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Issue 2 ， 2017
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Deformation law of optical resonant cavity under random vibration environment
Abstract：In view of the negative effects of resonant cavity deformation due to complex environments on performance of laser gyroscope, the slight deformations of mirror in three directions, which are 0.342 5", 0.349 4" and 0.215 0", was simulated by ANSYS when the resonant cavity was under the function of standard random vibration spectrum (gRMS=6.6 g). Employing the theory of matrix optics, the deformation of the diaphragm was obtained quantitatively. Then, the deformation law of optical resonant cavity affected by Keywords：laser gyroscope;random vibration;optical resonant cavity;deformation law of resonator;finite element analysis- 109
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Published：2020-07-07 -
Parallel-alignment and correction of two displays in three-dimensional measuring system of specular surfaces
Abstract：Aiming at the inaccurate parallel-alignment of two display screens in three-dimensional (3D) measuring system of specular surfaces, this paper proposes a method for generating deformed fringes by software to be equivalent to the exact parallel-alignment of two display screens. The machine vision technology was employed to calibrate external parameters of the two displays, based on which the deformed fringes equivalent to parallel-alignment two display screens were produced by software programming. A camera Keywords：three-dimensional morphology measurement;specular surfaces measurement;parallel and alignment of two display screens;deformed fringe;error of root-mean-square- 79
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Published：2020-07-07 -
Measurement of magnetic bead concentration based on laser transmission method
Abstract：Magnetic beads are widely used in biological experiments, such as immunoassay and cell separation. The detection of magnetic concentration is profound to the evaluation of experimental results. Therefore a magnetic beads concentration measuring system with dual optical path based on laser transmission method was presented. The concentration of magnetic beads was determined by measuring the ratio of the intensity of incident laser to the intensity of the transmitted laser. A series of magnetic bead suspensio Keywords：optical measurement;laser transmission method;magnetic bead concentration;double optical path;exponential model- 72
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Published：2020-07-07 -
Calibration devices for band range of echelle spectrometer
Abstract：In order to ensure full waveband range of echelle spectrometers, a set of calibration devices was designed. The principle, range and resolution of the calibration were discussed and studied. First, tolerance analysis of optical elements in the echelle spectrometer was performed, and the principle and process of auto spectrum calibration were introduced. Taking the focusing mirror as the adjusting object, the requirement of adjusting resolution was given according to the usage of the CCD image. Furthermore, a set of calibration device was designed, and the calibration resolution of the devices was calculated and experimentally verified. The results show that the azimuth calibration resolution is up to 0.006 25°, the resolution of the pitching direction is up to 0.006 25° and the resolution of the front and rear direction is up to 0.005 mm. The calibration devices can adjust the 10 pixels band offset to the normal reception range of the CCD, thus ensuring the full spectral band range of the spectrometer.Keywords：echelle spectrometer;auto spectrum calibration;band range- 85
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Published：2020-07-07 -
Design and construction of autonomous real-time position prototype based on multi-polarized skylight
Abstract：In order to improve the reliability and real-time performance of polarized skylight navigation, a independent position method based on multi-polarized lights was proposed and a navigation prototype was constructed. The prototype included five polarized light sensors, which were arranged in multi-direction array for the detection of polarization information in multiple directions of the sky. With the polarization information optimized and converged, the sun spatial position information was calculated more re Keywords：polarization optics;real-time position;skylight polarization;autonomous navigation;LabVIEW- 73
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Published：2020-07-07 -
Measurement of fluorescence life time of single up-conversion nanoparticle
Abstract：In order to characterize the photon luminescence properties of up-conversion nanoparticles (UCNPs), a system to measure fluorescence life time of single nanoparticle was established based on a custom-built two-photon microscope scanned with a pair of galvo-mirrors. First, a sample of mono-disperse UCNPs was imaged by the two-photon microscope. Then, the exact location of each nanoparticle was precisely determined through the single molecule fluorescence localization algorithm. The laser was focused on the n Keywords：optical microscopy;up-conversion nanoparticles;fluorescence life time;two-photon microscope- 78
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Published：2020-07-07 -
Calibration of polarized effect for time-divided polarization spectral measurement system
Abstract：Aiming at the problems of polarizing effect in short wave infrared and measurement deviation in the polarization spectral measurement system built in lab, a system calibration model was established and a method to measure the correction coefficients of the model was proposed, thus the polarizing effect was calibrated precisely. Firstly, the main problem of the regular time-divided polarization spectral measurement system was described and the origin of the polarizing effect was analyzed. An ASD spectrometer Keywords：polarization remote sensing;polarization spectra;polarizing effect calibration;polarization transmission theory;correction coefficient;ASD spectrometer- 69
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Published：2020-07-07 -
Influence of local oscillator power on sensitivity of coherent detection of space balance detector
Abstract：To explore the relationship between the local oscillator power and the coherent detection sensitivity in free-space coherent optical communications, the mathematical model about the influence of the local oscillator power on the sensitivity of coherent detection was established, and the effect of local oscillator power on the sensitivity of coherent detection under different parameters was simulated. The coherent detection sensitivity testing system was set up by using the high-speed and large-area space-co Keywords：coherent optical communication;balanced detector;noise suppression;sensitivity;local oscillator power- 87
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Published：2020-07-07 -
Optimized design of baffle in satellite laser communication system
Abstract：In order to enhance the available probably ratio and to improve the temperature level and difference in a specific geostationary earth orbit (GEO) laser communication system, the structure of baffle was optimized. The baffle was uniformly installed grids on internal surface on the basis of GEO orbit external thermal flux characteristics, without the decrease of laser communication signal property. Firstly, the impact of grid and baffle inner wall on the solar view factor of the primary mirror was discussed Keywords：laser communication;baffle;grid;temperature level;temperature difference- 111
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Published：2020-07-07 -
Thermal ablation law of laser irradiation on nylon materials under tangential airflow
Abstract：To study the influence of tangential flow on laser damage of slow small targets, a research on the effect of tangential airflow on laser ablation in the process of laser irradiation on a typical low slow small target material of nylon 66 was achieved experimentally and in simulation. The physical model of laser ablation on nylon 66 was established. Based on the model, the temperature field distribution and ablation morphology of nylon materials for 4 s and 1.5 s laser irradiation with and without tangential Keywords：laser ablation;laser irradiation;thermal ablation;nylon 66;tangential airflow;ANSYSsimulation- 74
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Published：2020-07-07 -
Ten-dimensional scanning system of scanning xenon lamp solar simulator
Abstract：In order to simulate the annual solar irradiation of a satellite in orbit, thus verifying and optimizing the ability of entire satellite to stray light suppression, the paper analyzes on-orbit imaging condition of optical payload and designs a scanning xenon lamp solar simulator, which has a ten dimensional scanning system including 7-dimension scanning mirror and 2-dimension folding mirror and 1-dimension sample. The controlling formula of all the mechanisms in terms of attitude and location are deduced. Then the simulation of irradiation in space environment is completed. The results show that the solar simulator scans an area of 1 700 mm×2 700 mm with the azimuth angle from -90° to + 90° and the pitch angle from -29° to 42.5°. Their angular accuracies are up to 0.2° and 0.1° separately, and the position accuracy is better than 10 mm. Thus the scanning solar simulator can be applied to the accurate simulation of year-round solar irradiation condition for some satellite in orbit.Keywords：scanning solar simulator;stray light measurement;xenon lamp;scanning system- 67
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Published：2020-07-07
Modern Applied Optics
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Subsurface damage prediction for optical Hard-brittle material in fixed abrasive lapping
Abstract：The correct prediction of subsurface damage (SSD) depth in lapping is an important basis for setting processing parameters. According to the lapping features of fixed abrasive, two typical optical hard-brittle materials (MgAl spinel and quartz glass) were selected to establish their respective two-dimensional discrete element models by using the discrete element method (DEM) and to analyze the impact on SSD (crack) depth of optical hard-brittle materials by above processing parameters. After that, an angle Keywords：optical hard brittle material;fixed abrasive lapping;discrete element method;subsurface damage- 96
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Published：2020-07-07 -
Research on pose distribution algorithm of FAST feed support system
Abstract：In order to achieve high-accuracy trajectory tracking at feed end of Five-hundred meter Aperture Spherical radio Telescope (FAST) support system and to prevent the force over-limit of supporting cables, the pose distribution algorithms of target end by the star-frame of feed support system and A-B rotator were studied in the article. Firstly, according to the mechanism characteristic of the feed support system, combining the time-varying barycenter and the back illuminating strategy applied in feed cabin, a Keywords：FAST;radio telescope;pose distribution;time-varying barycenter;back illuminate- 70
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Published：2020-07-07 -
Characteristic calculation and experiment of CFRP lenticular tape spring
Abstract：Subject to space development requirements such as lightweight, miniaturization and simplication, the carbon fibre reinforced plastic (CFRP) lenticular tape spring (LTS) was practically designed through theoretical analysis, and its buckling characteristics was studied by combining finite element analysis and experiments. The bending moment computing formula for CFRP LTS under different anisotropic materials was deduced according to bending theory of thin shells, and the sensitive parameters that affect LTS' Keywords：Space deployable structures;lenticular tape springs;carbon fibrereinforced plastic;buckling;finite element model;bending moment- 116
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Published：2020-07-07 -
Design and experiment of Y-type flexure hinge
Abstract：In order to design a large deformation of flexure hinge with high precision and simple structure and to promote the motion precision of parallel platform and the life of elements, a Y-type flexure hinge was proposed in the article. Firstly, made analysis and study of the rotation center, installation method and stroke requirements of flexure hinge by application of ANSYS and ADAMS. Secondly, processed the flexure hinge by using CNC machine. Thirdly, measured the axis drift of flexure hinge by using the 3D o Keywords：flexure hinge;axis drift;parallel- 80
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Published：2020-07-07 -
Multi-mode dynamic atomic force microscope system
Abstract：Dynamic atomic force microscope (AFM) is able to measure the surface topography of objects by detecting the changes of resonance state of the cantilever. Through the detection on three factors of such resonance state, amplitude, phase and frequency, dynamic AFM could be divided into three kinds of working modes, which are amplitude feedback mode, phase feedback mode and frequency feedback mode, and such feedback modes have different scanning characteristics. Based on the higher-order resonance characteristi Keywords：Dynamic AFM;amplitude feedback;phase feedback;frequency feedback;high-order resonance- 121
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Published：2020-07-07 -
Analysis and experiment on Controlled Moment Gyro disturbance transmission model
Abstract：The vibration disturbance generated by Control Moment Gyro (CMG) has adverse effects on precision and stability of the attitude control system in spacecraft and there is still lack of effective methods to conduct mathematic modeling and analysis on it. Due that there is large structure difference between high-speed rotors and low-speed components of CMG, and it is hard to make mathematic modeling with unified methods, a system modeling method combined analytical modeling with test identification was established in the article to study the disturbance transmission mode of CMG, and an experiments was conducted to verify it. The results show that the disturbance transmission model proposed is correct and able to verify the conclusion that "unbalance vibration of high speed rotor is the main disturbance resource in CMG".Keywords：CMG;high-speed rotor;low-speed component;test identification;disturbance characteristics- 86
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Published：2020-07-07 -
Numerical modeling of mechanical performances of aerostatic bearing with orifice-type restrictor
Abstract：To discuss the impact of bearing parameters, including the restrictor size, air film thickness and air supply pressure, on mechanical performance of the orifice restricted aerostatic bearing. Firstly, taking the orifice restricted hydrostatic thrust bearing with cylindrical chamber for an example, carried out a numerical simulation and analyzed in the bearing clearance flow field, in which the orifice size, air chamber size, air supply pressure and air film thickness were taken as the design variables, esta Keywords：aerostatic bearing;mechanical performance;orthogonal experimental design;radial basis functions model- 91
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Published：2020-07-07 -
Application of bidimensional empirical mode decomposition in error evaluation for engineering surface texture
Abstract：In consideration of the disadvantages such as boundary distortion and poor adaptability in the method for microstructure surface error separation, the bidimensional empirical mode decomposition (BEMD) with adaptive time-frequency resolution capacity was put forward and applied to three-dimensional engineering surface error separation; at the same time, Riesz transform was utilized to construct monogenic signal, calculated overall frequency characteristics of the signal and improved the termination criterion Keywords：bidimensional empirical mode decomposition;3D surface topography;error evaluation;termination criterion;Riesz transform- 79
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Published：2020-07-07 -
On middle frequency error distribution of large telescope based on structure function
Abstract：To better evaluate and distribute the middle frequency errors of large telescope, structure function was put forward for such purposes in this paper. Firstly, we carried out a derivation in basic property of the structure function and compared it with traditional root mean square (RMS), which indicates its capability of representing different-scale errors; secondly, conducted an analysis on the statistical property difference of system wavefront under different evaluation scales, which indicates that system Keywords：large telescope;normalized Point Source Sensitivity;middle frequency error;structure function- 62
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Published：2020-07-07 -
Intelligent optimization design for MB-CVT electro-hydraulic control system
Abstract：Purpose:to improve the fuel economy of vehicles with MB-CVT, a control algorithm based on sliding mode extremum seeking (SMES) theory and an integrated control method based on combination of SMES control and traditional clamping force control were put forward. Method:designed the integrated control system based on a combination of SMES control and traditional hydraulic control, and established a mathematical model with nonlinearity and discreteness; analyzed the special curvilinear relationship between the Keywords：Automotive Engineering;Continuously Variable Transmission;Sliding Mode Extremum Seeking;Electronic hydraulic- 79
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Published：2020-07-07 -
Inverse depth parameterized attitude estimation for non-cooperative spacecraft
Abstract：Purpose:to achieve on-orbit servicing or off-orbit removal of non-cooperative targets in space, such as inactive satellites, space debris, especially slowly rotating targets, accurate measurement of relative attitude between the tracking aircraft and target aircraft is necessary. Method:firstly, used inverse depth parameterization to represent the coordinate value, angular altitude, azimuth angle and depth information of the camera, which could effectively complete the monocular vision attitude estimation u Keywords：non-cooperative target;inverse depth parameterization;attitude estimation;EKF;RANSAC- 63
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Published：2020-07-07
Micro/Nano Technology and Fine Mechanics
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Simplification method for feature preserving of efficient triangular mesh model
Abstract：Considering that some triangular mesh models are inconvenient for storage, analysis and display due to enormous data volume, a simplification algorithm for triangular collapsed mesh combining with mesh refinement was put forward. In this method, the modified coordinates for three vertexes of the triangle to be collapsed were determined by using the surface subdivision method, and the position of the folding point was preliminarily determined in accordance with the modified coordinates; then the Laplacian co Keywords：mesh simplification;triangle collapse;Laplacian coordinate;- 93
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Published：2020-07-07 -
Accurate image locating combining deep convolution network with SURF registering
Abstract：For small-scale image locating in a large image, an accurate locating method combining deep convolution network with SURF registering was introduced. The large-scale image was divided into several small reference images, and the feature of such reference image set was extracted to form a feature library by combining the deep convolution network and Similar Local Sensitive Hashing (SLSH); on the basis of the feature library, a two-stage method that carrying out accurate SURF registering after retrieval of mu Keywords：deep convolution network;image retrieval;SURF registering;accurate locating- 78
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Published：2020-07-07 -
Sub-pixel image registration based on super resolution reconstruction
Abstract：Considering the low precision of low-resolution image used for the registration process, a sub-pixel image registration method based on super resolution reconstruction was put forward. Firstly, 10 times down-sampling was carried out in the image sequence with 1~9 pixel displacement to obtain an image sequence with 0.1~0.9 sub-pixel displacement; then, a mathematical model was built in accordance with the image acquisition process, and Maximum A-Posteriori (MAP) method was used to carry out super resolution Keywords：super resolution reconstruction;phase correlation;sub-pixel;image registration- 80
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Published：2020-07-07 -
GPS-based binocular camera calibration and space coordinate reconstruction
Abstract：To alleviate the dependence of binocular camera on high-accuracy target during calibration, achieve precise calibration of camera parameters and implement high-accuracy reconstruction of space coordinates, a GPS-based method for binocular camera calibration and space coordinate reconstruction is introduced, in which GPS instead of 2D or 3D targets is used to carry out the camera calibration.Through arbitrarily moving the GPS at the shooting site, multiple images with GPS are shot by calibrated camera; based Keywords：computer vision;binocular camera calibration;camera model;GPS coordinate transformation;space coordinate reconstruction- 86
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Published：2020-07-07 -
Adaptive fast initial attitude estimation for inflight loitering munition
Abstract：To solve the problem of initial attitude estimation for inflight loitering munition in the absence of reference attitude, a fast initial attitude estimation algorithm for adaptive reference vector weight (AFCF) was put forward based on the Attitude and Heading Reference System (AHRS) designed by adopting low-cost magnetic, angular rate and gravity MARG sensor. First of all, a fast error calibration method for three-axes sensor was put forward; Then, the attitude estimation was carried out by adopting the fa Keywords：loitering munition;initial attitude estimation;complementary filter;optimal vector estimation- 75
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Published：2020-07-07 -
Local linear enhancement of luminance histogram of color remote sensing image
Abstract：Aimed at actual problem of low energy of remote sensing image, a local linear image enhancement method of luminance histogram was put forward to improve visual effect of color remote sensing image. Firstly, HSI transformation was performed on color remote sensing image described by RGB model to separate component H, S and I effectively; secondly, traditional histogram equalization was implemented to luminance I component and gained equalized gray level mapping curve; then, by taking image gradient as object Keywords：remote sensing;image enhancement;HSI model;histogram equalization- 89
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Published：2020-07-07 -
Multispectral image segmentation by fuzzy clustering algorithm used Gaussian mixture model
Abstract：As the traditional segmentation algorithms are difficult to realize accurate segmentation for high resolution multispectral image, this paper proposed a kind of fuzzy clustering segmentation algorithm of multispectral image on the basis of Gaussian mixture model (GMM). GMM was adopted to define the dissimilarity measure of pixels to the clusters.As the proposed algorithm has the ability of high-precision fitting data statistics distribution, it can effectively eliminate the negative impact of noise on segme Keywords：image segmentation;high resolution multispectral image;dissimilarity measure;gaussian mixture model;prior probability- 89
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Published：2020-07-07 -
Research on target prediction algorithm of shipboard photoelectric tracking equipment
Abstract：When shipboard photoelectric tracking equipment traces target more than 100 km away from it, because of disturbance of barrier, target is often lost from field of view.Under this condition, memory track algorithm shall be adopted to predict location of target at future time to re-find target. Conventional CA and CV models ignore residual error when predicting target, and memory track time is short, which causes insufficient accuracy of target predicted. In consideration of above problems, Kalman target pred Keywords：three degree of freedom model of ship swing self-stability;CV model;CA model;Kalman model- 67
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Published：2020-07-07 -
Video foreground detection of tensor low-rank representation and spatial-temporal sparsity decomposition
Abstract：A detection method based on Tensor Low-Rank Representation (TLRR) and spatial-temporal sparsity decomposition was proposed to detect foreground targets in video sequences. Since foreground in video sequence has sparsity inherently besides spatially continuous and temporally continuous, this paper put forward spatial-temporal sparsity-inducing norm to perform deep research on property of foreground. Original video was decomposed in tensor representation formed by tensor low-rank representation method, line i Keywords：video;foreground detection;low rank;spatial-temporal sparsity decomposition;tensor low-rank representation;inexact augmented Lagrange multiplier- 95
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Published：2020-07-07 -
Velocity estimation of GEO debris space-based observation image and dynamic programming detection
Abstract：An improved dynamic programming method based on position predication was proposed in the paper to quickly detect dim and small debris from the space-based observed images on GEO band. Firstly, after analyzing the observed data, we found that different GEO debris have same movement velocity in images, after further data fitting, we obtained a mapping model between the velocity of image debrits and sub-star latitude of observation satellite and proposed a method to estimate the debris velocity in space-based Keywords：GEO debris;object detection;dynamic programming;velocity estimate;position prediction- 79
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Published：2020-07-07 -
Time-delay estimation of ultrasonic echo signal besed on normalized cyclic cross-correlation
Abstract：Traditional ultrasonic echo time-delay estimation algorithm is studied in the background of Gauss Noise, while in actual working condition ultrasonic echo includes not only Gauss Noise but also impulsive noise (α noise with stable distribution), which will invalidate traditional algorithms. In actual application, in order to solve the above problem, a new ultrasonic echo time-delay estimation method under mixed noise, especially the background containingα noises, was proposed, called time delay estimation a Keywords：ultrasonic echo;time-delay estimation;normalized cyclic cross-correlation;α stable distribution noise- 61
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Published：2020-07-07
Information Sciences
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