Journals >Electro-Optic Technology Application
Contents
2014
Volume: 29 Issue 2
23 Article(s)
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Research Article
[in Chinese]
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 1 (2014)
Infrared Target Simulation Technology
ZHOU Bing-yu, REN Ying, and WANG Xiao-jie
The target infrared radiation characteristics are analyzed. Parameters of equivalent infrared signal source in the field are calculated, and construction of infrared target simulation system in the field is described. The main parameters of the system are confirmed according to the analysis and calculation of equivalenThe target infrared radiation characteristics are analyzed. Parameters of equivalent infrared signal source in the field are calculated, and construction of infrared target simulation system in the field is described. The main parameters of the system are confirmed according to the analysis and calculation of equivalent infrared signal source parameters in the field. The composition and operation principle of the system are introduced. The research results show that the target characteristics of the system in the field are fully showed, which can be an important method for performance test of infrared system in the field..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 1 (2014)
Test Research on Detection Ability of Infrared Guidance System for Freeway Traffic in Fog
DING Li-wei, WANG Zong-li, and CHENG Ming-yang
In order to analyze the detection ranges of infrared guidance systems for freeway traffic under different visibility conditions, various influence factors from atmospheric attenuation on infrared radiation in heavy fog are analyzed according to theory models and calculation methods of infrared atmospheric transmission.In order to analyze the detection ranges of infrared guidance systems for freeway traffic under different visibility conditions, various influence factors from atmospheric attenuation on infrared radiation in heavy fog are analyzed according to theory models and calculation methods of infrared atmospheric transmission. Based on it, a research method of detection ability of infrared guidance system in fog is proposed. The infrared radiation parameters of objects can be measured through simulating the meteorological conditions in natural fog in a laboratory. And the detection ability of the system in natural fog is evaluated through theoretical analyzing and practical validating. Experimental results show that the infrared guidance system for freeway traffic has better ability to detect objects in fog..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 4 (2014)
Bayes Estimator Background Suppression Method for Infrared Small Target Detection
CHEN Feng, DENG Jian, and MAO Jian-ying
According to the background suppression issue in infrared small target detection, a new method is put forward. The pure background of current viewing frame is estimated through the methods of distribution image and Bayes estimator based on the finite frame image. The images only containing targets and a few noise pointAccording to the background suppression issue in infrared small target detection, a new method is put forward. The pure background of current viewing frame is estimated through the methods of distribution image and Bayes estimator based on the finite frame image. The images only containing targets and a few noise points are obtained through calculating each image and background images. The images are segmented and distinguished to suppress effectively the fluctuation background in images so that the error rate of post-processing is reduced. The effectiveness of the method is proved by experiments..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 10 (2014)
Research on Coaxial Powder Feeding Nozzle for Laser Cladding
XUE Fei, WANG Yao-min, and LIU Shuang-yu
The effect of laser cladding is directly influenced by powder feeding nozzle which is one of the key components in powder feeding system. With the development of laser cladding technology, powder feeding nozzle is researched domestically and abroad deeply. New powder feeding nozzles are developed and cladding effect asThe effect of laser cladding is directly influenced by powder feeding nozzle which is one of the key components in powder feeding system. With the development of laser cladding technology, powder feeding nozzle is researched domestically and abroad deeply. New powder feeding nozzles are developed and cladding effect as well as powder utilization coefficient is improved effectively. The research progress and powder feeding principles of domestic and foreign coaxial powder feeding nozzle are summarized briefly. The situation of existing coaxial powder feeding nozzle is analyzed and the shortcomings are pointed out. One of the key issues for developing the powder feeding laser cladding is to improve the design of powder feeding nozzle. And the future development of coaxial powder feeding nozzle is forecasted..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 13 (2014)
Experiment Research on Underwater Acoustic Signal for Laser Detection
CAO Zeng-hui, ZHENG Tian-tian, SUN Teng-fei, YANG Bao-lei, LI Dan, and ZHANG Jun
A research on laser coherent detection is developed to detect underwater acoustic signals in different frequencies and vibration intensities under laboratory conditions. And an experiment system is established based on the research. A beam of laser is irradiated water surface when the water surface is fluctuated by undA research on laser coherent detection is developed to detect underwater acoustic signals in different frequencies and vibration intensities under laboratory conditions. And an experiment system is established based on the research. A beam of laser is irradiated water surface when the water surface is fluctuated by underwater acoustic signals. The generated scattering light with acoustic wave information will interfere with reference light. Interference signals are collected and processed to obtain the frequency and intensity information of underwater acoustic signals. Experimental results obtained under different conditions are compared and analyzed. The results show that underwater acoustic signal can be detected effectively with laser interference detection technology. And detection effects become weaker with the increasing of frequency and the weakening intensity of signals. Full fiber path design is used in the experimental system and better effect is got..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 17 (2014)
Microscopic Phase Change of Ni-Ti Shape Memory Alloy Target under Femto-second Laser Ablating
TANG Yi-bo, CHEN Bing, CHEN Zhi-yong, ZHU Wei-hua, LI Yue-hua, and WANG Xin-lin
Incorporating with molecular dynamics method of two-temperature model, the effect of B2 structure Ni-Ti shape memory alloy film ablated by femto-second laser with 100 fs ultra-short pulse width is simulated in number and the phase transition of the target with lower energy density is researched. The results show that tIncorporating with molecular dynamics method of two-temperature model, the effect of B2 structure Ni-Ti shape memory alloy film ablated by femto-second laser with 100 fs ultra-short pulse width is simulated in number and the phase transition of the target with lower energy density is researched. The results show that thermal energy relaxation is caused by the propagation of pressure wave when ultra-high speed laser interacts with B2 structure Ni-Ti shape memory alloy. The laser with 100 fs pulse width and 20~35 mJ/cm2 power density interacting with the target, the phase change of the target is induced by the pressure wave from ablating process during propagation. And a sandwich structure is formed..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 22 (2014)
Research on Photonic Crystal Fiber Characteristics for High Power Amplifier
CUI Su, and WEI Huai
Rare earth-doped photonic crystal fiber (PCF) is a kind of ideal material to produce high power fiber lasers and amplifiers, which is particularly important to the research on rare earth-doped PCF. A new octagonal PCF with air hole and arranged in double rows is proposed. And the characteristics are analyzed. InfluenceRare earth-doped photonic crystal fiber (PCF) is a kind of ideal material to produce high power fiber lasers and amplifiers, which is particularly important to the research on rare earth-doped PCF. A new octagonal PCF with air hole and arranged in double rows is proposed. And the characteristics are analyzed. Influences from the changes of doped fiber coil diameters, doped refractive index and wavelength on effective model field areas and refractive index are researched. And overlap factor characteristics of the rare earth-doped fiber as a fiber amplifier are calculated. Theory bases of producing photonic apparatuses such as fiber amplifiers are established..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 27 (2014)
Fabrication Technology and Application in Spectral Lens of Diffractive Optical Elements
CHENG Xi-min, BAI Yu, XIE Wei-min, XING Ting-wen, and LIN Wu-mei
The fabrication technologies of diffractive optical elements such as photolithography, thin-film deposition, direct writing, diamond turning, excimer laser etching, gray-tone mask and replication are summarized. The technology processes of the methods for fabricating diffractive optical elements are introduced in detaiThe fabrication technologies of diffractive optical elements such as photolithography, thin-film deposition, direct writing, diamond turning, excimer laser etching, gray-tone mask and replication are summarized. The technology processes of the methods for fabricating diffractive optical elements are introduced in detail. And the advantages and disadvantages of the methods are analyzed. The applications of diffractive optical elements in spectral lens are introduced. The detailed design examples of diffractive surface in the waveband of visible, infrared and ultraviolet spectrum are described respectively. The conclusion shows that diffractive optical elements can help to increase design freedom, simplify system structure, reduce system volume and weight, and improve system astigmation and imaging quality..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 31 (2014)
Analysis and Design of Peak Holding Circuit for Narrow Pulse
SONG Yi-heng, and MENG Fan-bin
Firstly, the operation principles of peak holding circuits such as voltage and transconductance types are introduced. The factors influencing the precision of transconductance peak holding circuit are simulated and analyzed by Multisim9. The accuracy holding is greatly influenced by the choosing of peak holding capacitFirstly, the operation principles of peak holding circuits such as voltage and transconductance types are introduced. The factors influencing the precision of transconductance peak holding circuit are simulated and analyzed by Multisim9. The accuracy holding is greatly influenced by the choosing of peak holding capacitance. Then the simplified reference formula for choosing the capacitance values is given. Finally, experiments show that the transconductance peak holding circuit with MAX436 as design core has higher peak holding accuracy..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 39 (2014)
Design and Implementation of Testing System Based on Logic Time Sequence
WANG Hua-qiao, WANG Ming-zhong, and WANG Hui-peng
In order to monitor and analyze quantitatively the important performance parameters of a system in operation during full process and satisfy the operation requirements under special operation environments such as high pressure impact, a measurement and storage system design method is proposed based on field-programmablIn order to monitor and analyze quantitatively the important performance parameters of a system in operation during full process and satisfy the operation requirements under special operation environments such as high pressure impact, a measurement and storage system design method is proposed based on field-programmable gate array (FPGA) and Flash dielectric. The circuits and operation principles of the modules in hardware system are described in detail. The corresponding timing sequence logic of digital circuits in the system is given. The methods for encoding in collection and for improving storage speed are introduced. The accurate and reliable design requirements in operation are achieved. And detailed basis is provided for analyzing the operation states of the device based on the recorded data..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 43 (2014)
Research on Filtering Characteristics of All-fiber Series Coupled Dual Micro-ring Resonator
CHEN Fei, PEI Li, and LIU Chao
According to transmission matrix method, the transmission characteristics of series coupled dual micro-ring resonator filter are analyzed. The transmission function formula, the best coupling conditions of channels and drop channels are deduced. At the condition of neglecting loss, the influence of coupling coefficientAccording to transmission matrix method, the transmission characteristics of series coupled dual micro-ring resonator filter are analyzed. The transmission function formula, the best coupling conditions of channels and drop channels are deduced. At the condition of neglecting loss, the influence of coupling coefficients and micro-ring radius on filtering characteristics is calculated and analyzed. And parameters are optimized. The calculation results show that when the radius are 40 μm and 50 μm, the coupling coefficient of micro-ring and line waveguide is 0.2, the free spectral range of the filter is 22 nm and 3dB bandwidth is just 0.27 nm, therefore, only a special wavelength is filtered in dense wave division multiplex (DWDM) system with 50 GHZ internal..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 46 (2014)
Research on Temperature Cross Sensitivity Compensation Technology of FBG Strain Sensor
WANG Wen-zhen, and LIU Yue-ming
Binary regression analysis algorithm is proposed and adopted to realize the temperature compensation model of fiber Bragg grating (FBG) strain sensor through analyzing the basic operation principle of the sensor and the issues of FBG strain and temperature cross sensitivity. Computer program and experiment results showBinary regression analysis algorithm is proposed and adopted to realize the temperature compensation model of fiber Bragg grating (FBG) strain sensor through analyzing the basic operation principle of the sensor and the issues of FBG strain and temperature cross sensitivity. Computer program and experiment results show that the temperature sensitivity coefficient is lower from 2.74×10-2/℃ to 9.16×10-5/℃ after data fusion processing. And the temperature cross sensitivity is obviously improved to meet the actual measurement requirements of strain measurement in high-temperature pressure conduit..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 51 (2014)
Parameter Design of Lag Compensation Regulator
LIU Chao, and JIN Yan
In order to solve the problem that it is difficult to choose the parameters of the regulator for lag compensation of velocity and acceleration during the design of turret servo system, a method to confirm the parameters of the regulator is proposed. According to lag compensation principle, the model and its parameter rIn order to solve the problem that it is difficult to choose the parameters of the regulator for lag compensation of velocity and acceleration during the design of turret servo system, a method to confirm the parameters of the regulator is proposed. According to lag compensation principle, the model and its parameter range of the regulator are confirmed at first. And then, several groups of lag compensation parameters keeping the stability of the system are obtained through the method of exhaustion. Then M-file is written by MATLAB with the feature of simulink simulation parameters being modified on-line. The best group of parameter is determined through calculating one by one the tracking accuracy corresponding to each group of parameter. The tracking accuracy of the turret choosing the best group of parameter is proved finally. Experimental results show that the tracking accuracy of the turret using the lag compensation regulator with new design method is 14.39” and the accuracy requirement of the system is met completely..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 57 (2014)
Security Module Design of Airborne Equipment
LIU Meng, and HOU Yu
The design structures of security module in airborne equipments are described. The design principles of module circuits, the control flow of voltage regional protection and serial key code as well as the security logical architecture are introduced. According to the characteristics of airborne power supply, the power sThe design structures of security module in airborne equipments are described. The design principles of module circuits, the control flow of voltage regional protection and serial key code as well as the security logical architecture are introduced. According to the characteristics of airborne power supply, the power supply compatibility of the equipment is enhanced and the safety and reliability of the equipment can be ensured using the technology of voltage regional protection and serial key matching..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 62 (2014)
Design of High Speed Grating Image Acquisition System
YANG Ting, and NIAN Wei
In order to solve the issues of complex grating testing and expensive test equipment, based on ARM micro-controller STM32F103, USB 2.0 and linear array CCD TCD 1209D, a grating image speed acquisition system with acquisition and display function is designed. CCD operation time sequence is simulated by GPIO of ARM chip,In order to solve the issues of complex grating testing and expensive test equipment, based on ARM micro-controller STM32F103, USB 2.0 and linear array CCD TCD 1209D, a grating image speed acquisition system with acquisition and display function is designed. CCD operation time sequence is simulated by GPIO of ARM chip, and the driving time sequence is realized through software programming and auxiliary circuits. And then, CCD signal acquisition and USB transmission are realized with AD in STM32F103 and USB 2.0 controller and image display software is written in PC. The results show that the grating image signals with light and dark stripes outputted by CCD is transmitted via USB and the images of the signals can be displayed correctly by image acquisition software in PC..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 66 (2014)
Design of Laser Diode Driving Power Supply for High Power Fiber Laser Pumping Source
ZHANG Yue-ling, and ZHOU Guan-jun
According to the laser power supply requirements of semiconductor pumping fiber lasers with high power and low noise, as well as the analysis of laser diode (LD) operation function and output characteristics, a LD driving control circuit with high speed micro-computer unit ADuc842 as the main control chip is designed. According to the laser power supply requirements of semiconductor pumping fiber lasers with high power and low noise, as well as the analysis of laser diode (LD) operation function and output characteristics, a LD driving control circuit with high speed micro-computer unit ADuc842 as the main control chip is designed. Automatic current control (ACC) and automatic temperature control (ATC) are used in the design to realize constant current source driving and constant temperature control of LD. Protection circuits such as double current-limiting circuit, surge absorbing circuit and low speed starting circuit are adopted in the design so as to improve the anti-interference ability and operation stability. Experimental results show that output current stability error is better than 0.5% and temperature stability error is ±0.1 ℃..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 70 (2014)
Driving Circuit and Thermal Radiation Design for High Power LED
FAN Yong-jin, WANG Dong-ming, and WU Gang
The characteristics of driving power and thermal radiation for high-power LED light source are analyzed. Based on the research on application efficiency, light source heat generation, heat conduction and heat current characteristics of high power LED driving power, a method of improving driving circuit and structure deThe characteristics of driving power and thermal radiation for high-power LED light source are analyzed. Based on the research on application efficiency, light source heat generation, heat conduction and heat current characteristics of high power LED driving power, a method of improving driving circuit and structure design is proposed. The efficiency of the power source is improved and the thermal loss is reduced through boost-buck constant current circuit as well as using the frequency transformer rectifier in the driving circuit. For structure design, thermal radiation effect is improved further through optimizing the materials for the fins and interfaces, improving the fins structure, installing heat pipes and temperature equalization plate. So the quality and performances of the product will be better..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 75 (2014)
Decoupling and Control of Three-axis Turret Based on Modified Repetitive Control System
LIN Cun-hai, and CAO Guang-feng
The modified repetitive control and differential feed-forward control are combined to form compound control on the position loop of the servo system of three-axis turret in order to meet the increasing accuracy requirement. According to the structure of the turret servo system, models of current loop, velocity loop andThe modified repetitive control and differential feed-forward control are combined to form compound control on the position loop of the servo system of three-axis turret in order to meet the increasing accuracy requirement. According to the structure of the turret servo system, models of current loop, velocity loop and position loop are analyzed and built. And the modified repetitive controller is designed for the position loop. The coupling effect from three frames of the three-axis turret rotating simultaneously is considered in the design. And the speed and stability of three inner frames are analyzed. Simulation results show that the turret has fast position control response, high precision and strong anti-interference using compound control, which can meet the system performance requirements..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 79 (2014)
Design of Grading Function for Training Simulator
ZHAO Fei-fei
According to the requirements of training simulator evaluation function and research experiences, the design of four grating modes such as theory examination, operation training grating, complex training task grating and assistant evaluation are discussed respectively. And a training grating process is proposed. The apAccording to the requirements of training simulator evaluation function and research experiences, the design of four grating modes such as theory examination, operation training grating, complex training task grating and assistant evaluation are discussed respectively. And a training grating process is proposed. The applications of data collecting, expert system and integrated ambiguity evaluation method in the design of training simulator evaluation system play a very important role. Research emphasis should be improving intelligence and flexibility so as to adapt to the internet training of complex and large simulators or multi-simulators in the future..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 83 (2014)
Analysis and Design of Smoke Screen Deployment
GU Wen-hui, and GAO Hong-jie
The minimum smoke shielded area algorithm is designed and the minimum area and space coordinates of the shielded area are given for protecting the targets effectively with the minimum smoke shield. The influence of wind on the exploding point during smoke deployment is analyzed. The adjustment algorithm of deployment aThe minimum smoke shielded area algorithm is designed and the minimum area and space coordinates of the shielded area are given for protecting the targets effectively with the minimum smoke shield. The influence of wind on the exploding point during smoke deployment is analyzed. The adjustment algorithm of deployment angle is proposed. The shielded effect influenced by smoke drifting is researched. Area compensation algorithm is described. The smoke shielded areas and central point coordinates at subarea are obtained finally under current weather conditions..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 87 (2014)
Research on Simulation Method of Ultraviolet Radiation Characteristic for Missile
ZHANG Jian-xin, and ZHANG Bao-jun
For simulating the strong ultraviolet (UV) radiation of the missile in flight, UV dynamic radiation characteristics of the missile are analyzed. And the principle, characteristics and applications of manual UV light source suitable to be radiation source are described and compared. Control modes of missile flight featuFor simulating the strong ultraviolet (UV) radiation of the missile in flight, UV dynamic radiation characteristics of the missile are analyzed. And the principle, characteristics and applications of manual UV light source suitable to be radiation source are described and compared. Control modes of missile flight features and applicable light source are introduced and compared finally..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 90 (2014)
Test Analysis of Rise Time of Semiconductor Laser Based on Thermocouple Dynamic Calibration System
YANG Yu
A high power semiconductor laser as the temperature-generating device is introduced. The laser pulse is sent out from the laser to generate a quasi-step temperature change signal on the calibrated thermocouple surface. The signal is detected simultaneously by a fast response infrared detector and a slow response calibrA high power semiconductor laser as the temperature-generating device is introduced. The laser pulse is sent out from the laser to generate a quasi-step temperature change signal on the calibrated thermocouple surface. The signal is detected simultaneously by a fast response infrared detector and a slow response calibrated thermocouple. The former value is used as the true value to calibrate the new dynamic calibration system of the latter. For test the fast response thermocouple, the response time of the temperature-generating device is needed to be calibrated. Thus a fast response photodiode is chosen as a photoelectric detector. A test method of the rise time of the laser is obtained through building a test circuit. And a high power semiconductor laser with 980 nm is tested and the results are given. Experiments show that the rise time of the high power semiconductor laser is at nanosecond level and the dynamic calibration of the thermocouple with time constant at microsecond level can be realized..
Electro-Optic Technology Application
- Publication Date: Jan. 01, 1900
- Vol. 29, Issue 2, 95 (2014)
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