Abstract: Polarization imaging technology is an important research aspect of imaging technology in China andforeign countries, which has important application value. The principle, composition and characteristics of infraredpolarization imaging system are introduced. The research status of the technology in China and foreign countries isintroduced. The potential advantages on manual target identification of MIR/LIR polarization imaging devices andinfrared polarization imaging technology are analyzed. Finally, the development of infrared polarization imagingtechnology is forecasted.

Abstract: In modern aerospace, according to star pattern distribution status obtained by star sensors, the atti-tudes of space vehicle are obtained. It has widely application for high reliability, confidentiality, accuracy and wide-ly suitable range. Firstly, traditional recognition algorithm is introduced. And then, improved algorithms referred inrecent years are summarized. And improved triangle, vector index, string index, parameter identification without cal-ibration and based on neural network and support vector machine algorithm are respectively introduced in detail.These methods in the area of recognition speed, success rate and real-time ability are improved to some extent. Atthe condition of low false alarm, the robustness of the algorithm is improved. Finally, the shortcomings of currentstar sensor identification methods are summarized and the development trends are forecasted.

Abstract: The algorithm for automatic crack detection and identification in slab track images is designedbased on digital image processing technology and many procedures such as image auto-segmentation, edge extrac-tion, edge removing of slab track structure and false crack identification. The algorithm has been proved accuratelyin extracting and marking the crack region by applying to slab track images from actual acquisition. In the experi-ment of 1000 images, all the six manually detected crack images are also detected automatically by the algorithm, i.e., the accuracy rate is 100%. The computational speed of the algorithm can satisfy the real-time detection require-ments.

Abstract: The modified repetitive control and differential feed-forward control are combined to form com-pound control on the position loop of the servo system of three-axis turret in order to meet the increasing accuracy re-quirement. According to the structure of the turret servo system, models of current loop, velocity loop and positionloop are analyzed and built. And the modified repetitive controller is designed for the position loop. The coupling ef-fect from three frames of the three-axis turret rotating simultaneously is considered in the design. And the speed andstability 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 require-ments.

Abstract: The measurement system for laser tracker's target-missing quantity based on four-quadrant detectorsis introduced According to the operation principle of the detector and the facula characteristic of tracking laser, the re-lationship between target-missing quantity and the output current of the four-quadrant detector is nonlinear Accord-ing to the problem, piecewise linear interpolated algorithm is adopted The measurement system is calibrated by ahigh-precision displacement platform and measurement experiments are performed The results show that the systemhas a fast measurement speed and high measurement accuracy The time of measurement per second is up to 600times or more and the accuracy is 5 m within ±500 m measurement range The system can be widely applied in the re-lated fields

Abstract: Influenced by many factors, the obtained Infrared images usually have a low signal-to-noise ratio(SNR) and contrast, which brings a certain difficulty to target extraction. Based on analyzing the direction gradient ofthe target, with morphology algorithm, a new detection algorithm of small Infrared targets is introduced. Firstly, fourreference points at the direction of four neighbor domain of the tested point are chosen. The potential targets are de-termined according to multi-level gradient feature between the tested point and the reference point at the direction.And then, the adjustable feature of structure element is used to choose appropriate structure element. Finally,through morphology processing, noise points are eliminated and the target is determined. The algorithm has simplecalculation and in no need of predicting background. Experimental results show that small targets can be detected ef-fectively in low signal-to-noise ratio(SNR) images.

Abstract: A research on laser coherent detection is developed to detect underwater acoustic signals in differ-ent frequencies and vibration intensities under laboratory conditions. And an experiment system is establishedbased on the research. A beam of laser is irradiated water surface when the water surface is fluctuated by underwa-ter 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 underwateracoustic signals. Experimental results obtained under different conditions are compared and analyzed. The resultsshow that underwater acoustic signal can be detected effectively with laser interference detection technology. Anddetection effects become weaker with the increasing of frequency and the weakening intensity of signals. Full fiberpath design is used in the experimental system and better effect is got.

Abstract: According to the reasons of threedimensional(3D) angle deformation of large structure in engineering applications and measurement requirements, the research states of optical small angle measurement method used in engineering area are described and analyzed. Some methods such as autocollimation, polarization light,light source target, moire fringe, image shape deformation and photography and videography are introduced. Comparing with the characteristics of the methods, the problems and development of optical 3D angle deformation measurement technology are discussed.

Abstract: A fast multifocus image fusion algorithm based on lifting wavelet transform is introduced. Firstly,the original images are decomposed into four subbands such as LL, LH, HL and HH through the algorithm. And then, high frequency details subbands such as LH, HL and HH representing three directions are performed lifting wavelet inverse transform to obtain high frequency details images of subbands on all directions. Nonuniform weighted area energy of obtained high frequency detail images is calculated through Gaussian kernel weight algorithm. And the final fusion images are obtained according to image fusion rule based on energy. Comparing with the characteristics of multifocus image fusion schemes, experimental results show that the method is more effective than present methods on processing speed at the condition of same fusion effect.

Abstract: According to the empirical relationship between the water content and visibility in radiation and ad-vection fog, the calculation formula of laser atmosphere transmission attenuation in fog weather is analyzed. Threekinds of commonly used fog attenuation empirical models are simulated by Matlab numerical value. The relation-ship between laser attenuation coefficient and visibility in fog weather is obtained. According to the shortcomings ofthree kinds of semi-empirical models, a new empirical formula containing some information such as measuring dis-tance and field of view of a receiver is proposed based on Mie scattering theory finally.

Abstract: Avalanche photodiode(APD) has the characteristic of detecting weak light signals. The detectioncharacteristic of APD is directly depended on the design of relevant processing circuits. The operation principle andcharacteristics of APD electro-optic detectors and external influence factors are analyzed. The composition of opera-tion circuit and the best design of APD are researched. During signal post processing, the signal amplification pro-cessing circuit of APD is designed. And the requirements of low noise, bandwidth matching and weak signal amplifi-cation are met, which has an important significance in the field of weak light signal detection of APD.

Abstract: Based on the calculation of labyrinth seal leakage ratethe factors influencing the leakage ratare described. Three characteristics such as seal profile, throttling gap and number are analyzed respectively. The results show that round profile is avoided for higher leakage rate. Better seal effect is got to choose a smaller seal value for throttling gap changing linearly with leakage rate. The more is throttling number, the fewer is leakage rate.But with the increasing of throttling number, throttling effect is not better and the economic cost is higher. So the appropriate throttling number is needed to be chosen in the design. Experimental results show that engineering application demands are met by electro-optical rret labyrinth eal design.

Abstract: In the field test, long-ranged laser spot detection and spot image energy distribution are difficulties for testing. According to the problem, new spot detection measure and image display methods are proposed. Based on the research on light spot detection technology and different application background requirements, a new external trigger synchronous light spot detection control mode is proposed to improve detection precision of light spot image and target directional precision of laser irradiator. On the laser spot image display, through the research on light spot image processing technology, the capabilities of image parameter solution and 3D power distribution display of light pot image are enhanced further to provide references for ser irradiator beam quality analysis.

Abstract: In laser array coherent combination, residual phase error is unavoidable for the influence of phasenoise and the limit of phase control system bandwidth. The far-field intensity distribution with residual phase errorin laser array coherent combination is deduced on theory. Taking beam propagation factor(BPF) as the assessmentstandard of combination effect, the influence on coherent combination from residual phase error is analyzed.

Abstract: In the view of the problem on the measurement of projectile coordinate based on laser screen thatneeds massive optical signals, the design of massive optical signals acquisition and storage system is proposed FP-GA is used as the chip of acquisition and control and FLASH is used as the chip of storage The collected photoelec-tric signals are temporarily placed in the FPGA build-in FIFO, and then these signals are processed in the FPGAand stored in the FLASH, and USB interface is used to communicate with computer The simulation results showthat the system could collect and store 64 digital signals successfully, it has flexible structure, simple operation, ac-curate data and large storage

Abstract: 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 grat-ing and assistant evaluation are discussed respectively. And a training grating process is proposed. The applicationsof data collecting, expert system and integrated ambiguity evaluation method in the design of training simulator eval-uation system play a very important role. Research emphasis should be improving intelligence and flexibility so asto adapt to the internet training of complex and large simulators or multi-simulators in the future.

Abstract: According to low heat dissipation efficiency of heat dissipation pipe, building a 3D model of heatdissipation pipe with Solidworks, the boundary conditions enacted under actual experimental conditions are stressedoutside the model The outlet temperature of the heating-radiator under the condition of special heat dissipationpipe size is obtained through finite element analysis on the pipe model using ANSYS thermal fluid coupled moduleThe new outlet temperature is obtained through adjusting the pipe size The data group of the outlet temperature isobtained through adjusting the pipe size many times Finally, according to the data group after analyzing, the pipesize is adjusted using bisection method to realize the expected target of heat dissipation pipe size optimization Andit provides references for the similar size optimization design in the future

Abstract: Detecting light stripe center position accurately has critical consequences for the accuracy of the structured light measurement system. A robust method which extracts the light stripe center by multi step is proposed.Firstly, the noise points are moved by adaptive thresholds. Then, the initial centers of light stripes are obtained using expansion and thinning algorithm. After that, those initial centersdirection can be gained with their gradient.At last, the subpixel center line of structured light is obtained by computing the graygravity along the stripenormal direction. The method applied to a tunnel contour deformation detection system which measuring principle is linear structured light. The test results showed that the method can accurately extract the center line.