Abstract: Based on the vector theory of optical reflection,nonlinear scanning traces characteristics of the two-dimensional pointing mirror in the scanning mode in the given area is analyzedThe expression of scanning trace and image rotation angle and the method of non-linear scanning trace modification are givenWithout eliminating the image rotation,this mode can be used in point object detecting system,such as IR detecting system

Abstract: Based on the analysis of matched grating demodulation principle,a novel fiber Bragg grating(FBG) vibration sensor was designed.A simply supported beam structure is adopted,so center wavelength of sensing grating and natural frequency of the sensor can be changed by adjusting the beam.The matching demodulation is achieved.At the same time,the range of frequency measurement is expanded.The sensor has good frequency detection performance in standard signal vibration detecting experiments.The frequency scope is up to 200 Hz.In addition,the detected signal has good signal to noise ratio at 20 Hz and 190 Hz.

Abstract: The main reasons of attenuation produced during the transmitting of infrared radiation in the atmosphere are introduced,and some usual methods for calculating the atmospheric transmission of infrared radiation and software are briefly shown.The method of using software LOWTRAN 7 and the in-out file formats are described.The importance of application-embedded LOWTRAN 7 is discussed and an application-embedded method of LOWTRAN 7 is put forward.The relevant circuit principle diagram and the subroutine source code programmed using Delphi 6 are given.

Abstract: The causation of random vibration is introduced,and the usual design and test methods were summarized.Based on Gaussian distribution and Miner theory,the simulating analysis method and process for random vibration were put forward.Through the process of emulating and analyzing certain equipments,the practical ways to determine the boundary conditions of random vibration and to make the simulation and analysis by software were described,the problem to which must be paid attention during the simulation and analysis was point out.It can be a reliable reality method for this kind of the simulation analysis.

Abstract: Aiming at the problems of multi-target tracking in video sequence,a multi-target tracking algorithm based on mean-shift and particle filter is proposed,which resolves the problem of target shielding by adopting the distance threshold and similar degree threshold among the targets in combination with Mean-shift algorithm and particle filter tracking algorithm.Experiment results show that the multi-target tracking algorithm can reduce the tracking time while ensuring the effects of tracking multi-target,so that the capability of the designed tracking system is improved.

Abstract: The laser active imaging technology's principle,characteristics and performance index are described.Through the theoretical calculation and the experiment,the laser active imaging distance and the recognition capability are studied.The parameters such as resolution,laser divergence angle,focal length and field of view are quantitatively analyzed.According to the results of theoretical study and experimental verification,the correctness of the analysis is proved.To increase imaging distance,the effect of reducing the divergence angle is more obvious than that of enhancing laser power.When the divergence angle is less than 4 mrad,the image identification of the 2 m target at 10 km can be achieved.

Abstract: The influence of axis and radial temperature gradients on the deformation of optic window with large aperture is discussed.The optic window deformation with temperature and pressure differences on the both sides is analyzed by ansys program.Zernike polynomial,as an interface tool,connects the ansys program simulated results with the optic design program.In zemax program,the influence of optic window deformations at 12～27℃ on the optic system image quality are analyzed.

Abstract: The parabolic reflector is an ideal xenon lamp reflector.According to the features of the parabolic reflector,the relationship among the focal length,diameter,axial defocus and the wrap angle of reflector are analyzed.The inflence axial defocusing on the wrap angle and the distance of complete flash is also discussed.

Abstract: Data acquisition in transient electromagnetic method(TEM) is in a high voltage and strong electromagnetic field.If there is not electric isolation between analog quantity and digital amount,the high voltage is easy to entry in the low voltage device and destroy it.A bipolarsignal isolation circuit was designed based on the features of the high-linearity optocoupler HCN201,and the working principle and the features of the high-linearity optocoupler HCN201 were introduced.The experimental results show the circuit has the better linearity,high acuracy and practicability in TEM system.

Abstract: Closed feedback control to DC motor was made by PID based on SPMC75F2413A SMC and coder in order to make the hook-liked scanning probe driven by the DC motor to rest on the specified position.The PID feedback control algorithm can be used to realize displacement control.The coder changes the displacement of the hook-liked scanning probe to electric pulse.Through SPMC75F2413A SMC,these electric pulses were analyzed and compared to the specified value.The output signals were calculated by the differences to control the right and reverse round of the motor,i.e.when the hook-like probe is higher than the position,the DC motor rotates reversely immediately,if lower,the motor rounds rightly.

Abstract: In the inverse synthetic aperture radar(ISAR) imaging,the non-uniform rotation of the targets can bring phase errors relevant to scatters' positions.The phase errors can not be expressed by one uniform function.But the scatters' phase precision is very important to phase emendation of ISAR's autofocus. For the accelerating targets,an autofocus algorithm based on fractional Fourier transform(FRFT) is proposed.FRCFT is applied to process the signals in the selected range unit,and extract the scatter's signal with the maximum energy.this selected scatter signal is taken as the reference signal to eliminate the plane motion phase errors.By the same method,the scatters' signals with maximum energy are also extracted on several selected range units.And modulated frequency signals are weighted on the average to get the optimized estimated values of the non-uniform rotation parameters.Based on the parameters,the signals are sampled non-uniformly to eliminate the phase errors.Finally,the simulation results demonstrate that the algorithm can eliminate the phase errors very well.

Abstract: According to the analysis of laser-pulse encoding modes,a method to decode laser-pulse series based on autocorrelation matrix statistic is put forward.The received laser-pulse series are used for constructing first order difference autocorrelation matrix and second order difference autocorrelation matrix.The elements of the two autocorrelation matrixes are counted in histogram mode.The laser-pulse series encoding mode can be classified by the characteristic of the two histograms,the time parameter of the pulse can be calculated out.The validity of the algorithm is tested by emulating experiment.Different modes of encoding laser-pulse are generated,and the missing probability and false probability are set,then the laser-pulse series are decoded by the algorithm.The emulating experiment shows that the algorithm has high precision,good real-time and anti-interference performance.

Abstract: In order to improve the imaging quality and real-time demands of infrared foccal plane(IRFPA) detectors,an infrared image digital processing system with a high speed signal processer in its centre was proposed.The composition of the dual infrared imaging system,the hardware structure,the chip selection,data processing,as well as the principle of infrared image display and the processing of the video synthesis were described;At the same time,the verilog codes of the display chip ADV7123 were given.The results of imaging were certified satisfactory,which can meet the infrared image real-time demands and has high value in applications.

Abstract: The jamming mechanism of the high-repetition-frequency laser to the laser seeker is discussed.The parameters,such as the laser interference frequency,output power,laser seeker's time gate,automatic gain control are analyzed.The phenomena is found in the research that the better jamming effect can be obtained even in the circumstance when the frequency of interference laser does not to meet the relationship of "frequency and wave gate" requirement,and this phenomena is theoretically analyzed.

Abstract: The basic method of describing the polarization characteristics of atmospheric scattering light is discussed.According to the Rayleigh and Mie scattering theories,transfer Mueller matrix is given to respectively establish the models for the single polarization characteristic of atmosphere molecule and aerosol scattering lights.Meanwhile,through simulating the values calculation,the polarization characteristics of nature light,horizontal linear polarization light and 45°linear polarization light are studied,which are influenced by the atmosphere molecule and aerosol.Lastly,a method of vector transfer equation is given to deal with the polarization problems when the atmospheric scattering light scatters more times.

Abstract: Based on introducing the form and the principle of the system for large-aperture collimator,the indoor emendation measurement of excessive optical axis parallelism for photo-electricity measuring equipment was done using the measurement principle.The optical axis parallelism emendation for TV/IR/Laser was implemented through fabricating standard laser target and collecting laser spot of the laser target by sensitive paper,so that the optical axis non-parallelism of TV/IR and Laser meets the technical index requirement,the good effect is realized.

Abstract: Spectrometer is one of the most important optical instruments.CCD spectrometer technology is moving in the direction toward miniaturization and even micro-miniaturization.A design project of intelligent CCD detector specifically for portable spectrometers is proposed in accordance with the features of the portable spectrometer.This detector combines the intelligent control ability of MCU and the accurate and programmable timing feature of CPLD,and integrates with a USB interface to facilitate data acquisition and light integral-time control from the host computer.The design realized a miniaturization,intelligence and integration for spectrometer CCD detector is implemented.

Abstract: The formula of radar cross section(RCS) of chaff and the derived formulas are educed.Based on the moment method and the Galer Kin method,the differences between the induction current distributions of chaff scatting and Dipole radiation,and the far-field patterns are calculated and compared,and the influences of the attitude of chaff in space on induction current distributions and far-field patterns are discussed.Lastly,the definition and formulas of average effective RCS of one single chaff in the single-station and bi-station scattering conditions are given.

Abstract: Aiming at the choice of proposal function and degeneracy problem in particle filter(PF),an improved algorithm is put forward.Unscented Kalman Filter(UKF) is used to produce the proposal function,the estimate accuracy can be improved,Markov Chain Monte Carlo(MCMC) is applied to keep the diversity of the particles and solve the degeneracy problem.The simulation result illustrates the algorithm is superior to PF,UPF,PF-MCMC(PF with MCMC) and PF-EKF-MCMC(PF with EKF and MCMC) in accuracy.

Abstract: For the CCD serial star images,if there is a high bright star in the field of view,the CCD readout circuit voltage can be over high and the same line or column gray value of the CCD image is on the high side,a light line traveling across the star centre is formed in the imageAs the bright line exhibits great similarity to the motion of space targets,and disturbs greatly target detection and identification performance,it must be eliminatedBased on the analysis of the star-sky image,an automatic detection algorithm of bright line in star-sky images is put forwardWith the isotropy property of star imaging and auto-registration character of Fourier transform,the algorithm can automatically detect and eliminate the bright line both in space domain and frequency domainExperiments of 3 groups of star-sky images(60 frames per group) show that the algorithm can automatically detect bright line with high accuracy

Abstract: In the passive estimation of mobile target track,the stationary ground platform only provides angular information but no distance information.So,the target flying track must be estimated solely with the existing angular information.A new algorithm,based on uniform acceleration and constant altitude flying mode hypothesis,is presented to estimate the mobile target track according to the measured angular information.A simulation model was built to test the performance of the algorithm.The experimental results show that the estimation algorithm can reduce the angular error to milli-radian or less.

Abstract: The Eccentric-pupil two-mirror collimator is analyzed and its disadvantages are pointed out.The field view of eccentric-pupil two-mirror system is usually small.In order to enlarge field view and to improve image quality,a method of decentering and tilting the secondary mirror is introduced,the primary aberration of the system with decentered and tilted component is simply analyzed using the vector aberration theory.Two designs are given and compared,showing that the method presented could get a good design by enlarging system field and by improving image quality.

Abstract: The status and problems of infrared and radar stealth technology in present are reviewed briefly.New infrared radar compatible stealthy materials being developed in foreign countries,such as doped semiconductor oxide,electric conduction polymer,retinyl schiff base salt,hollow electric particulate coated with metal and nanometer absorbing materials are discussed in detail.Finally,stealth mechanisms and development status of new infrared radar composite stealth coating technology are described.

Abstract: In testing a flying object in the range,the detecting,tracking and estimating of the position of the object are necessary.After analyzing laser tracking and measurement system and infrared search and tracking system's the development now,work principle and development trend,a new data fusion model based on LTMS and IRST was put forward.The fusion model can be used to make data fusion during the flying object test in the range in order to obtain the more precise data about the flying object position.

Abstract: Underlay temperature has an effect drastically on conductivity types in CdTe polycrystalline thin films by CVD method.At the underlay temperature of more than 560℃,the CdTe film is p-type,and at an underlay temperature of less than 520℃,the CdTe film is n-type.In some extent,underlay growth temperature is slower,electron strength is more bigger.Using CVD method,the p-type CdTe film is firstly grown at higher temperature and then the n-type CdTe film is grown at lower temperature to form CdTe homo-junction,the p-n diode is developed for the first time.In addition,a p-type CdTe film is deposited at higher temperature,then exposed to air at room temperature for several weeks to form CdO and TeO2 layer.ITO film is finally deposited on the oxide layer for forming n-ITO/i/p-CdTe hetero-junction.Compared to n-ITO/P-CdTe without oxide layer,the efficiency of EO conversion is significantly improved.

Abstract: On the basis of simplified three-layer model,and in two aspects such as refractive index sensing and step-index fiber grating property,the study on using long-period fiber grating as liquid level sensor in theory was made.When the resonance peak loss as a sensing parameter is measured,the overcoupling did not happen,within a wider range,the linear relationship of the resonance peak loss and the percent of the LPG immersed in liquid would become very well.In contrast,the grating peak loss did not correspond with the percent of immersed liquid as soon as the overcoupling happened.

Abstract: A high intelligent temperature test system is proposedThe digital temperature test sensor DS1820 is applied as a temperature test sensor,AT89C2051 SCM is the center part of the systemAll designs of project,hardware circuit and software of this system are madeThe temperature test on Multi-points is achieved at the same timeThe experiments show that this system is characterized by high intelligence,high-precision,capability of making temperature test on multi-points and compensating functionThe method has a good applicable value to the temperature test