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Issue 9 ， 2017
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Optimization of spectral channel of transfer radiometer
Abstract：As channel selection acts an important influence on calibration accuracies in the calibration of imaging spectrometers by transfer radiometer, herein MATLAB language was adopted to compile a merit function, which was used as the evaluation standard of inversion accuracy of the spectral curve of a blackbody at a temperature of 3000k. The MATLAB genetic algorithm and the pattern search algorithm toolbox were employed to solute the minimal value of function that was the optimal spectral channel distribution of Keywords：imaging spectrometer;transfer radiometer;optimal selection channel;inversion accuracy;the genetic algorithm- 59
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Published：2020-08-13 -
Influence of test equipment pose error on dividing error measurement based on autocollimator
Abstract：In order to improve the measurement accuracy of dividing error of encoders, the principle and method to measure dividing error by using angular polygon and autocollimator were introduced, and the error sources were analyzed. According to the measurement principle, coordinate systems of angular polygon and autocollimator were established. Utilizing the method of coordinate transformation, precise mathematical models were deduced for indicating the relationships between dividing error and misalignment errors, Keywords：angular surveying;error analysis;coodinate transformation;dividing error;angular polygon;autocollimator- 64
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Published：2020-08-13 -
Femtosecond laser holograpic fabrication of hydrogel cell scaffold
Abstract：In order to achieve rapid fabrication of hydrogel cell scaffolds, the computer-aided holographic method was employed into the traditional femtosecond laser two-photon processing. The generation of hologram as well as the influence of its parameters on the processed cylinder microstructure was studied. Firstly, Ring-shaped Bessel-beam holograms were generated according to the Bessel light wave equation and its transmission function, of which the parameters' effect on the size and quality of ring structure wa Keywords：femtosecond laser;two-photon processing;Bessel beam;hydrogel;cell scaffold- 136
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Published：2020-08-13 -
Vernier effect based on optical fiber Sagnac interference loop with two angle shift spliced polarization maintaining fibers and its application on temperature sensor
Abstract：An optical fiber Sagnac interference loop with two angle shift spliced polarization maintaining fibers was designed and fabricated to realize high-sensitivity temperature sensing. In the optical fiber Sagnac loop, two sections of polarization maintaining fibers were spliced with an intersection angle of 45° between their fast axes. The interference spectrum formula of the Sagnac interference loop by the Jones matrix was deduced theoretically. The influence of main parameters of the formula on the output cha Keywords：optical sensing;temperature sensor;sagnac interferometer;optical vernier effect;oolarization maintaining fiber- 101
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Published：2020-08-13 -
Development of
Φ 1032 mm optical window for shipboard photoelectric tracking systemAbstract：Aiming at the protection of reflective main optical system for shipboard photoelectric tracking systems, an 1 m size optical window and its frame were designed, manufactured and tested. Firstly, the performance and strength of the window material were analyzed. According to the influence of the difference between internal and external pressures, the weight and the rotational inertia force on the window, the minimum thickness was determined. Then, the effects of deformation of optical window and frame on opt Keywords：photoelectric tracking system;optical window;Optical Path Difference(OPD);reflective optical system- 184
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Published：2020-08-13 -
Thickness measurement of rotary parts with double laser under unknown relative position condition
Abstract：In order to measure the thickness of large-sized hollow rotating parts, a non-contact measuring method based on double laser displacement sensors was proposed. With unknown relative position between rotating parts and the double laser displacement sensor, the measuring errors induced by the installed eccentricity of rotating pieces as well as the non-collinear relationship between dual-sensor optic axis and the origin were analyzed. Meanwhile, mathematical model between dual-sensor signals and the thickness Keywords：non-contact measurement;laser technique;thickness measurement;revolving body;relative position- 69
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Published：2020-08-13 -
High precision processing of quadrature signals for homodyne interferometer
Abstract：In order to improve the reliability and repeatability of phase counting and subdivision of quadrature signals for homodyne interferometers, a high accuracy error compensation algorithm for quadrature signals combined error correction with phase-based counting and subdivision was proposed based on the Heydemann correction model of quadrature signals and digital signal processing technology. Matrix manipulation based on the least square method was adopted to calculate compensation parameter initials of quadra Keywords：homodyne interferometer;quadrature signals;error compensation;counting and subdivision;measurement accuracy- 79
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Published：2020-08-13 -
Measurement of underwater acoustic wave using optical distributed acoustic sensing based on space difference
Abstract：To detect weak underwater acoustic signal over large areas, an optical Distributed Acoustic Sensing(DAS) scheme based on space difference of Rayleigh backscattering was presented. In this scheme, Rayleigh backscattered light with phase changes induced by the acoustic signal along a single-mode sensing fiber was split and fed into an imbalanced Michelson interferometer. Adjusting the path difference of the imbalanced Michelson interferometer, the Rayleigh backscattered light interference of different lengths Keywords：optical fiber sensing;Rayleigh backscattering;space difference;imbalanced Michelson interferometer;acoustic phase sensitivity- 70
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Published：2020-08-13 -
Ranging and positioning method using wireless solar blind ultraviolet
Abstract：In order to solve the problem of positioning in UAV flight and landing guidance scene, this paper presented a ranging and positioning method based on wireless ultraviolet lights. The method analyzed communication models of wireless ultraviolet Line of Sight(LOS) and Non-Line-of-Sight(NLOS), thus deriving the distance algorithm for LOS and NLOS communications. The location coordinates of unknown nodes were solved by the four node localization algorithm. Using a 255 nm UV LED as the light source, a PMT as the Keywords：light communication;ultraviolet light;positioning method;ranging error;flight guidance- 67
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Published：2020-08-13
Modern Applied Optics
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Development of Φ1032 mm optical window for shipboard photoelectric tracking system
Abstract：Aiming at the protection of reflective main optical system for shipboard photoelectric tracking systems, an 1 m size optical window and its frame were designed, manufactured and tested. Firstly, the performance and strength of the window material were analyzed. According to the influence of the difference between internal and external pressures, the weight and the rotational inertia force on the window, the minimum thickness was determined. Then, the effects of deformation of optical window and frame on optical path difference and the environmental adaptability were studied base on the index requirements. Moreover, the aplanatic non-planar grinding method was used for machining and inspecting the optical window. Finally, an fused silica optical window with 1 032 mm in diameter, 80 mm in thickness and 1 010 mm in aperture diameter were successfully developed. The optical path difference is RMS=0.062 8λ@632.8 nm. The results proves that the optical window can provide an effective protection for main optical system of photoelectric tracking systems.Keywords：photoelectric tracking system;optical window;Optical Path Difference(OPD);reflective optical system- 56
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Published：2020-08-13 -
Suppression mechanics of returning wave speckle with multibeams illumination
Abstract：In order to suppress the speckle effect of target surface induced by laser illumination, and to increase the image quality of laser active imaging, the multibeams illumination technology was adopted and its effect on rejection of returning wave speckle was investigated theoretically and experimentally. The splitting illumination model of multibeams was established. The speckle suppression principle of multibeams illumination in entire speckle superposed field and partly speckle superposed field was analyzed Keywords：laser active detection;multibeams illumination;speckle effect;roughness- 73
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Published：2020-08-13 -
Suppression method for angle measurement error of mixing-layout multiple reading head
Abstract：Under the premise of not increasing size of code, layout form for reading head of angle measurement sensor was researched to develop high-precision angle measurement sensor with miniaturization. Through harmonic analysis for angle measurement error, the suppression principle of layout for multiple reading head to angle measurement error was deducted and analyzed in detail. On the basis of intensive study on various typical layout modes for multiple reading head, a mixed layout method for reading head combin Keywords：angle measurement error;angle measurement sensor;multiple reading head;harmonic analysis;layout form- 87
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Published：2020-08-13 -
Modeling and analysis of magnetic field distribution for stack giant magnetostrictive actuator
Abstract：In this paper, a kind of Stack Giant Magnetostrictive Actuator (SGMA) was designed, then the magnetic field distribution model of SGMA was established, and analytical research on model was conducted to increase uniformity of bias magnetic field of GMA. Firstly, given the characteristics and drawbacks of infliction way of bias magnetic field in traditional GMA, structural form of alternative arrangement for permanent magnet and GMM rod was adopted to design SGMA. Then by combining magnetic circuit model with Keywords：stack giant magnetostrictive actuator;uniformity of magnetic field;magnetic field distribution model;model analysis;structural design- 60
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Published：2020-08-13 -
Study on permeability characteristics of porous materials for aerostatic support
Abstract：To improve the theoretical calculation precision of permeability coefficient for porous material, solving model of permeability coefficient was established on the basis of fractal theory, and solving method of fractal dimension was optimized by image processing. Firstly, after photographing surface image of four kinds of porous materials with a scanning electron microscope, fractal dimension was solved by box dimension method and influence of image size and amplification factor of porous material on solving Keywords：aerostatic support;porous material;fractal;permeability coefficient- 84
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Published：2020-08-13 -
Influence law of installation errors on helix deviation of spur gear artifact
Abstract：In the measurement practice of gear helix deviation, there is phenomenon that big difference often appears between helix deviations for different gear teeth. In order to improve the measurement accuracy of gear helix deviation, influence laws of installation error of mandrel and gear on gear helix deviation were respectively researched. Firstly, mathematical models of influences of mandrel installation eccentricity and tilt error as well as gear installation eccentricity and deflection error on gear helix d Keywords：gear artifact;helix deviation;installation error;precision measurement- 107
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Published：2020-08-13 -
Mixing characteristics of passive-type micro-mixer with 3D-asymmetrical rhombus
Abstract：Increasing applicable scope of Reynolds number and mixing strength is development trend of micro-mixer design. A passive-type micro-mixer of 3D-asymmetrical rhombus was designed and manufactured on the basis of asymmetrical separation and reconstruction mixing principle, and change of mixing strength and mixing state were studied by means of numerical analysis and visualized experiment. Results indicate that in scope of low Re (0.01~10), the mixing between two components is dominated by diffusion mixing, wi Keywords：micro-mixer;micro-passage;3D-rhombus;asymmetrical separation and mixing;numerical simulation- 75
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Published：2020-08-13 -
Influence of static friction for large aperture SiC light-weight reflecting mirror with flexible strip support
Abstract：For the large aperture reflecting mirror with flexible strip support, static friction between large aperture optical reflecting mirror and support stripe has great influence on surface distortion of reflecting mirror. Moreover, the influence is hard to measure in quantity directly. In consideration of the fact that ambient temperature fluctuation would lead to state change of static friction, relational expression of temperature-static friction was established. On the basis of the relational expression, the Keywords：flexible stripe support;static friction;mirror distortion;temperature change;finite element analysis;large-aperture SiC light-weight reflecting mirror- 105
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Published：2020-08-13 -
Improvement of testing device for Fe-Ga magnetic properties and dynamic magnetostrictive experiment
Abstract：Due to the influence of vibration caused by magnetic field of excitation coil, the strain measured by test device of Fe-Ga magnetic characteristics is usually larger than actual one. This paper explained and verified the above phenomenon. By analysis the measurement process of dynamic magnetostrictive strain of Fe-Ga alloy, the original testing device was improved by fixing one end of the sample on pole head and adjusting excitation magnetic field near saturated magnetic field of the sample, resulting in er Keywords：dynamic magnetostriction;test of magnetic characteristics;Fe-Ga;electromagnetic force- 117
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Published：2020-08-13
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Thermal conductivity enhancement design for carbon-fiber truss of space camera
Abstract：As the carbon-fiber reinforced polymer (CFRP) composite material common used for truss structure of space camera has the drawback of low thermal conductivity, great temperature gradient is easily formed in the truss. The method that copper grid was adhered and aluminum film was pasted on the surface of CFRP was proposed to enhance thermal conductivity for carbon-fiber truss of a space camera. Firstly, thermal conductivity model of CFRP was established. Then heat transfer models for four kinds of plates(incl Keywords：space optics camera;truss structure;carbon-fiber composite material;thermal conductivity enhancement;equivalent thermal conductivity- 87
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Published：2020-08-13 -
Design and experiment of high-torque MR clutch in compression-shear mode
Abstract：A kind of magnetorheological (MR) clutch in compression-shear mode was designed and an experiment device was fabricated to test its transmission performance. Firstly, working principle of MR clutch was introduced. Secondly, distribution characteristic of magnetic flux intensity of magnetic circuit was analyzed with ANSYS finite elements analysis software. Finally, experiment testing device was established to test static transmission performance and dynamic response characteristics of MR clutch. Experiment r Keywords：magnetorheological fluid;clutch;compression-shear mode;torque;response time- 101
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Published：2020-08-13 -
A rapid hot embossing of micro-arch array LGP and micro-optics application
Abstract：The precision hot embossing of microlens array needs heat preservation time, leading to poor efficiency. Hence, a rapid hot embossing of micro-arch array on polymer light guide plate (LGP) is proposed using a heated microgrooved die core. It only performs a thermal deformation for micro-scale surface layer flowing inside microgroove spaces without changing macro workpiece sizes. The objective is to develop the hot embossing process of microlens array of micro-optics with high machining efficiency and low en Keywords：micro hot embossing;microlens array;micro-grinding;micro-optics;LGP- 101
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Published：2020-08-13
Micro/Nano Technology and Fine Mechanics
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Adaptive robust control over high-performance VCM-FSM
Abstract：In order to improve the performance of the aviation photoelectrical stabilized platform, an adaptive robust control (ARC)-based VCM-FSM (voice coil mode-fast steering mirror) was proposed. Firstly, the current loop was adopted into electric circuit to simplify the complex model of motor into a first-order model and guarantee the stablity of output torque of the motor. Secondly, on the basis of conventional PD controller, ARC algorithm was introduced to control the position of VCM-FSM and restrain disturbanc Keywords：aerial photoelectrical stabilized platform;VCM-FSM;PZT-FSM;stability precision of LOS;parameter robustness- 98
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Published：2020-08-13 -
Sparse reconstruction method based on integrating data fidelity term and sparse constraint term
Abstract：Aiming at the process of low-dose photon counting imaging with Poisson-Gaussian mixed noise, a sparse reconstruction method of integrating data fidelity term and sparse constrait term is proposed. Firstly, based on the hypothesis that Poisson and Gaussian noise are mutually independent, the sparse reconstructing objective function based on integrating data fidelity term and sparsity constraint term is established. Based on patch clustering, the improved greedy algorithm is applied to implement sparse decomp Keywords：sparse reconstruction;dictionary learning;mixed noise;strong noise;Low-dose photon counting imaging- 59
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Published：2020-08-13 -
Vibration isolator with relaxation type damping for micro-vibration isolation from satellite remote sensors
Abstract：A vibration isolator with relaxation type damping was proposed for micro-vibration isolation from satellite remote sensors to get better high frequency attenuation rate as well as the resonance control capacity. A vibration isolation model of the relaxation type viscous damping was established. The absolute transmissibility of the vibration isolator model with relaxation type damping was deduced and compared with that of a traditional Kevin vibration isolation model. The vibration isolator with relaxation t Keywords：relaxation type damping isolator;micro-vibration isolation;force transmissibility;dynamic stiffness;satellite remote sensor- 111
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Published：2020-08-13 -
Evaluation of information acquisition capability of optical remote sensing satellites
Abstract：A model for evaluation of the capability index of information acquisition in remote sensing was proposed. The main factors affecting the satellite remote sensing information acquisition ability, including orbit, imaging resolution, attitude maneuver ability were analyzed. By taking the comprehensive target identification as the standard, an evaluation model of ability index for the information acquisition which covers imaging resolution, target revisiting and attitude maneuver was established. The implement Keywords：optical remote sensing;remote sensing satellite;information acquisition;capability index;measurement model- 73
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Published：2020-08-13 -
Ship detection on sea surface based on multi-feature and multi-scale visual attention
Abstract：To detect ship targets accurately, a new method to detect ship targets on sea surface was proposed based on multi-feature and multi-scale visual saliency. Firstly a scale-adaptive top-hat algorithm was used to suppress the interference of clouds and oil. Then, the double-quaternion images are constructed by using double-color spatial features and edge features to detect the saliency of ships. This method makes full use of the double quaternion images, so it can be operated at the same time in a number of ch Keywords：target detection;ship detection;visual saliency on frequency domain;multi-scale morphology;double quaternion- 77
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Published：2020-08-13 -
Non-rigid registrations based on image characteristics and optical flows
Abstract：As the non-rigid image registration methods can not meet the requirements of registration accuracy and registration time simultaneously, three kinds of improved non-rigid registration methods are proposed based on image characteristics and image gray. These non-rigid registration methods were based on the Circle Descripto increases Feature (CDF), Dynamic Driving Force Demons (DDFD) and image characteristics and optical flow, respectively. In CDF method, feature points were extracted from the images, and the Keywords：image registration;non-rigid registration;feature extraction;optical-flow model;circle descriptor- 102
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Published：2020-08-13 -
Autonomous calibration of star sensors based on nonlinear optimization algorithm
Abstract：Calibration methods of traditional star sensors ignore the additional errors from the interaction between optical parameters and distortion coefficients. This paper proposes an autonomous calibration algorithm based on nonlinear optimization to overcome the problems mentioned above. Firstly, the algorithm ignores the distortion to construct a target function, and the Levenberg-Marquardt nonlinear optimization algorithm is used to optimize the optical parameters of the star sensor. Then, the optimized optica Keywords：star sensor;autonomous calibration;optical parameter;distortion coefficient;nonliner optimization- 249
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Published：2020-08-13 -
Blind restoration of camera shake blurred image based on L0 sparse priors
Abstract：An improved regularization blind restoration method based on L0 sparse prior was proposed to overcome the image blue from camera shake. A new optimization mode on the basis of inherent property which the gradient distribution of the blurred image is denser than that of the clear image and the sparse of the dark channel is relatively smaller. Aiming at the highly non-convex of L0 norm and nonlinear minimization problem in the dark channel sparse optimization process, an approximate linear map matrix based on Keywords：blurred image;blind image restoration;L0 regularization;gradient distribution;dark channel prior;ringing effect- 67
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Published：2020-08-13 -
Visual tracking via adaptive interactive fusion
Abstract：As collaborative trackers based on traditional fusion strategy has poor robustness in complex environments, a novel adaptive interactive fusion tracking strategy based on the online updated transition probability matrix in a multiple model particle filter framework was proposed. Firstly, an iterative updating equation was obtained based on minimum mean square error estimation method based on the Bayes theory. Then, the numerical solution of the iterative equation was obtained by numerical integration algori Keywords：visual tracking;minimum mean square error;numerical integration;adaptive interactive fusion;transition probability matrix- 86
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Published：2020-08-13 -
INS/USBL/DVL information fusion and fault-tolerant verification for underwater vehicles
Abstract：This paper focuses on the accumulated positioning errors and poorer fault tolerance of Inertial Navigation System(INS)in an underwater vehicle. The phase difference position of the underwater acoustic Ultra Short Base Line(USBL) was analyzed and the solution process and coordinate transformation of INS/USBL navigation was deduced based on real time positioning and attitude error angle information obtained by the INS. Finally, in combination of a INS/Doppler Velocity Log (INS/DVL)filter, the applications of Keywords：integrated navigation algorithm;inertial navigation system;Ultra Short Base Line(USBL)system;Doppler Velocity Log(DVL);federated filtering- 91
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Published：2020-08-13 -
Biomimetic coupled processing system based on location mechanism of Ormia ochracea
Abstract：Ormia ochracea with an extremely short baseline is able to locate its specific parasitoid host (cricket) precisely. On the fact mentioned above, this paper establishes a biomimetic coupled processing system based on the Ormia ochracea to improve the performance of miniature direction finding (DF) devices. According to the mechanical model of coupled auditory structure of the Ormia ochracea, the time domain response and frequency domain response of the auditory structure were deduced and their phase differen Keywords：biomimetic coupled processing;ormia ochracea;coupled auditory structure;sound source orientation;direction finding- 75
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Published：2020-08-13 -
Weld width prediction of weldment bottom surface in high-power disk laser welding
Abstract：A method was proposed to obtain characteristic information in a welding process by visual sensing and to predict the weld width of weldment bottom surface by using a neural network model. A workpiece made from mild steel SS400 was welded by a high power disk laser. In welding processing, the weld conditions were changed, including laser welding power, welding speed and welding route and two high speed cameras were used to capture images containing characteristic information on both top surface and side surf Keywords：laser welding;weld width prediction;image processing;pattern recognition;neural network- 87
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Published：2020-08-13 -
Self-calibration based on simplified brown non-linear camera model and modified BFGS algorithm
Abstract：To accurately reflect the geometric imaging relationship of cameras, a self-calibration method was proposed based on simplified Brown nonlinear camera model and improved BFGS (broyden-fletcher-Shanno) algorithm. In this method, the linear camera model and the distortion model were fitted into a nonlinear model, and the nonlinear model parameters were constrained by fundamental matrices of the linear model to obtain a set of nonlinear constraint equations.Then, based on new quasi-Newtonian equation, an impro Keywords：self-calibration;Brown model;BFGS algorithm;non-linear camera model;quasi-Newton method- 99
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Published：2020-08-13
Information Sciences
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