Chinese Version Light学术出版中心
Latest Issue
Issue 6 ， 2018
-
Technology and development of deployable segmented ultra-large-aperture space remote sensors
Abstract：In view of the urgent need of astronomical observation and national defense construction for the ultra-large-aperture space remote sensors, this study systematically researches the technology of deployable segmented ultra-large-aperture space remote sensors. Three kinds of technological routes are presented, including an automatic-deployment segmented system, in-space assembly segmented system and in-space manufacture system, and the basic principle is introduced. Then, the development history and research Keywords：space remote sensor;ultra-large aperture;automatic-deployable segmented system;in-space assembly system;in-space manufacture system- 123
- |
- 25
- |
- 1
Published：2020-07-05 -
Investigation on coherent structure of supersonic film aero-optics based on wavelet packet
Abstract：While a high-speed aircraft is flying in the atmosphere, its optical hood is subjected to severe aerodynamic heating. Supersonic film cooling method can effectively isolate external heating, but the flow structures formed by the supersonic film cooling can cause beam degradation and affect the imaging quality. To investigate the aero-optics of supersonic film cooling, an experimental model was adopted in this paper, with its mainstream Mach number 3.4, designed jet Mach number 2.5, and measured jet Mach num Keywords：aero-optics;supersonic film;coherent structure;wavelet packet- 100
- |
- 15
- |
- 0
Published：2020-07-05 -
Influence of polarization non-orthogonality of Wollaston prism in rapid space angle measuring system
Abstract：To realize the measurement function of a rapid space angle measuring system in a certain range of translation, the polarization non-orthogonality of the two outgoing beams and the angle-measurement error, which is caused by the beam passing through a Wollaston prism in a certain range of the azimuth and incident angle, were studied. First, the coordinate model of the system was established, a ray tracing method was used, and the polarization non-orthogonality of the Wollaston prism at any incident and azimu Keywords：polarization measurement;azimuth measurement;polarization non-orthogonality;Wollaston prism- 74
- |
- 14
- |
- 2
Published：2020-07-05 -
Digital phase-locked data processing for ellipsometric parameter measurements based on photoelastic modulation
Abstract：A system based on photoelastic modulation was analyzed in principle to realize high-speed, high-sensitivity measurements of ellipsometric parameters (ψ and Δ), thereby establishing a low-cost ellipsometric measurement scheme characterized by good repeatability and easy integration. On the basis of the Photoelastic Modulator (PEM) working mode and characteristics of modulated optical signals, a digital phase-locked data-processing scheme, based on Field-programmable Gate Array (FPGA) was designed. FPGA provi Keywords：ellipsometric parameters;ellipsometry;photoelastic modulation;digital phase-locked data processing- 100
- |
- 14
- |
- 0
Published：2020-07-05 -
Generation of tunable annular focal spot using unimorph deformable mirrors
Abstract：In order to generate a tunable annular focal spot, a laser beam shaping method using a unimorph deformable mirror was proposed. The wavefront phase used for generating a target annular focal spot was simulated iteratively by combining diffraction theory and the stochastic Parallel Gradient Descent Algorithm (SPGD). The wavefront phase was then reproduced using a deformable mirror with the feedback of the measured wavefront obtained from a wavefront sensor to realize the shaping of the focal spot. A beam shaping system based on a unimorph deformable mirror with 62 actuators was established. The far-field focal spot was measured using a Charge Coupled Device (CCD) placed at the focal plane of the system. Annular focal spots with different diameters (0.32 mm, 0.4 mm, and 0.6 mm) and widths (0.05 mm, 0.08 mm, and 0.1 mm) were generated experimentally based on the proposed method. This demonstrates that the proposed method is suitable for laser beam shaping.Keywords：adaptive optics;beam shaping;unimorph deformable mirror;Zernike polynomial;stochastic parallel gradient descent algorithm- 72
- |
- 16
- |
- 1
Published：2020-07-05 -
Temperature decoupling and high strain sensitivity fiber Bragg grating sensor
Abstract：Aircraft load parameter testing is essential to ensure flight safety. Fiber grating sensors with several advantages are continuously being developed in the constant attempt to apply them in aircraft load parameter testing. To achieve accurate measurement of structural strain and exclude the effects of temperature, we developed high strain sensitivity and temperature decoupling in a fiber Bragg grating sensor via the fiber grating engraving process. Furthermore, we employed finite element analysis to develop Keywords：strain sensor;Fiber Bragg Grating(FBG);temperature decoupling;linearity;sensitivity;repeatability- 114
- |
- 17
- |
- 5
Published：2020-07-05 -
Mach-Zehneder interference all-fiber sensor for measurement of magnetic field and temperature
Abstract：A Mach-Zehnder interferometer all-fiber sensor for magnetic field and temperature measurement was proposed and experimentally demonstrated for a simplified sensor with improved sensitivity. It combined a Mach-Zehnder modal interferometer and two arms Mach-Zehnder interferometer. A single mode fiber of 1.2 m in length was partly processed into a taper-structured microfiber of 2.7 cm length and a 30.1 μm diameter taper waist. The relationship between the tapering time and the taper waist was investigated. The Keywords：fiber optic sensors;Mach-Zehnder interferometers;magnetic field measurement;temperature measurement;sensitivity analysis- 130
- |
- 33
- |
- 12
Published：2020-07-05 -
Large field-of-view stitching with a single lens and its implementation
Abstract：In a remote target trajectory measurement system, the currently utilized telephoto cameras tend to have too small of a viewing angle to realize stable image capture of remote targets due to limitations of the CCD size. We aim to address the demands of such a system using a large Field-of-V iew (FoV) image collection method that uses a single camera to simulate a 4-camera array by performing a cone rotation. This approach was presented on the basis of a comparison with the current large field-of-view stitchi Keywords：photoelectronic imaging;target capture;field-of-view stitching;cone rotation- 105
- |
- 16
- |
- 1
Published：2020-07-05 -
Influence of fog and aerosol particles' forward-scattering on light extinction
Abstract：In opto-electronic engineering, the light intensity received by the detector includes transmitted light and forward-scattered light. Fog and atmospheric aerosol particles' forward-scattered light increases the transmission, resulting in a measured extinction that is lower than the real amount. Using the Mie scattering theory, based on the atmospheric aerosol particles' size distribution function and an empirical relationship between water content and visibility in fog, the correction factor (CF) of forward-scattering for the extinction of wavelengths in the visible to middle-infrared region was calculated. The influence of parameters such as effective radius, visibility, and wavelength on the forward-scattering CF was discussed in detail. An empirical relationship between the CF and the product of the Field-of-View (FOV) and size parameter was fitted out based on the calculated results, and the mean residual is less than 0.02. The results may be applied in related engineering programs.Keywords：forward scattering;extinction;correction factor;aerosol;fog- 85
- |
- 15
- |
- 8
Published：2020-07-05 -
Integrated curved-surface conformal frequency selective surface radome
Abstract：Frequency Selective Surface(FSS) radomes can effectively improve the stealth performance of flying weapons. However, it is difficult to fabricate frequency selectivity on complex non-expandable surfaces. In this paper, CST simulation software was used to analyze the electromagnetic transmission characteristics of a two-dimensional infinitely large frequency selective surface, which is based on an array of Y-shaped unit structures. A 3-dimensional radome model with a built-in phased array antenna was employe Keywords：Frequency Selective Surface (FSS);radome;laser robot;conformal surface- 104
- |
- 18
- |
- 1
Published：2020-07-05
Modern Applied Optics
-
Optimization design of circular flexure hinges
Abstract：Flexure hinges are the key components of high-precision flexible mechanisms. Their motion precision and range affect the performance of flexible mechanisms. Herein, the flexibility matrix of a circular flexure hinge was derived for optimal design. The flexibility equation of the circular flexure hinge was established using the structure matrix method. The warping and torsional stiffness of the rectangular section was deduced. The approximate equation of torsional flexibility under constrained torsional stat Keywords：circular flexure hinges;restrained torsion;orthogonal experiment;sensitivity;multi-objective optimization- 119
- |
- 32
- |
- 7
Published：2020-07-05 -
Progress on precision glass molding
Abstract：Precision glass molding is a high-efficiency and green optical component manufacturing technology that has seen rapid development in recent years. First, the types of optical components and their demand were discussed, and the problem associated with glass precision molding technology was described. Then, research and development of molded optical components in recent years were reviewed. This research included studies of optical glass materials, a constitutive model of glass material, mold materials, coati Keywords：precision glass molding;mold;simulation;optical glass- 128
- |
- 35
- |
- 8
Published：2020-07-05 -
Jitter measurement of giant steerable science mirror prototype
Abstract：The Giant Steerable Science Mirror (GSSM) is the tertiary mirror of the future large telescope, Thirty Meter Telescope. The characteristics of jitter were analyzed in the time domain and frequency domain, including the relationship between them. By considering the integral precision, frequency domain integration was chosen as the GSSM dithering data processing method. Simultaneously, the applicability of a high-precision encoder and high precision accelerometer for jitter measurement was compared, and the rationality of using the accelerometer was verified. For the internal vibration of the system, the internal forces were measured by the method of Frequency Response Function. Using the above findings, the jitter detection of the GSSM prototype was carried out. The jitter in the mirror is 0.079 7 μm, around the azimuth axis is 14.143 2 mas, around the tilt axis is 20.747 5 mas, and the internal force was 0.003 3 N.Keywords：Thirty Meter Telescope(TMT);tertiary mirror;Jitter measurement;frequency domain integration;accelerometer- 102
- |
- 13
- |
- 1
Published：2020-07-05 -
Micro-feeding characteristics of chromium powder with irregular micron-size particles actuated by acoustic radiation force
Abstract：Stable micro-feeding of micron-size metal powder is one of the core issues in advanced metal parts manufacturing technology, including laser cladding deposition and 3D micro-printing. This study solves the difficult problem associated with the aggregation of irregular shape metal powder, which is unavoidable in existing methods when the feeding mass has a broad range. Such methods are based on the use of a gas-powder feeding system, ultrasonic vibration, pulse inertia force and etc. This study uses acoustic Keywords：laser cladding deposition;metal powder;micro-feeding;ultrasonic standing wave;acoustic radiation force- 94
- |
- 18
- |
- 0
Published：2020-07-05 -
Electrochemical discharge cutting of glass microstructures with rotating electrodes
Abstract：An in-depth study of the method of wire electrochemical discharge machining was carried out for fabricating microstructures on non-conductive brittle materials such as quartz glass and ceramics. First, the method of wire electrochemical discharge machining with a rotating spiral tool was proposed and the slit width model was established. Next, the experimental process was studied, and the influence of many key machining parameters such as the voltage, pulse frequency, duty ratio, and spindle speed on the ma Keywords：electrochemical discharge cutting;quartz glass;rotating spiral tool;high-aspect-ratio microstructures;closed structure- 86
- |
- 17
- |
- 1
Published：2020-07-05 -
Review on thermal design of machine tool spindles
Abstract：The thermal characteristics of machine tools have emerged as one of the most important factors for the performance of high-speed machine tools. The spindle is the key component of machine tools. Thus, the thermal characteristics of the spindle determine the maximum cutting speed and processing accuracy that machine tools can achieve. Controlling the effects of thermal error of machine tools during the spindle design stage is of great importance for improving its thermal characteristics. During the past cent Keywords：machine tool;spindle;thermal design;thermal error;thermal characteristics- 167
- |
- 28
- |
- 14
Published：2020-07-05 -
Optimized design of a micro-motion stage with zero stiffness
Abstract：To address the movement pair gap, assembly error, friction, and wear of the traditional constant-force mechanism, a constant-force micro-motion stage based on a compliant mechanism was presented. The goal of the design was to acquire zero stiffness of the stage by using the positive stiffness of a straight beam and the negative stiffness caused by the buckling behavior of a bistable beam. The stage consisted of a symmetric straight flexible beam, bistable beam, and rigid connection block. The straight flexi Keywords：compliant mechanisms;Constant-Force Mechanism(CFM);pseudo rigid body;zero stiffness;elliptic integral method- 126
- |
- 32
- |
- 4
Published：2020-07-05 -
Study on the effect of rolling shutter sCMOS camera on space debris observation
Abstract：Compared to traditional scientific CCD cameras in which the exposure of each pixel starts and ends synchronously, rolling shutter sCMOS cameras have recently emerged and operate based on an asynchronous start and end time, but with the same exposure period. For space debris observation, it is necessary to evaluate the effect on the measurement accuracy due to the asynchronous exposure among the sCOMS pixels. Firstly, the working sequence and max delay of certain sCMOS cameras were tested, and a correction f Keywords：sCMOS;rolling shutter;space debris;astronomical positioning- 105
- |
- 26
- |
- 3
Published：2020-07-05 -
Fabrication of substrate and film in MEMS using CMP
Abstract：The chemical and mechanical polishing (CMP) process has already been applied to micro-electro-mechanical systems (MEMSs), and it has become an indispensable and key technology for developing high-quality micro-and nano-devices. The introduction of zonal backing pressure and end point detection during the CMP process can not only guarantee a within-wafer nonuniformity of less than 5%, but it can also effectively minimize polish defects, including dishing and erosion. The application of CMP to MEMS is more ch Keywords：Chemical & Mechanical Polishing(CMP);MEMS;adjustment of zone backing pressure;end point detection;surface roughness- 113
- |
- 19
- |
- 1
Published：2020-07-05 -
Assembly system for miniature optical parts and experimental study
Abstract：The process of precisely assembling a prism and a phototube onto the resonator of a ring laser gyroscope is called beam-coupling. This is a key procedure in the production of ring laser gyroscopes. Traditional manual beam-coupling is unable to satisfy the demands of ring laser gyroscope assembly, due to the inefficiency and lack of stability associated with the process. An automatic beam-coupling assembly system is therefore developed based on the analysis of beam-coupling principles. This method involves t Keywords：precision assembly;micro optical parts;signal processing;vision detection- 98
- |
- 21
- |
- 3
Published：2020-07-05
Micro/Nano Technology and Fine Mechanics
-
Blurred star restoration based on improved Radon transform and sparse prior
Abstract：A New blurred star spot restoration algorithm was proposed to improve the accuracy of the centroiding of star of the star navigation system under dynamic conditions in this paper. Firstly, the star blurring model was analyzed, and the conclusion that the accuracy of the centroiding of the star increased with the signal to noise ratio(SNR) was obtained. The recovery of the blurred star was divided into coarse and fine steps for the carrier angular motion and vibration. The effect of noise on Radon transform Keywords：motion blur;star restoration;Radon transform;sparse prior;iterative blind restoration- 66
- |
- 14
- |
- 1
Published：2020-07-05 -
Automatic focusing of micro-vision detection system of Mycobacterium tuberculosis smear
Abstract：Most of the medical smears of Mycobacterium tuberculosis have the characteristics of sparse and uneven content and more impurities in the observation area. There are some problems while observing the Mycobacterium tuberculosis smears to acquire image automatically, such as difficulty in distinguishing definition, low efficiency and focusing evaluation function invalid. To improve the efficiency and accuracy of automatic inspection, an automatic micro-vision detection system was developed independently to re Keywords：auto-focusing;micro vision;focusing function;focusing weight coefficient;image processing- 254
- |
- 18
- |
- 2
Published：2020-07-05 -
Collapsing simplification of triangular mesh based on genetic algorithm
Abstract：To solve the problem that the triangular mesh model which deals with large amount of data will bring great pressure to the computer, a triangle collapsing simplification method based on genetic algorithm was proposed in this paper. In this method, the gravity of the triangles was first derived, the new coordinates were calculated by using the three coordinates of the gravity and the three initialized step lengths, the vertex population was obtained through repeating the above operation several times, the mi Keywords：mesh simplification;triangle collapsing;genetic algorithm;triangular quality- 135
- |
- 15
- |
- 6
Published：2020-07-05 -
TSDF map building based on hybrid loopback detection and closed-loop optimization
Abstract：Because the original Truncated Signed Distance Function (TSDF) model only considers the correlation of adjacent time, the error will inevitably accumulate to the next time, and it is impossible to build a globally consistent map In order to establish the dense 3D map of large scenes in real time and accurately, the TSDF model was improved in this paper. First, a camera pose model and weighted fusion 3D point truncation information model were established to represent the surface of the created object. Second Keywords：random ferns;Truncated Signed Distance Function(TSDF);closed-loop optimization;pose graph optimization- 83
- |
- 13
- |
- 2
Published：2020-07-05 -
Design of liquid crystal-deformable mirror adaptive optical system data acquisition and process software
Abstract：In order to improve the working efficiency of adaptive optical system researchers and meet the development needs of adaptive optics systems to woofer-tweeter multi-wave front correctors, a design method of adaptive optical system control software with convenient modification, full-functions and modularization was studied to adapt to the continuous updating and replacement of the laboratory equipment and avoid the problems caused by constantly updating and modification of the software during the experiment. Keywords：adaptive optics;liquid crystal wave front corrector;deformable mirror;software design;modulation- 104
- |
- 18
- |
- 2
Published：2020-07-05 -
High precision limb height calculation of ultraviolet forward spectrometer of TianGong-2
Abstract：TianGong-2 ultraviolet forward spectrometer is a new type of spectrometer to detect the vertical distribution of atmospheric trace gases in the middle atmosphere of the world. In view of the geometric imaging characteristics of the spectrometer, a high precision calculation method of atmospheric altitude was proposed in this paper. Firstly, the observation vector in the sensor coordinate system was calculated. Secondly, the transformation matrix of the sensor coordinate system to the geocentric fixed coordi Keywords：TianGong-2;ultraviolet forward spectrometer;limb height;coordinate transformation- 76
- |
- 16
- |
- 2
Published：2020-07-05 -
A general linear imaging modeling method for space unstability targets and parameter optimization of linear laser radar
Abstract：With the advantages of laser ranging and linear imaging, the linear imaging radar is applied to precisely measure long distance space unstability targets. The captured linear images can be used for both motion estimation and 3D measurement of space targets. In order to simulate the data acquisition of space unstability target with different plane resolution linear imaging radar, this paper presented a general linear imaging modeling method for space unstability targets based on the imaging mechanism of the Keywords：space unstability targets;linear imaging radar;parameter optimization of linear imaging radar;linear image- 97
- |
- 14
- |
- 3
Published：2020-07-05 -
Infrared-visible video registration with matching motion trajectories of targets
Abstract：In order to realize accurate and automatic infrared-visible video registration, a novel registration method was proposed based on matching the motion trajectories of targets. First, the top pixel of each foreground was tracked by using the multi-target tracking algorithm based on KCF. In this way, the trajectory of each target was obtained. Then, the normalized motion orientation descriptor and the normalized motion magnitude descriptor were established for each trajectory. The stepwise constraint matching Keywords：infrared image;visible image;image registration;multi-target tracking;feature matching- 103
- |
- 17
- |
- 5
Published：2020-07-05 -
Unsupervised hierarchical human target infrared image segmentation through fuzzy correlation
Abstract：The multilevel fuzzy entropy has been adopted as a segmentation method for the human target infrared image. However, it has some problems that the partition number needs to be designated manually, and the global partition manner result in the accuracy of entropy measurement being influenced by background interference and the precision of segmentation being reduced. To address these problems, an unsupervised hierarchical segmentation based on fuzzy correlation strategy was proposed. To ensure the region homo Keywords：machine vision;infrared image segmentation;superpixel;fuzzy correlation- 76
- |
- 16
- |
- 2
Published：2020-07-05 -
Application of multi-level information fusion for wear particle recognition of ferrographic images
Abstract：Aiming at the insufficient utilization of the heterogeneous information in wear particle recognition of ferrographic images, a method for wear particle recognition based on multi-level information fusion was proposed. First, the binary filtering was conducted for the binary segmented ferrograhpic image, and the red, green and blue components of color ferrographic images were extracted to obtain the color filtered ferrographic images. Then, the experimental ferrographic images were collected as processing ob Keywords：ferrographic image;image filtering;information fusion;wear particle recognition- 86
- |
- 19
- |
- 7
Published：2020-07-05
Information Sciences
Loading...
0