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Issue 8 ， 2017
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Optical imaging technology of JL-1 lightweight high resolution multispectral remote sensing satellite
Abstract：In order to realize light-weight design as well as multi-spectral and multi-mode imaging with high resolution of JL-1 optical remote sensing satellite, advanced integration design method and payload centric concept were adopted, thus indexes, scheme and key techniques of JL-1 were given and in-orbit multi-mode optical imaging was achieved. The mass of JL-1 is approximately 450 kg, the payload ratio reaches 40% and the attitude maneuver speed of JL-1 can be 2.1 (°)/s, which enable stereo and piece imaging. With the capacity of 800 GB on-board FLASH storage and double X band 600 Mbps telemetry, JL-1 satellite can collect up image data over nearly 150, 000 km2 daily. The satellite was launched in 2015, and can collect images with resolutions of 0.72 m (PAN) and 2.88 m (MS) in 656 km sun synchronous orbit, which meet the requirements of commercial movements.Keywords：optical remote sensing;platform and payload integration;JL-1;multi-mode imaging;lightweight high-resolution- 132
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Published：2020-07-07 -
Phase laser ranger based on quadrature modem and frequency reduction
Abstract：A novel laser range finder method based on the quadrature modem and least square method was investigated to improve the accuracy and reliability of traditional portable phase laser range finders. A reflector was employed for inner and outer optical paths. After amplitude modulation of laser intensity by the quadrature modulation method, the echo signal was mixed with modulation signal and passed through a low-pass filter to reduce the frequency, thus simplifying phase detection and improving solution accura Keywords：laser ranging;quadrature modem;least square method;overdetermined equation;ambiguity resolution- 106
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Published：2020-07-07 -
Improvement of laser damage resistance at surface of DKDP crystal by laser conditioning process
Abstract：In view of damage characteristics of crystal surface, the effect of laser conditioning process on the laser induced surface damage threshold of DKDP crystals was determined by combining raster scan pre-exposure and real-time damage event imaging technique. By simulating dynamic process of different defects exposed to intense nanosecond laser pulse, the mechanisms of the effect of laser conditioning process on rough and well polished surfaces were discussed separately. The results show that laser damage dens Keywords：laser damage;laser conditioning;damage threshold;laser conditioning effects;dopted deuterium KDP (DKDP)- 100
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- 17
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- 4
Published：2020-07-07 -
Optical system design and stray light suppression for medium-high orbit autonomous navigation system based on stellar refraction
Abstract：In order to realize full-time-running and high-precision stellar refraction autonomous navigation of medium-high orbit satellites based on single star sensor with wide field of view, and to fix the suppression problem of strong stray light lead by illuminated earth in field of view, an internally occulting stellar refraction sensor and its stray light suppression were researched. Through the establishment of the model of stellar refraction sensor and the simulation test environment of stellar refraction nav Keywords：optical system design;autonomous navigation;navigation by stellar refraction;internally occulting sensor;stray light suppression- 114
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- 26
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Published：2020-07-07 -
Self-calibrated spectral radiance standard source
Abstract：Aiming at the demand of high-precision space-based optical quantitative remote sensing, a self-calibrated spectral radiance standard source which employs Digital Micromirror Device (DMD) was developed. The light source has two working modes. In narrow-band mode, it is calibrated by CAS spectroradiometer and Gershun radiometer. In broad-band mode, it is used for calibration of the spectral radiance responsivity of ground-based or space-based remote sensing instruments. An spectral radiance standard source co Keywords：radiometry;remote sensing;radiance calibration;source;Digital Micromirror Device(DMD)- 120
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- 21
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- 4
Published：2020-07-07 -
Developement of alternating light field space-time coupling type displacement measuring system
Abstract：Regarding the restriction of precision ruling process difficulty on the measurement precision, a linear space-time coupling displacement measuring system was designed, taking an alternating light field as the measuring medium. The measuring system coupled four orthogonal alternating light fields and four orthogonal sinusoidal light transmitting surface into electrical traveling wave signal, thus achieving high precision displacement measurements. Through analysis of the measuring principle of the system. Th Keywords：displacement measurement;alternating light field;space-time coupling;travelling wave synthesis;error analysis- 77
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- 16
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Published：2020-07-07 -
Optical system design of compound multi-point measurement velocity interferometer
Abstract：In order to measure velocities of explosion loading surface driven by blast waves, a compound velocity interferometer was introduced. The illumination laser from fiber array was projected onto the target surface through a telecentric optical imaging system. Only several points on the target were illuminated, which got the utmost out of laser power. The illumination beam had so small numerical aperture that the illumination spot size kept constant while the target moving within 10 mm. A taper fiber array wit Keywords：detonation wave;velocity interferometer;telecentric optical system;taper fiber- 103
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- 3
Published：2020-07-07 -
Analysis on influence parameters of cell sorting using optical pressure difference technology
Abstract：In this paper, the finite volume method was adopted to establish cross cell separation model, and a cell screening simulation method was proposed based on light pressure difference for analysis of influence factors of cell screening in microfluidics. Based on laminar flow, fluid flow, particle tracking and wave optics theories, a cross type optical particle separation model was established by finite element analysis. Using light pressure difference technology, various factors affecting the separation of cel Keywords：cell sorting;optical fiber;optical radiation pressure;optical pressure difference;numerical simulation- 61
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- 14
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Published：2020-07-07 -
Effects of vacuum annealing on optical and microstructure properties of zinc sulfide thin film
Abstract：The effect of vacuum annealing on the optical and microstructural properties of zinc sulfide (ZnS) thin films deposited by ion beam evaporation (below 550℃) was investigated. The analysis of optical and microstructure characteristics of the thin films show that, the microstructure of ZnS films is cubic-like structure, and has a critical characteristic turning point at a wavelength of 337.5 nm. With the increase of annealing temperature, the variation trend of the extinction coefficient on both sides of the Keywords：ZnS thin film;refractive index;extinction coefficient;vacuum annealing;crystallographic structure- 103
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Published：2020-07-07 -
Application of improved quantum evolutionary algorithm in design of broadband EUV multilayer
Abstract：In order to further improve the efficiency and accuracy of quantum evolutionary algorithm (QEA) in the design of broadband Extreme Ultraviolet (EUV) multilayers, the gradient information of evaluation function was applied to improve QEA, and then the improved quantum evolutionary algorithm (IQEA) with defined evolution directions was adopted in the design of broadband multilayers. A comparison between the QEA and IQEA in the design of broadband Mo/Si multilayer was given, and the results show that the IQEA Keywords：film optics;design of multilayer coatings;improved quantum evolutionary algorithm;broadband EUV multilayer- 91
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Published：2020-07-07 -
Fabrication of anisotropic and hierarchical structures using femtosecond laser printing capillary force assisted self-assembly
Abstract：A method for preparation of designable anisotropic and hierarchical structures using femtosecond laser printing and capillary force assisted self-assembly was proposed. First, a periodic micro-pillar arrays template was fabricated by localized femtosecond laser polymerization. The micro-pillars were immersed in developed solution for about 40 min and subsequently exposed in the air. During the evaporation of developed solution, micro-pillars was self-assembled into periodic anisotropic architectures with th Keywords：laser fabrication;femtosecond laser;capillary force self-assembly;anisotropic structure;hierarchical structure- 91
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Published：2020-07-07 -
Preflight spectral calibration of hyperspectral carbon dioxide spectrometer of TanSat
Abstract：In order to realize spectral calibration for TanSat's hyperspectral Carbon Dioxide Spectrometer (CDS), a calibration system was established and relevant methodology such as design of the system, data acquisition and algorithms of data processing and etc was investigated. Based on the sounding principle, CDS's spectral requirements were presented. Design of calibration system and the adopted equipments was described. Then after the scheme of Orbiting Carbon Observatory's spectral calibration was compared, th Keywords：remote sensing;TanSat;carbon dioxide spectrometer;spectral calibration;instrument line shape(ILS)- 96
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- 25
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Published：2020-07-07 -
Application of genetic algorithm in the design of off-axis four-mirror optical system
Abstract：As existing optical design software depends on the selection of an initial structure, a solving method of initial structure for four-mirror optical systems based on genetic algorithm was proposed to obtain the initial structure with good image quality and special structural configuration. The aberration of a coaxial four-mirror optical system was analyzed according to primary aberration theory. The objective function composed of primary aberration coefficient with weight and constraint conditions of structu Keywords：optical design;off-axis four-mirrors system;genetic algorithm;rectangular field- 87
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- 27
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- 6
Published：2020-07-07
Modern Applied Optics
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Development of a body fluids pretreatment instrument for aerospace medicine
Abstract：Pretreatment microfluidic chip and instrument for aerospace medicine were designed and developed based on microfluidics technology to realize astronauts' body fluids (saliva, urine, blood, etc) medical assay in microgravity environment. The chips integrated with micropumps and microvalves, can automatically implement total pretreatment processes including sample introduction, different kinds of pretreatments and sample delivering out through the instrument operation. At the same time, the chips integrated a Keywords：Aerospace medicine;pretreatment of body fluid;micro-fluidic chip;degassing;mix- 74
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- 16
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- 3
Published：2020-07-07 -
On-line monitoring of WEDM-LS surface roughness by utilizing time-frequency characteristics of AE signal
Abstract：Aiming at the problem that monitoring of Wire Electrical Discharging Machining-Low Speed (WEDM-LS) process is difficult because of high temperature, narrow kerf and other factors, Acoustic Emission (AE) was adopted to implement on-line monitoring of WEDM-LS process with adjustable duty ratio pulse. Firstly, AE signal was decomposed into eight independent frequency bands by energy spectrum algorithm of wavelet packet, respectively being W1~W8 and frequency reduces in sequence; then energy characteristic of a Keywords：WEDM-LS;acoustic emission;surface roughness;wavelet packet- 101
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- 16
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- 2
Published：2020-07-07 -
Design of anti-shock vibration isolation for detector module of space optics load
Abstract：Solution method to set vibration isolator between lens module and head frame was proposed to avoid damage of detector after Z-direction shock test in whole machine of wide angle aurora imager. Firstly, vibration isolation scheme was determined as passive local vibration isolation; then vibration isolator design of metal rubber was accomplished in aspects of material seletion, rigidity determination and installation way design, etc. Modal analysis and simulation analysis of shock load response were conducted Keywords：Wide angle aurora imager;whole machine;detector module;vibration isolator of metal rubber;shock load;vibration damping- 82
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- 15
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- 4
Published：2020-07-07 -
Prediction model of core rod diameter of hard and brittle material processed by ultrasonic assisted grinding
Abstract：Ultrasonic assisted grinding is an effective way for trepanning the core rod, but the brittle fracture is the main manner to remove the hard and brittle materials during ultrasonic assisted grinding, leading to dimension error between the rod diameter and the inner diameter of the grinding wheel. Aiming at the above problem, based on the theory of indentation fracture mechanics and the kinematic analysis of diamond grains on the grinding wheel, a prediction model of the rod diameter was established, during Keywords：hard and brittle material;ultrasonic assisted grinding;diameter prediction;dimension error of core rod- 93
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- 18
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- 1
Published：2020-07-07 -
Hysteresis compensation and composite control for Piezoelectric actuator
Abstract：Fast Steering Mirror (FSM) is the core part in terminal fine aiming system of inter-satellite laser communication. As the driving device for FSM, Piezoelectric actuator's (PEA) hysteresis characteristics seriously affect FSM's position accuracy, and therefore have adverse influence on stability of inter-satellite communication link. In order to solve this problem, a modified Prandtl-Ishlinskii (MPI) model was proposed to describe PEA. On this basis, a feed-forward linearization approach for PEA was presente Keywords：fast steering mirror;laser communication;fine aiming system;Piezoelectric actuator;hysteresis characteristics;modified PI hysteresis model;composite control- 136
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- 24
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- 9
Published：2020-07-07 -
Design for vertical liquid hydrostatic slide with nano-scale precision
Abstract：In order to satisfy maching accuracy requirements for aerospace key parts, this paper designed and formulated a vertical liquid hydrostatic slide with nano-scale precision. The research was carried out from aspects of slide structure, key parts and tolerance design method of slide. Firstly, according to the design requirements for vertical slide with super-precision, unequal flow structure and control method was introduced to realize overall design of slide structure. In this scheme, all liquid hydraulic oi Keywords：liquid hydrostatic slide;super-precision vertical slide;unequal flow structure;precision test- 105
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- 18
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- 1
Published：2020-07-07 -
Design and fabrication for micro-lens array with high fill factor in integral imaging system
Abstract：Aimed at current problems in design and fabrication of micro-lens, a kind of design and fabrication method for micro-lens array with large size and high fill factor was introduced. It has been successfully applied to displaying system for 3D integral imaging based on phone screen. According to theory of integral imaging under focal-plane model, relation between parameter for micro-lens array and displaying key parameters of integral imaging was established, and aperture and focal length for lens array film Keywords：design and manufacturing of micro-lens array;3D integral imaging;micro-lens array;high fill factor;advanced manufacturing technology- 111
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Published：2020-07-07 -
Precision drive and position control of non-resonance piezoelectric stack linear motor
Abstract：In order to realize long stroke and high precision displacement control in scopes such as optical-mechanical structure, integrated circuit and so on, a precision hybrid amplification driving circuit was designed by using non-resonance piezoelectric inchworm stack linear motor based on the high voltage power operational amplifier. Resolution and amplitude-frequency characteristic of driving circuit were verified by Bode diagram gotten by theoretical analysis and experiment. Taking FPGA as core processor and Keywords：non-resonance piezoelectric ceramic;hysteresis inverter model;long stroke and high precision displacement control;FPGA;compound control algorithm- 84
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Published：2020-07-07 -
Low power control of magnetic bearing combined by repetitive control and positive integral feedback
Abstract：A control method combined by repetitive control and positive integral feedback was proposed to restrain system power consumption of magnetic bearing. Firstly, mathematical model of magnetic bearing system was established. Frequency characteristics of current noise caused by gravity, rotor imbalance and displacement sensor noise were analyzed, and found the current noise could be divided into two types of direct component and harmonic component. Controller conditions of eliminating direct current were deduce Keywords：magnetic bearing;direct component;harmonic component;low power consumption;repetitive control;positive integral feedback- 89
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- 13
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- 1
Published：2020-07-07 -
Design of multi resonant U shaped slots nano-antenna and their absorption properties
Abstract：Solar collection is an effective mean to solve the problem that network energy of wireless sensor is limited. A multi-resonant nano-antenna array of coupling and symmetric U-shaped slots was proposed for solar collection, aiming at problems such as that solar collection of traditional photovoltaic battery was easily limited by environment and illumination time as well as problem of narrow absorption bands. 4 symmetric U-shaped slots were etched in silver dielectric substrate to obtain this antenna unit stru Keywords：energy collection;U-shaped slots nano-antenna;surface plasmon;finite difference time domain;absorption feature- 73
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- 7
Published：2020-07-07 -
Compensation of angular indexing error for precision turntable
Abstract：A compensation method for angular indexing error was introduced based on sparse decomposition to correct the angular indexing error caused by the eccentric and tilt of circular gratings installment in a precision turntable. First, the effect of circular grating installed eccentric and tilt on the angular indexing error was analyzed. Next, according to the characteristics of different orders of error in measuring error of circular grating angle, a compensation model of angular indexing error was built based Keywords：precision turntable;angular indexing error;sparse decomposition;error compensation- 121
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- 16
Published：2020-07-07
Micro/Nano Technology and Fine Mechanics
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Adaptive denoising for laser detection signal of shell thickness based on variational mode decomposition
Abstract：The adaptive denoising of shell thickness signal by Variational Mode decomposition method was proposed aimed at the influence of noise on laser detection precision in the measurement process by a double laser displacement sensor.The discrete Hellinger distance between intrinsic mode functions was used to obtain the optimal modal number. Firstly, the VMD algorithm was introduced into adaptive filtering process of laser signal; excessive decomposition, insufficient decomposition and energy leakage problems of Keywords：shell thickness;thickness measurement;laser measure ment;signal denoising;variational mode decomposition;Hellinger distance- 70
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- 15
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- 2
Published：2020-07-07 -
Multi-scale guided filter and its application in image dehazing
Abstract：With combining guided filter and lifting wavelet effectively, a multi-scale guided filter was proposed to smooth the details of a color image and to keep the edges of the image unambiguous. The lifting wavelet was used to decompose the color image in multi-scale. It means that the image was decomposed into a low frequency subband and a plurality of high frequency subbands. In the reconstruction process of the lifting wavelet, the low-frequency information of each scale was smoothed by the guide filter and t Keywords：guided filter;lifting wavelet;multi-scale guided filter;image dehazing- 112
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- 5
Published：2020-07-07 -
Fifth-degree strong tracking cubature Kalman filter for real-time orbit determination by multiple terminals
Abstract：To improve real-time determination accuracy of hand-held terminal for a satellite impulse maneuver orbit and to decrease the sensibility of orbit determination precision for an initial filtering value, a Fifty-degree Strong Tracking Spherical Simplex-radial Cubature Kalman Filter(5-STSSRCKF) method was proposed. N-dimensional regular simplex transformation group and moment matching method were used to deduce fifth-degree spherical simplex-radial cubature criterion, then the criterion was embedded into the S Keywords：handheld terminal;real-time orbit determination;fifth-degree spherical simplex-radial cubature rule;strong tracking- 96
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- 11
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Published：2020-07-07 -
Digital binning method for CCD pixels and its applications
Abstract：Scientific grade frame-transfer Charged Coupled Devices(CCDs) in a space-borne differential optical absorption spectrometer usually use a Pixel Binning (4-Binning)method to improve its Signal-to-Noise Ratios(SNRs). It is only suitable for the quite weak radiation. To allow the spectrometer to be used for stronger radiation and to expand its detection ability, a digital pixel binning method, 4-AVR, was designed. Comparing to the 4-Binning method, this 4-AVR method brings the attenuation of CCD signals. There Keywords：space-borne spectrometer;differential absorption spectrometer;CCD;pixel binning;data correction- 93
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- 14
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- 4
Published：2020-07-07 -
Global optimized hazed image reconstruction based on polarization information
Abstract：Aimed at the serious degradation problem of camera images under strong scattering environments of fog, haze and so on, a reconstruction method of image defogging was proposed to reduce the influence of fog and haze environment on the image quality. On the basis of the polarization imaging model, the global optimized reconstruction parameters were obtained by estimating every pixel's parameters. Then, polarization filtering method was used to estimate the equivalent degree of polarization image of atmospheri Keywords：strong scattering environment;information of polarization;image reconstruction;global optimization- 101
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- 9
Published：2020-07-07 -
Robot vision system for keyframe global map establishment and robot localization based on graphic content matching
Abstract：To solve kidnapping problem and similar object interference at the time of indoor localization of robots, a visual system with graphic contents matching function was designed to make robots extract constructed indoor global map of key frame sequence effectively and to realize self-localization.Since the main interferences influencing graphic content matching was image distortion caused by visual angels of robots and displacement, a graphic content matching method was designed by image distortion modeling an Keywords：robot vision;robot self-localization;keyframes global map;graphic content matching;image distortion- 110
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- 7
Published：2020-07-07 -
Modeling and simulation for target detection in polarization scene
Abstract：There is complex mutual interference among targets, background reflection and aerosol radiation under a real environment when optical remote sensing technology is used to detect targets in complex scene. This paper explores the technology of modeling and simulation for targets in a polarization scene. The optical theories and polarization model basis were introduced, and numerical simulation and analysis for Priest-Germer model were implemented. The simulation software for the detection of targets in the po Keywords：optical remote sensing;polarimetric imaging;bidirectional reflection distribution function;Priest-Germer model;simulation- 141
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- 15
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Published：2020-07-07 -
Application of block nonlinear weighted in optical angle measurement of headlamp tester calibrator
Abstract：An automatic measurement scheme based on image processing techniques and a high-precision electronic control turntable was designed to improve disadvantages of repetition performance degradation in traditional optic axial angle measurement systems due to human factors. The distribution characters of illumination light spots and light intensity in the system were analyzed. A feature point extraction algorithm for the optimal nonlinear weighting was proposed based on image area segmentation.According to the l Keywords：optical angle measurement;feature point extraction;dual-threshold segmentation;nonlinear weighting- 123
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- 1
Published：2020-07-07 -
Calibration of camera extrinsic parameters based on monocular visual with GPS assistant
Abstract：An extrinsic parameter calibration method with differential GPS(Global Position System) assistant based on monocular visual ORB-SLAM(ORB-Simullaneous Location and Mapping) was proposed aimed at extrinsic parameter calibration problem of a robot vision system. Nonlinear least square models of extrinsic parameter calibration were established based on analyzing the similarity relationship between monocular visual ORB-SLAM and GPS positioning data. The initial solution of model was obtained by three-point metho Keywords：extrinsic parameter calibration;ORB-SLAM;least squares model;RANSAC;LM- 89
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Published：2020-07-07
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