pulse light. Brillouin scatter senSpatial resolution is an important parameter of Brillouin optical time domain analysis (BOTDA) sensing system,which depends on the width of pump pulse light. To improve the spatial resolution of BOTDA system,spiral coiled optical fiber method is used without changing the width of pump pulse light. Brillouin scatter sensing principle is analyzed. The influence on improving spatial resolution in actual measurement process using coiled optical fiber is analyzed on theory. In the experiment,the width of pump pulse light is 10 ns,the sampling interval of BOTDA system is 0.4 m. The spiral coiled optical fiber with 1 m length is used to monitor the axial temperature distribution of 0.5 m pipeline and monitoring spatial resolution is 0.5 m. Analysis results show that spiral coiled optical fiber is more available to improve the spatial resolution in monitoring pipeline temperature field..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 43 (2014)
Contour Line Extraction Method of Sky and Earth Background Based on Grey Threshold
YANG Fei, and GONG Hua
According to the characteristics of sky and earth background contour line such as fluctuation,blurring edge and slow change grey value of contour edge,grey threshold method is adopted to extract sky and ground background edges. It can provide technology support for subsequent sky background image segmentation and air tAccording to the characteristics of sky and earth background contour line such as fluctuation,blurring edge and slow change grey value of contour edge,grey threshold method is adopted to extract sky and ground background edges. It can provide technology support for subsequent sky background image segmentation and air target detection. The algorithm has the characteristics of easy to realize,few calculation,fast operation speed,precision location and low noise,which compensates the shortcomings of traditional image edge extraction algorithm. With background video images recorded from long range such as sky and surface,sky,surface and island,sky and mountain,the image processing result contrast analysis of the detection algorithm and other algorithm is proposed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 46 (2014)
Repetitive Control Strategy for Low Sampling Rate SPWM Inverter
YIN Shu, LIN Qiang, PAN Xue, and WANG Jian-hong
The harmonic problem of sinusoidal pulse-width modulation (SPWM) inverter output can be well dealt with by traditional repetitive control,but the control system tends to be unstable at low sampling rate. In the field of using high power inverter,the switching frequency of power devices is always lower. So the sampling The harmonic problem of sinusoidal pulse-width modulation (SPWM) inverter output can be well dealt with by traditional repetitive control,but the control system tends to be unstable at low sampling rate. In the field of using high power inverter,the switching frequency of power devices is always lower. So the sampling frequency of the control system is relatively lower. And there will be difficulties in traditional repetitive control application. The phase compensation in repetitive control is improved and fractional phase lead repetitive control is proposed. The stability margin of the system is improved and steady-state error is reduced by the method. Simulation results show that fractional phase lead repetitive control has better stability..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 51 (2014)
Control System of Laser Processed Multiple Degree of Freedom Worktable
ZHANG Ming-yong, TIAN Ming, and LIU Si-yu
The hardware and software of the control system on laser processed multiple degree of freedom worktable are designed. A programmable multi-axis controller (PMAC) is chosen as the key controller to control 5 motion axes during laser processing. The communication method between PC and PMAC through double-port random acceThe hardware and software of the control system on laser processed multiple degree of freedom worktable are designed. A programmable multi-axis controller (PMAC) is chosen as the key controller to control 5 motion axes during laser processing. The communication method between PC and PMAC through double-port random access memory (RAM) is introduced,which greatly improves the communication speed of the system. A visible man-machine interactive interface is designed to provide a friend interactive window for user communication control system. The writing processes of PMAC motion and PLC programs are described,which provides guidance for users to develop programs autonomously. These research and analysis have important reference value for hardware design and software development..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 56 (2014)
Application of ADRC Technology in High-precision Tracking System
CAI Mei-hua, YU Hai-liang, and CHEN Chen
An active disturbance rejection controller (ADRC) applied in high-precision tracking system is introduced. Comparing with conventional proportional-integral-differential (PID) controller,the function analysis of the controller is performed. With an actual system,control advantages of the controller are analyzed. PID anAn active disturbance rejection controller (ADRC) applied in high-precision tracking system is introduced. Comparing with conventional proportional-integral-differential (PID) controller,the function analysis of the controller is performed. With an actual system,control advantages of the controller are analyzed. PID and ADRC controllers are used respectively to design the speed loop of the high-precision tracking system. Consistent results from MATLAB simulation and experimental verifications show that the speed response characteristics of the servo system are improved by ADRC controllers,which can realize fast step response without overshoot. ADRC also has better tracking accuracy in terms of stability and robustness than that of conventional PID controllers in sudden disturbance..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 60 (2014)
Emission Spectra Analysis of Aluminum Plasma Induced by Laser
HAN Zhen-zhen, and HAO Xiao-jian
Laser-induced plasma technology is an important topic of the research on interaction between laser and material for a long time. The experiment system of laser induced plasma is researched and designed. Nd:YAG laser is used to induce Aluminum sample to produce plasma. And the Aluminum plasma emission spectra under diffLaser-induced plasma technology is an important topic of the research on interaction between laser and material for a long time. The experiment system of laser induced plasma is researched and designed. Nd:YAG laser is used to induce Aluminum sample to produce plasma. And the Aluminum plasma emission spectra under different energies are obtained. The element types contained in Aluminum sample and the changing relationship between spectral line intensity and laser energy are analyzed. Experimental results show that the Aluminum sample contains Fe and Mg elements and with the increase of laser energy,spectra intensity increases obviously..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 64 (2014)
Simulation of Electro-optical Jamming System on Surface Ship
XU Da-wei
The composition,main models and operation flow of the surface ship electro-optical jamming simulation system based on high level architecture (HLA) are introduced. The anti-ship missile motion and Infrared scene three-dimension models are described in detail. And the simulation results are analyzed. The simulation systThe composition,main models and operation flow of the surface ship electro-optical jamming simulation system based on high level architecture (HLA) are introduced. The anti-ship missile motion and Infrared scene three-dimension models are described in detail. And the simulation results are analyzed. The simulation system can be used in ship electro-optical jamming training and characteristic assessment..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 68 (2014)
Submarine Pipeline Safety Inspection Based on OTDR Distributed Optical Fiber
JIANG Nan, and YI Wen-suo
A kind of submarine pipeline safety inspection technology based on optical time domain reflection (OTDR) distributed optical fiber sensing system is proposed. The composition and operation principle of the system are analyzed. The positioning structure and the methods of the inspection system are described. The disturbA kind of submarine pipeline safety inspection technology based on optical time domain reflection (OTDR) distributed optical fiber sensing system is proposed. The composition and operation principle of the system are analyzed. The positioning structure and the methods of the inspection system are described. The disturbance position is obtained through the time delay between injection pulse and received signals. Theoretical analysis and inspection results show that the inspection system has better stability and positioning precision..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 73 (2014)
LED Junction Temperature Automatic Measurement System Based on Forward-voltage Method
ZHANG Wen-ting
Forward-voltage method is used to measure light emitting diode (LED) junction temperature. By using the data acquisition card,an automatic junction temperature measurement system of high power LED is developed. The high power LED on market is measured and compared to build I-V characteristic and current junction temperForward-voltage method is used to measure light emitting diode (LED) junction temperature. By using the data acquisition card,an automatic junction temperature measurement system of high power LED is developed. The high power LED on market is measured and compared to build I-V characteristic and current junction temperature curves of high power LED. The measured results and characteristic curves are analyzed and discussed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 77 (2014)
Simulation Analysis of Spacecraft Visibility Based on STK/Matlab
DU Yu-ping
Satellite tools kit (STK) is an important tool to simulate and analyze satellite system in the field of space,which can meet the requirements of satellite two-dimensional and three-dimensional visualization simulation. Based on the research on STK/Connect and with the STK/Matlab interface modules,the visibility of spacSatellite tools kit (STK) is an important tool to simulate and analyze satellite system in the field of space,which can meet the requirements of satellite two-dimensional and three-dimensional visualization simulation. Based on the research on STK/Connect and with the STK/Matlab interface modules,the visibility of spacecraft and target is simulated,and the better effect is obtained..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 6, 80 (2014)
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