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Issue 8 ， 2016
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∝-type tunable all-optical delay line on flat broadened spectrum
Abstract：According to the requirements of all optical networks and high speed optical time division multiplex systems for the time delay adjustment, a novel tunable ∝-type delay line is proposed based on the optical fiber nonlinear effect. The delay line is consist of some all-fiber-type devices, such as special optical fibers, optical fiber gratings, and optical fiber amplifiers. On the self-phase modulation, group-velocity dispersion effect and the light splitting effect, the delay line obtains the flat broadened Keywords：all-optical delay line;tunable delay line;optical fiber nonlinear effect;flat broadened spectrum;dispersion;all-optical network;time division multiplexing- 90
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Published：2020-07-07 -
Analysis of stiffness measurement precision of optical trap with Boltzmann statistics method
Abstract：The stiffness measurement precision of an optical trap is a key in optical force measurement, so this paper proposes a method based on Boltzmann statistics to analyze the stiffness measurement precision of the optical trap. Firstly, a near infrared optical tweezer was introduced and it was built on an air cushion platform in a dark room to isolate light interference and vibration interference. Then, a quadrant photodiode was used to detect the backscatter light of a microsphere captured by the tweezer and t Keywords：optical tweezer;near-infrared optical tweezer system;optical trap stiffness measurement;Boltzmann statistics method- 99
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Published：2020-07-07 -
Simultaneous measurement of atmospheric coherence length
Abstract：When the differential image motion monitor method is used to measure the atmospheric coherence length, it needs a number of frames recorded with objective motions. Therefore, this paper proposes a simultaneous measuring method of the atmospheric coherence length based on the wavefront structure function for spatial objective. The method uses a Shack-Hartmann wavefront sensor to measure the Zernike coefficients of a frame of aberrated wavefront with short exposure. Then, it subtracts the initial aberration o Keywords：adaptive optics;atmospheric coherence length;spatial objective;simultaneous measurement;wavefront structure function method- 150
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Published：2020-07-07 -
A anti-disturbance cerebral oxygen analyzer based on near-infrared spectra
Abstract：A sort of anti-disturbance cerebral oxygen analyzer based on near-infrared spectroscopy was researched to improve conventional test methods in complex measuring process and tedious anti-jamming treatment. Some effect factors on cerebral oxygen measuring accuracy were analyzed and a proper three-wavelength near-infrared detection light source (735nm/805nm/850nm)was selected to use in the system. On the basis of the absorptivities of HbO2 and HbR in the near- infrared spectra, the variation of the two substan Keywords：cerebral oxygen analyzer;Near-infrared Spectra (NIRS);anti-disturbance;interference model;breathlessness experiment- 76
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Published：2020-07-07 -
Ultra high speed driver timing method for million frame per second based on normal CCD image sensor
Abstract：An ultra high speed CCD driver timing method based on a normal CCD image sensor was proposed to improve the CCD image acquisition speed and achieve the image speed in million frame per second. The working processing of the CCD after masking was introduced. With a specialized mask, the original light sensitive area of the normal CCD sensor was divided into pixel array with a certain storage area to implement the storage function on a chip. The driver timing method to achieve the image speed in million frame Keywords：million frame per second imaging;CCD driver timing;high frame rate imaging system;Charge Couple Device(CCD)- 79
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Published：2020-07-07 -
High-precision positioning of projected point of spherical target center
Abstract：To improve the positioning precision of the projected point for a spherical target center, the imaging theory of spherical target and positioning method of the spherical target center were investigated. By establishing the imaging model of spherical target and combining spatial analytic geometry theory, the perspective projection properties of spherical target were verified and an exact expression for the position of projection point of sphere center was deduced. Finally, by combining with an actual measure Keywords：spherical target;visual measurement;positioning of spherical center projection;perspective transformation;camera calibration- 92
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Published：2020-07-07 -
Improvement of radiation measurement precision for target by using atmosphere-corrected coefficients
Abstract：A method to improve the infrared radiation measurement precision of a target based on correcting atmospheric transmittance by using an atmosphere-corrected coefficient was proposed. A measuring model of infrared radiation characteristics for the target was established, and the measuring method of the infrared radiation characteristics for the target was given. The method defines the ratio between the really-measured atmospheric transmittance at a short distance and the calculated one by using MODTRAN as an Keywords：atmosphere-corrected coefficient;atmospheric transmittance;infrared camera;infrared radiation measurement;measurement precision- 120
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Published：2020-07-07 -
Detection device of optical surface pollution for satellite and ground
Abstract：For the surface pollution of an optical communication terminal, a 10 MHz Aluminized Quartz Crystal Microbalance (QCM) is developed to detect the amount of deposited pollution in real time during a vacuum test. By introducing a reference crystal, the QCM eliminates the influence of environmental factors substantially, and reduces the requirements for temperature accuracy and its theoretical mass sensitivity is up to 10-9g/cm2. Through an absolute calibration experiment, the practical mass sensitivity of the Keywords：optical communication;Quartz Crystal Microbalance (QCM);optical surface contamination;outgassing rate- 94
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Published：2020-07-07 -
Design of double freeform surface lens based on LED radiation characteristics
Abstract：For the special requirements of the liquid crystal image source of a Helmet-Mounted Display(HMD), this paper chooses a smaller size and higher effective Light Emitting Diode(LED) as the backlight source. On the light intensity distribution curve of the LED, a double-freeform-surface lens array was designed based on the no-imaging optical theory to improve the backlight efficiency of the source. Three lens arrays with different radii were firstly designed to form a round light spot with uniform lightness. Th Keywords：Helmet-mounted Display(HMD);Light Emitting Diode(LED);LED backlight;non-imaging optics;freeform surface lens- 127
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Published：2020-07-07 -
Multi-point mobile measurement of atmospheric transmittance
Abstract：In consideration of the instability of light sources and the effects of optical collimation and atmospheric dynamic change of an atmospheric transmissometer on its measuring accuracy, this paper designs a new multi-point mobile atmospheric transmittance measurement system on a high precision guide rail. This system is based on a mobile measuring platform, and uses the multi point movement model to measure the atmospheric transmittance and extinction coefficient. The measuring accuracies from the proposed mu Keywords：atmospheric transmissometer;atmospheric detection;atmospheric transmittance;extinction coefficient;multi-point movement measurement- 82
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Published：2020-07-07 -
Measurement of optical parameters for array spectroradiometers
Abstract：Several kinds of optical problems involved in calibration of an array spectroradiometer were investigated, such as ultroviolet radiation, stray light, and bandwidth. The difference of ultraviolet radiation measurement of the array spectroradiometer under a xenon lamp and a tungsten halogen lamp was compared and the stray light from the measurement was evaluated. The spectra of the tungsten halogen lamp without and with optical filters were measured by using the array spectroradiometer and the deviation caus Keywords：array spectroradiometer;ultraviolet radiation;stray light;bandwidth;calibration- 84
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- 13
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Published：2020-07-07
Modern Applied Optics
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Transmission characteristics of precise planetary roller screw
Abstract：A new precision transmission mechanism based on a planetary roller screw was designed. According to the requirements of an electro-mechanical serve system, the transmission characteristics of planetary roller screw were analyzed. The structure constitution, principle and characters of transmission mechanism were demonstrated in detail and the transmission accuracy and transmission efficiency of the precise planetary roller screw were analyzed. Then, the influence factors of different errors on the transmiss Keywords：planetary roller screw;precise transmission mechanism;transmission precision;transmission efficiency- 71
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Published：2020-07-07 -
Integrated optomechanical analysis and experiments for influence of gravity on wavefront aberration of space camera
Abstract：The variation of the wavefront aberrations of a Three-mirror Anastigmat(TMA) space camera under gravity was analyzed by integrated analysis method and the analytical accuracy was discussed. The basic process and key technology of the integrated analysis method were introduced, two kinds of surface distortion conversion interface algorithm (ZERNIKE polynomial fitting method and shape function interpolation method) were compared. Then, the principles of two kinds of shape functions were introduced, and the in Keywords：space camera;wavefront aberrations;integrated optomechnical analysis;gravity deformation- 81
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Published：2020-07-07 -
Implementation and measurement of a miniaturized silicon resonant accelerometer
Abstract：A miniaturized Silicon Resonant Accelerometer(SRA) consisting of a MEMS (Micro-electro-mechanical System) and an ASIC(Application Specific Integrated Circuit) readout circuit is designed. The MEMS sensor is fabricated by an 80 μm thick SOI process and the noise in the ASIC is reduced by a series of vacuum packaging technologies. Firstly, a vibration signal is used as the control signal of a chopper in automatic gain control circuit to reduce the flicker noise and extra power consumption. Then, a multiplier Keywords：Silicon Resonant Accelerometer(SRA);Application Specified Integrated Circuit (ASIC);SOI process;vacuum packaging;miniaturization;low power- 99
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- 6
Published：2020-07-07 -
Indexing error transfer law of a gear grinding machine
Abstract：To predict the pitch machining accuracy of a gear to be ground, the transfer law of the systematic indexing error of the gear-grinding machine (Y7125) with flat-faced grinding wheel was researched. The normal 36 prism for angle measurement datum was calibrated in high-precision by using the full closure measurement method, then the systematic indexing error curve with 36 equal points was extracted on-machine based on the normal 36 prism and the relative measurement method. Finally, the precision gear-grindi Keywords：gear-grinding machine;indexing error;cumulative pitch deviation;error transfer law;full closure measurement method- 67
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Published：2020-07-07 -
Correction of 3-axis magnetic compass in multi-rotor UAV under variable control amounts
Abstract：To use effectively the magnetic compass in a multi-rotor Unmanned Aerial Vehicle(UAV) in special environments, this paper researches the magnetic deviation correction method when it works at a large current and a variable control amount. Firstly, the variation patterns of magnetic deviation were derived and an error model was established. The relationship between hard magnetic error and the control amount was also analyzed. Then, a spatial linear fitting method was proposed based on Total Least Square (TLS) Keywords：multi-rotor Unmanned Aerial Vehicle(UAV);magnetic compass;variable control amount;hard magnetic error;error compensation- 83
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Published：2020-07-07 -
Thermal field distribution in fly-cutting of KDP crystal and its influence on chip morphology
Abstract：This paper researches the thermal field distribution of a Potassium Dihydrogen Phosphate (KDP) crystal in fly-cutting process, and explores the influence of cutting temperature on the fly-cutting process of KDP crystal. Firstly, the thermal-mechanical coupled Finite Element Method(FEM) was conducted to simulate the fly-cutting process of KDP crystal and to obtain the temperature fields under different cutting depths. Then, a fly-cutting machine and a nanoindentation instrument were used to cut the KDP cryst Keywords：Potassium Dihydrogen Phosphate (KDP) crystal;crystal fly-cutting;thermal field;chip;microscopic morphology- 65
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Published：2020-07-07 -
Thermal-structural coupled analysis and verification of 2-D mirror gimbal for lunar-based telescope
Abstract：To improve the work performance of a 2-D mirror gimbal for the lunar-based telescope, the thermal-structural coupled analysis was carried out, and the analysis results were verified by thermal and onboard tests. According to the given input conditions, thermal loads and the thermal boundary, the finite element model was established to calculate the temperature fields of the mirror gimbal and main heating components. Through inputting the temperature loads, preloads and the boundary conditions into the finit Keywords：lunar-based telescope;mirror gimbal;thermal-structural coupled analysis;thermal deformation;thermal stress;friction moment- 89
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Published：2020-07-07 -
Flexible semi-kinematic support for middling primary mirror
Abstract：A flexible semi-kinematic support was proposed for a middle-sized mirror to simplify the support structure of the primary mirror , reduce its assembled difficulty and improve its adaptability to temperature variation. By compared with rigid semi-kinematic support for a small-sized mirror, the features and merits of the flexible semi-kinematic support were expatiated. Based on these features and merits, a support structure for the primary mirror with an aperture of 710 mm was designed, analyzed and tested, i Keywords：middling primary mirror;semi-kinematic;flexible support;optimum design;Finite Element Method(FEM)- 126
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Published：2020-07-07 -
Linear piezoelectric motor with triangular displacement transformer
Abstract：A linear piezoelectric motor was proposed by using the stacked piezoelectric ceramics as a excited vibration source to enlarge its stroke and to maintain a higher precision. The working principle of the linear motor was analyzed, and the moving trajectory equation of the driving tip in the linear motor was deduced at a working state. The construction of the linear motor was designed, and a prototype of the motor was fabricated, assembled and tested. Finally, the motion performance of the motor was measured Keywords：linear motor;piezoelectric motor;stacked piezoelectric ceramics;triangular displacement transformer;dual modes- 73
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Published：2020-07-07 -
Actuation efficiency of dielectric electroactive polymer cylindrical actuators
Abstract：This paper focuses on the electromechanical conversion mechanism, energy losses and drive efficiencies of cylindrical actuators based on Dielectric Electroactive Polymer (DEAP). A electromechanical energy conversion model was established, the parameters for the equivalent circuit model of an actuator were measured and calculated through experiments, and the influence of the some factors such as electrode materials on the relative dielectric constant of the DEAP were analyzed. The current leakage loss of the Keywords：dielectric electroactive polymer;electromechanical conversion;cylindrical actuator;actuation efficiency;current leakage- 83
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Published：2020-07-07 -
Model and control of high-frequency response servo tool
Abstract：As the fast servo tool based on piezoelectric actuators only provides one-way driving force, a new fast servo tool based on dual piezoelectric actuators was designed. The two piezoelectric actuators in the fast servo tool were used to provide driving forces for feeding and recovery of tools and they were symmetrically arranged for effectively enhancing the overall stiffness of the servo tool. To control the two piezoelectric actuators, a PI model of dual piezoelectric actuators and its inverse model were es Keywords：fast servo tool;dual piezoelectric actuator;PI model;high-frequency response- 82
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Published：2020-07-07
Micro/Nano Technology and Fine Mechanics
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High-precision calculation for attitude angles of fast steering mirror
Abstract：To improve the pointing precision of output laser for a tracking turntable, the relationship between the attitude angles of a Fast Steering Mirror (FSM) and the tracking error of a tracking turntable was researched and a high precision calculation method for attitude control angles of the FSM was proposed. The light path of the output laser of the tracking turntable and the operating principle of the FSM were introduced. Then, the directions of the incident light and emergent light were determined in differ Keywords：fast steering mirror;tracking turntable;pointing accuracy;attitude angle;analytic expression- 117
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Published：2020-07-07 -
Action recognition based on on-line random forest voting
Abstract：An action recognition method for people is proposed based on on-line random forest voting to judge the action classification. The on-line random forest voting model is established and its algorithms are researched through the two parts consisting of on-line training and on-line detection to improve the precision of the action classfication. As people action shows important information in both space and time, the method firstly trains the random forests in line by extracting 3D image features containing a la Keywords：action recognition;random forest voting;large displacement optical flow;action map;intelligent video- 82
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Published：2020-07-07 -
De-hazing of atmosphere veil haze images
Abstract：A fast atmosphere veil de-hazing method was proposed to overcome the shortcomings of existing de-hazing methods in lower process efficiency, poorer treatment result of sky part and a bad visual effect for images. The method focuses on the improvements for global atmospheric light values and the acquiring method of atmospheric veil values. Firstly, the Gaussian low-pass filter method was used to gain a low frequency area of an image, and the circle quarter figure algorithm was used to obtain the global atmos Keywords：atmosphere veil haze image;image de-hazing;low-pass filter;circle quarter figure algorithm;tone mapping;halo effect- 76
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Published：2020-07-07 -
Space-borne CCD imaging circuit system with high signal-to-noise ratio
Abstract：To capture the space-borne remote sensing image with a high Signal-to-noise Ratio(SNR), this paper analyses the main factors effect on the SNR of images according to the chain of the CCD imaging system. The expression of SNR in the system was indicated in terms of the response model of CCD imaging system. By avoiding the independency of specific CCD model, a design method of “overall-division-overall” was proposed to implement the CCD imaging circuit with higher SNRs. A completion development method includi Keywords：Changed Coupled Device(CCD);space-borne CCD camera;CCD imaging circuit;signal-to-noise ratio;Jilin-1 satellite- 147
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Published：2020-07-07 -
Long-term object tracking based on kernelized correlation filters
Abstract：As Kernelized Correlation Filters (KCF) tracking algorithm has poor performance in handling scale-variant, heavy occlusion, similar target interfere and out of view, this paper proposes a long-term tracking approach based on the KCF. Firstly, a spatial regularization component was introduced in the learning of a classifier , the classifier coefficients were penalized depending on the weight function of spatial location information in sample locations. By which the classifier could learn significantly larger Keywords：kernelized correlation filter;long-term object tracking;spatial regularization;Support Vector Machine (SVM);online SVM classifier- 108
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Published：2020-07-07 -
Stereo matching for Fish-eye images based on epipolar geometry and support neighborhood
Abstract：A stereo matching algorithm based on epipolar geometry and support neighborhood was proposed to solve the problems of epipolar curve and matching cost calculation caused by image distortion in fisheye stereo system. Firstly, a fisheye camera was calibrated to obtain its relevant parameters. For the lens distortion of a fisheye lens, the epipolar curves of the system were derived according to the projection model of fisheye lens , and these epipolar curves were used to define searching scope when searching f Keywords：computer vision;stereo matching;fisheye image;epipolar curve geometry;support neighborhood- 100
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Published：2020-07-07 -
Correlation filter tracking based on feature fusing and model adaptive updating
Abstract：A Correlation Filter based Tracking(CFT) method based on adaptive feature fusing and model adaptive updating is proposed. The proposed method computes the adaptive feature weights by using the loss function of a filter model in training stage, and performs the weighted summing for response maps with multiple features in detection stage. Then it realizes the adaptive feature fusing of response maps. Furthermore, an adaptive model updating strategy is designed to estimate the occlusions and wrong tracking res Keywords：vision tracking;correlation filter tracking;feature fusion;model adaptive updating- 67
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Published：2020-07-07 -
Optical remote sensing object detection based on fused feature contrast of subwindows
Abstract：A detection algorithm for optical remote sensing targets was proposed based on the fused features contrast of subwindows. Firstly, a large number of varisized sliding windows were generated in a training image, and four types of scores related to multi-scale saliency, affine invariant region contrast, edge density and superpixel straddling were computed within each window. The feature parameters were learned on validation sets by maximizing localization accuracy and posterior probability. Then, all the feat Keywords：optical remote sensing;object detection;fused feature contrast;subwindow;saliency;affine invariant;edge density- 70
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Published：2020-07-07 -
Invariance of image ellipse oblateness degree and its application to construction of affine invariants
Abstract：As the traditional affine invariants based on the invariant of area ratio are characterized by unstable and redundant feature points, error accumulation, this paper proposes a novel method based on the division strategy of image ellipse oblateness degree for construction of affine invariants. The affine transformation model was presented, and the condition of affine approximation was obtained. In combination of the definition of image ellipse oblateness degree and the invariant moment theory, the invariance Keywords：image ellipse oblateness degree;affine invariant;image feature;image recognition- 75
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Published：2020-07-07 -
Nonuniformity of CMOS image with double channels and column readout and its correction
Abstract：The CMOS image nonuniformity and its correction methods were researched to improve the relative radiation quality of aerial remote sensing image products. Taking the new CMOS image sensor CIS2521F as an example, the nonuniformity characteristics affected by dark current noise, average gay and double channel readout were researched through the experiments of the integrating sphere observation. Then, the two-point linear correction method based on the observation data was used to remove the column strip noise Keywords：remote sensing image;Complementary Metal-oxide-semiconductor Tansistor(CMOS);image nonuniformity;double channels;radiation correction- 83
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Published：2020-07-07
Information Sciences
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