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Issue 6 ， 2017
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Development of airborne ocean modified Dyson hyperspectral imager
Abstract：Aiming at development requirements of marine environment, ocean color and other fields, an airborne improved Dyson spectral imaging system with wide field of view and large relative aperture was designed. According to optical properties of marine environmental pollution, albedo value of different targets was used to estimate the signal-to-noise ratio (SNR) of target signal for expanding the working waveband of the hyper-spectral imager to the ultraviolet. A detector with large pixel size and an imaging syst Keywords：remote sensing;hyperspectral imager;estimated calculation of SNR;ultraviolet waveband;large pixel size;large relative aperture- 86
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Published：2020-07-07 -
Measurement of physical therapy efficiency of traditional Chinese medicine by laser speckle blood flow imaging
Abstract：In order to accurately evaluate curative effect of traditional Chinese medicine therapy, a detection method based on Laser Speckle Blood Flow Imaging (LSBFI) was proposed according to relative theories of qi and blood and human skin microcirculation in traditional Chinese medical meridians. The degradation of image signal to noise ratio attribute to body shaking and other factors of detected object in the process of detection was researched and improved, and the stability of imaging system was verified thro Keywords：laser techniques;laser speckle blood flow imaging;physical therapy;blood perfusion index;moxibustion- 77
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Published：2020-07-07 -
Evaluation of imaging performance for electroluminescence defect detector
Abstract：Technical indexes such as resolution, image uniformity, and image display were analyzed and compared, aiming at the inconsistency of current imaging performance of electroluminescent (EL) defect detector in combination with electroluminescent principles of Photovoltaic (PV) modules. A rapid and effective on-line detection technique for PV modules was proposed. Corresponding detection and assessment devices were developed, and related test experiments were implemented. The experiment results show that for a Keywords：photovoltaic module;electroluminescence;defect detection;resolution;line pair- 82
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Published：2020-07-07 -
Measurement errors of ultraviolet photocathode radiant sensitivity
Abstract：Photocathode radiant sensitivity is an important index to measure response capability of ultraviolet detector, thus its accurate measurement is necessary. Herein, measurement methods of photocathode radiant sensitivity for some type of ultraviolet detector were built, and practical measuring equipment of ultraviolet photocathode radiant sensitivity was constructed. Influencing factors for the measurement of ultraviolet photocathode radiant sensitivity by the equipment were analyzed emphatically. In addition Keywords：ultraviolet detector;photocathode radiant sensitivity;narrow band filter;optical grating monochromator;measuring error- 101
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Published：2020-07-07 -
Transverse load sensor based on optical fiber extrinsic Fabry-Perot interferometer with high sensitivity and temperature self-compensation
Abstract：In order to improve the sensitivity of optical fiber EFPI sensors, a novel EFPI sensor structure was proposed, and its characteristics of temperature and transverse load were studied. Firstly, the structure and fabrication of the optical fiber EFPI sensor with its edge coated with palladium-gold were introduced. Then, the temperature sensing model of fiber optic EFPI coated with palladium-gold was established, and the relationship between change of cavity length and pressure was obtained in theoretical simu Keywords：optical fiber sensor;optical fiber extrinsic Fabry-Perot interferometer;coated palladium-gold film;transverse load;temperature self-compensation- 80
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Published：2020-07-07 -
Performance verification of staring laser active imaging system
Abstract：A staring laser active imaging system based on APD arrays and splitting beam illumination was designed, in order to study the imaging performance of the imaging system on non-cooperative target in target tracking. The relationship between laser echo power and target distance was analyzed theoretically, and the result shows that the echo power of targets beyond 200 m is less than 1 μW. In order to improve operating distance of the system, a trans-impedance amplifier OPA657N with high gain-bandwidth was adopt Keywords：laser active imaging;staring type;target tracking;non-cooperative target- 126
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Published：2020-07-07 -
Object-side based differential axial measurement based on parallel confocal microscopy
Abstract：The differential confocal microscopic imaging technology can obtain high axial measurement accuracy. However, existing differential confocal microscopic imaging techniques mainly employed to laser scanning confocal microscopy can not satisfy requirements of non-contact online and on-site measurement for workpieces during micro-nano machining processes. Axial measurement methods that were applicable to parallel confocal technology were proposed based on the analysis that differential confocal microscopic ima Keywords：3D topography measurement;object-side based differential confocal method;parallel axial measurement;non-contact;Digital Micro-mirror Device(DMD)- 72
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Published：2020-07-07 -
Alignment of focus-adjustable off-axis reflective optical system
Abstract：A space interactive measurement and datum transmission system with high accuracy was proposed, aiming at precise alignment problem of off-axis reflective optical system. Therefore the highly accurate angle location of focusing angle and systemic optical axis was realized. The diameter of the system was 450 mm, and focus-adjustable range was from 0.5 km to infinity. After accurate positioning of focusing angles, only wave aberration of off-axis three-mirror optical system in infinite position needed to be adjusted to satisfy requirements, and the wave aberrations of all focus position in the system could be guaranteed to accord with design requirements, thus improving adjustment efficiency greatly. The experimental results show that the wave aberrations of the system in infinite position, 1.5 km, 2.5 km and 0.5 km are 0.1λ, 0.11λ, 0.5km and 0.2λ respectively, which are all better than design requirements.Keywords：off-axis optical system;reflective optical system;optical alignment;focus-adjustable;datum transmission- 95
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Published：2020-07-07 -
Testing of stray light irradiance at exit of lens hood for star sensor
Abstract：Facing the urgent requirement of stray light suppression for the star sensor in orbit, stray light irradiance at the exit of the lens hood of a star sensor was determined quantitatively. Based on micro fiber optic spectrometer, two-dimensional high-precision displacement table and solar simulator, a stray light test platform which scans point-by-point was established. With the effective integration of radiation measurement software and motion control software, system integration test software was developed. Keywords：star sensor;lens hood;stray light suppression;irradiance distribution;data processing;error analysis- 106
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Published：2020-07-07 -
Calibration of integrated x-ray diffraction efficiency for elliptically curved quartz crystal
Abstract：Elliptically curved crystal spectrometers exhibit large width of spectral measurement, high resolution of energy spectrum and other features, thus can be fully used in the experimental research on "SG Ⅱ" Inertial Confinement Fusion (ICF). Taking advantage of X-ray tube of the copper (Cu) target for the X-ray diffractometer, and seleting appropriate thickness of filter disc to restrain Cu-Kβ ray and bremsstrahlung, parameters of integral diffraction efficiency and full width at half maximum of rocking curve Keywords：Inertial Confinement Fusion(ICF);integrated diffraction efficiency;calibration;elliptically curved crystal;X-ray diffractometer- 101
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Published：2020-07-07
Modern Applied Optics
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Microstructure characteristics of laser in situ synthesis high Niobium Ti-Al intermetallic compound coating under heat treatment
Abstract：In order to improve the high-temperature oxidation resistance and further promote the engineering application of titanium alloy in high temperature and complex service environment conditions, high niobium Ti-Al intermetallic compound oxidation resistance coatings were prepared on BT3-1 titanium alloy surface by laser in situ synthesis process. Microstructure of the composite coating and interface was optimized through a self-designed heat treatment process according to the defects in the coating. The phase Keywords：laser in situ synthesis;heat treatment;Ti-Al intermetallic compounds;composite coating;microstructure- 59
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Published：2020-07-07 -
Optimal measurement area of articulated coordinate measuring machine calculated by ant colony algorithm
Abstract：A method to solve the optimal measurement zone was proposed to improve the measurement accuracy of the articulated coordinate measuring machine. According to the measurement model of the articulated coordinate measuring machine, the error model of the articulated coordinate measuring machine was established on the basis of angle measurement error of the circle grating encoder. 6 random numbers of the articulation rotation angle could be obtained by taking advantages of Monte Carlo theory; and the measuremen Keywords：Articulated coordinate measuring machine;ant colony algorithm;the optimal measurement zone- 91
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Published：2020-07-07 -
Two-freedom image stabilization institution of large stroke of bidirectional actuation
Abstract：Aiming at the design requirement of bidirectional dynamic long stroke in optical image stabilization system, a kind of scalable and bidirectional piezoelectric actuator was proposed, and two-freedom image stabilization institution was designed based on this piezoelectric actuator. This piezoelectric actuator was made up of a shrinkage triangle amplification mechanism and a stretching triangle amplification mechanism. These amplification mechanisms can provide enough stroke for piezoelectric platform.Meantim Keywords：Optic image stabilization;two-dimension platform;linear piezoelectric actuator;displacement amplification institution- 90
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Published：2020-07-07 -
Research status and prospect of vortex-induced vibration micro-fluid energy harvester
Abstract：With gradually expansion of the application field for micro-nano devices, micro energy technology have been paying more and more concerns and attentions by domestic and oversea researchers, among which micro fluid energy harvester based on the vortex-induced vibration(VIFEH) has become a hotspot. First, the operational principle of the VIFEH was introduced and the typical structure, theory, features and application situation of VIFEH were generalized. Then, the relative technology development and research p Keywords：Fluid energy;vortex-induced vibration;energy harvester;piezoelectricity- 118
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Published：2020-07-07 -
Research on spectral characterization of superlubricity graphite surface
Abstract：In order to seek for a new ideal method to solve friction, abrasion and other interfacial effect problems in micro/nano electro mechanical system, the influence of graphite contact interfaces on graphite superlubricity and the sources of resistance were researched. First, the electron beam lithography, ion beam etching and other micro-processing methods were used to prepare microscale graphite mesa, and graphite surface with superlubricity was obtained by using micro-nano manipulator to shear the graphite m Keywords：Super lubrication;spectral characterization;Raman spectrum;infrared spectrum;graphite- 59
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Published：2020-07-07 -
Research on friction compensation based on interval analysis theory
Abstract：A new-type Stribeck model and interval analysis theory were used to conduct friction compensation in servo mechanism. First, aiming at defects of Stribeck friction model such as nonlinearity, huge computation, going against the design of the control and others which are subject to be linearization, a kind of linearized Stribeck model was proposed. Then the parameter identification method of interval theory was introduced and simulation was performed to verify the effectivity of interval analysis theory. Fin Keywords：Stribeck;frication compensation;controller;interval analysis theory- 63
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Published：2020-07-07 -
Design of focusing mechanism with high precision and small volume for visible light television system
Abstract：A high-precision and small-volume focusing mechanism was designed to realize the distance and temperature focusing functions of the visible light television. Based on the optical design results and functional demands of the visible light television, the main technical indices of the focusing mechanism were proposed. Then, precise linear motor and exact linear guides were chosen, platform base with high stiffness was designed in detail, and formula of focusing distance were calculated, according to the techn Keywords：Visible light television;optical system;focusing platform;high-precision;small-volume- 61
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Published：2020-07-07 -
Technological parameter optimization and quality effects on solid-liquid phase abrasive flow polishing
Abstract：To study the effect of abrasive flow polishing on internal surface of heteromorphic coelomopore and polishing deburring of micro-holes, the function relationship between each technological parameter of abrasive flow and processing quality in the process of polishing was discussed. Common rail pipe that is a type of non-straight pipe was taken as research object, and numerical simulation study was implemented for abrasive flow polishing process, the influence of each technological parameter on abrasive flow Keywords：Common rail tube;SiC volume fraction;viscosity-temperature characteristics;turbulent viscosity;mathematical model- 78
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Published：2020-07-07 -
Pore forming results of controllable ultra-light structured parts by selective laser melting
Abstract：In this paper, the addictive manufacturing of automatic ultra-light structural metal parts with controllable parameters, such as porosity, was researched. Through block shaped parts and a part with complicated structure, the pore forming results of controllable ultra-light structural parts manufactured by selective laser melting was analyzed. Influences of forming technology on porosity of ultra-light structural parts were mainly discussed. The result is showed: through numerical calculation of computer, bl Keywords：Additive manufacturing;selective laser melting;ultra-light structure;metal parts- 97
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Published：2020-07-07 -
Application of interface preprocessing in opto-mechanical system dynamics analysis and surface shape optimization
Abstract：In order to solve the problems of large calculation data volume and failure caused by the post processing mode of interface program in the process of optical machine system dynamics analysis and surface shape optimization, the pre-processor was introduced into the opto-mechanical interface processing for integrated analysis and optimization of opto-mechanical system. First, the node area weighting factor and annular Zernike polynomial were introduced to settle non-orthogonality of standard Zernike polynomia Keywords：Preprocessing of optical machine interface;optical machine system dynamics;surface shape optimization;node area weighting factors;annular Zernike polynomial- 157
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Published：2020-07-07 -
Design and experiment analysis for micro needle-cylinder discharge chip integrated by open-type ion source and micro pump
Abstract：The LIGA (Lithographie, Galvanoformung, Abformung) technology was adopted to design and process a micro needle-cylinder discharge structure chip, by doing this, system integration of open-type ion source and micro air pump was realized. The micro discharge structure was composed of pin electrode, upper cylinder electrode and bottom cylinder electrode which were fabricated by copper electroplating. There were two types of needle-cylinder clearances, separately were 1 mm and 2 mm. Under the condition of room Keywords：Micro discharge structure;corona discharge;ion source;mini air pump- 98
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Published：2020-07-07 -
All-sky automation star identification algorithm based on ordered star points set
Abstract：In order to improve the success rate and robustness of all-sky automation star identification under star position error and pseudo stars, a novel star identification is proposed, which utilizes ordered star point set as star pattern. First, stars in certain range are classified by kNN algorithm as the center is a specified star, then based on the graph theory, with the nearest navigation star as reference, the classified stars are ordered in a sequence by the clockwise order. Hence, a star pattern under str Keywords：Star pattern identification;success rate;robustness;ordered set of star points;position error;pseudo star points- 103
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Published：2020-07-07
Micro/Nano Technology and Fine Mechanics
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Research on cognitive user's time allocation algorithm on the mobile scene of primary users
Abstract：Traditional cognitive radio techniques mainly aim at the primary user and cognitive user in static. For the past few tears, the research on the mobility of the user has become a hot research topic, the cognitive network is widely used in multimedia access technology, and the protocols of multimedia access technology are mostly based on the allocation of time. This paper focuses on time allocation method of cognitive users under mobile scenarios of primary users. In this paper, we firstly construct the time Keywords：cognitive radio;primary user mobility;user capacity;transmission time- 50
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Published：2020-07-07 -
Interactive reassembly of fractured fragments based on feature points of contour line
Abstract：A novel interactive method which can assemble the fractured fragments was proposed based on the surface pattern breakpoint and feature points on contour line of the fracture fragments. Firstly, the geometric structure and contour line were obtained by generating Laplacian lines, and pattern breakpoints and feature points were selected. Then, the combination for distance of feature points to pattern breakpoint, the inner angles and distance of adjacent feature points can produce feature descriptors which determine the adjacency relationship between fragments. All the pairwise points were searched through matching function. Finally, the quaternion outputed the rigid transformation matrices, then two fragments were precisely aligned based on optimal rigid motion through exhaustive search. The experimental results indicate that the reassembly time with 13% to 16% saved and result errors are less than 1 mm.The method can reassemble fractured fragments efficiently and successfully.Keywords：virtual restoration;interactive algorithm;Laplacian lines;Doulas-peucker;rigid transformation- 90
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Published：2020-07-07 -
GPS-supported 3D reconstruction of UAV images based on robust Lie-algebraic rotation averaging
Abstract：As the sensitivity of the rotation averaging method for the Least Squares to the gross error would lead to inaccurate solution of image rotation parameters, a robust rotation averaging method was proposed. Taking advantages of the mapping relations between the Lie group and Lie algebra, the linear equation of rotation averaging iteration resolving was deduced by simplifying the product operation of rotation matrix to subtraction operation in Lie algebra; then the globally uniform rotation optimum solution w Keywords：Unmanned Aerial Vehicle (UAV);three-dimensional(3D) reconstruction;Lie algebra;L1 norm;rotation averaging;Global Positioning System (GPS)- 91
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Published：2020-07-07 -
Reconstruction of super resolution for noise image under the sparse representation
Abstract：In order to complete the super-resolution reconstruction of noise images, a reconstruction method of noise images was introduced based on sparse representation, which could complete image de-noising and super resolution reconstruction simultaneously. Firstly, block size division was made for sample images and low-resolution images and the sample database was established. Secondly, the image degradation model was built and the way of weighted average was used for similar samples to represent the output image Keywords：super resolution;noise image;sparse representation;weight model- 94
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Published：2020-07-07 -
Radial neighbor feature with compensate code star pattern recognition algorithm
Abstract：A fast radial featured star pattern recognition algorithm with compensate code was proposed to solve star model that constructed by traditional radial featured star pattern recognition algorithm could be vulnerable to position noise, lead to low recognition rate. This algorithm adopt byte vector form to construct radial feature vector, meanwhile neighbor angle distance and compensate information were added to feature vector to reduce guide star catalogue capacity and to effectively increase stability and re Keywords：star pattern recognition;compensate code;radius feature;fast matching- 54
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Published：2020-07-07 -
Initial registration of point clouds using camera pose estimation
Abstract：Based on the mathematical model of camera pose estimation, a feature point detection method of camera images before and after movement was proposed to obtain relative posture matrix of camera before and after movement, which can solve initial registration problem of point clouds derived from machine vision. Firstly, the estimation model of camera pose was introduced, including essential matrix, rotation matrix and translation matrix. Secondly, the detection, description and matching of feature points for SU Keywords：initial registration;pose estimation;SURF operator;binocular vision;structured light- 78
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Published：2020-07-07 -
Corrected fast SIFT image stitching method by combining projection error
Abstract：Aiming at the problems of limited instantaneity in current image stitching methods, a fast image stitching method through combining feature points detection on part of image with correction of projection error in the overlapping area in the process of image stitching was proposed. Firstly, the scope of the feature detection for the method only focused on part of image blocks in the overlapping area of the image which were needed to be stitched for obtaining information of feature points for Scale Invariant Keywords：Image stitching;Scale Invariant Feature Transform (SIFT);correction for projection error;quality evaluation- 186
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Published：2020-07-07 -
Saliency analysis of near infrared star images and detection of fixed stars
Abstract：Aiming at the condition that the centroid calculated by the fixed star skew the authentic centroid caused by bright spot which is generated by radiation effect of near-infrared star images, a stable method to extract background and significance of the fixed star was proposed in consideration of differences between background and objectives for near-infrared star images. In saliency detection, SLIC was used to implement superpixel calculation, and separation of near-infrared star image background and fixed s Keywords：Near-infrared;centroid detection of fixed stars;significance;consistency of background- 63
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Published：2020-07-07 -
Improved speckle reducing anisotropic diffusion for ultrasound image filtering
Abstract：In order to eliminate the block effect and the blurring details of images caused by the traditional speckle reducing anisotropic diffusion, an improved anisotropic diffusion algorithm was proposed, in which a new diffusion coefficient constituted by the hyperbolic tangent function was used to replace the original diffusion coefficient, thus can wipe off the block effect in the uniform region of images. A damping factor was used to guide the speed of attenuation in the no-uniform area, thus reserving the det Keywords：ultrasound image;speckle noise;anisotropic diffusion;image filtering- 68
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Published：2020-07-07 -
Action recognition based on adaptive mutation particle swarm optimization for SVM
Abstract：The action recognition framework based on local features was established to improve the recognition ability of human behavior in video sequences. The algorithms related to the framework were researched through spatial temporal features extracting and encoding and parameters optimization of SVM classifier. Firstly, the feature descriptors composed of Histograms of Oriented Gradients (HOG) and Histograms of Optical Flow (HOF) were used to describe Space Time Interest Points (STIP) achieved by the Harris 3D de Keywords：human action recognition;Adaptive Mutation Particle Swarm Optimization (AMPSO);Space Time Interest Points (STIP);feature coding;Support Vector Machine (SVM)- 88
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Published：2020-07-07 -
Astronomical calibration and spatial registration of multi-sensor
Abstract：In order to achieve the spatial registration of multi-sensor on the same platform for astronomical observation, a camera calibration and attitude measurement algorithm was proposed based on the star image simulation which includes four steps. Firstly, according to star observation model and star catalogue, the simulated star image was produced in order to transform constellation features into image features. Then, based on the invariant collinearity of quadrilateral diagonal, image features between the obse Keywords：astronomical calibration;spatial registration;star pattern recognition;attitude measurement;star image simulation- 64
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Published：2020-07-07
Information Sciences
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