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Issue 3 ， 2018
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Fabrication and properties of plasmonic hot-electron phototransistor
Abstract：Windows of traditional wide band gap photodetectors are limited by the band gap of the semiconducting material used. In order to address this issue, the photoelectric properties of a plasmonic hot-electron phototransistor were fabricated and investigated. We have developed a plasmonic hot-electron phototransistor using a heavily doped silicon wafer as the back gate and insulating layer. Gold nanoparticles (AuNPs) were fabricated on the surface of the insulator via thermal annealing and the plasmonic hot-ele Keywords：photoelectronic dectection;plasmonic;hot-electron;band gap;Indium Gallium Zinc Oxide (IGZO)- 157
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- 18
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Published：2020-07-05 -
Temperature and coupling field analysis of path length control mirrors
Abstract：Path length control mirrors (PLCM) are important devices used to keep the cavity length of ring resonators stable. The deformation caused by the temperature variation directly affects the optical path shape and beam quality of ring resonators. In this paper, a finite element simulation model of PLCMs was established using ANSYS. Subsequently, the model was used to analyze the temperature and coupled fields of a PLCM under different temperature conditions. The deformation distribution in the middle of the mi Keywords：laser gyroscope;path length control mirror;finite element analysis;temperature field;coupled field- 100
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Published：2020-07-05 -
Laser direct writing for binary patterns during accelerating and decelerating motion of scanning stage
Abstract：In order to further improve the efficiency of laser direct writing (LDW) in Cartesian coordinates, the exposure process was proposed to proceed in the accelerating and decelerating sections of the scanning stage, while the exposure effect was guaranteed by the following two ways. The pixel exposure data stored in a line buffer were clocked out by the position feedback pulses during the line scan, driving the acousto-optic modulator to obtain the corresponding beam intensity at the exact desired position. Ac Keywords：laser direct writing;binary pattern;square top-hat laser beam;exposure intensity modulation;direct writing efficiency- 123
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- 16
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Published：2020-07-05 -
Portable rapid microRNA detection system
Abstract：MicroRNA (miRNA) is closely related to the occurrence and development of certain diseases and can be used as a diagnostic marker. Conventional methods for the detection of miRNA are time-consuming and complex. Herein, a portable rapid miRNA detection system was designed. This system records the fluorescence intensity of the marker that is amplified via rolling circle amplification using a photoelectric detection technique, and analyzes the fluorescence data to obtain the changes in miRNA. Through our experiments, we observed that for reagent concentrations in the range 0.1-1 μmol, the linearity of the fluorescence intensity detected by the miRNA fluorescence detection equipment was less than ±5%, and the repeatability was ≥ 95%. Our roll amplification experiment involving the coronary heart disease diagnostic marker, miR-499, confirmed that the portable rapid miRNA detection system can detect miRNA quickly and effectively.Keywords：photoelectric detection;fluorescence detection;light detection;miRNA;rolling circle amplification- 113
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Published：2020-07-05 -
Performance of predictive correction for adaptive optics systems with frozen flow turbulence
Abstract：Accurate prediction of the atmospheric turbulence evolution in the next few sampling cycles can compensate for the time delay in the control systems of adaptive optics (AO) systems. In this paper, a predictive correction method in AO systems is proposed, and its robustness is analyzed. Under the frozen-flow assumption, the translational motion can be identified using the slope measurements of a Shack-Hartmann wavefront sensor (SHWS) in AO systems. Using the transverse wind information, prediction of the fut Keywords：adaptive optics;predictive correction;frozen flow hypothesis;Shack-Hartmann wavefront sensor- 66
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- 19
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- 5
Published：2020-07-05 -
High-precision bow-shaped fiber Bragg grating micro-displacement sensors
Abstract：In order to realize small deformation measurements of Numerical Control (NC) machine tool structures and micro-processing platforms, a high-precision optical fiber Bragg grating (FBG) micro-displacement-sensor based on a bow shape was designed. The grating region of the FBG was attached to the upper and lower walls of the bow. Hence, the strain value of the upper and lower walls could be measured while the bow was deformed, allowing displacement measurement and achieving temperature decoupling. Experimental Keywords：optical fiber sensing;Fiber Bragg Grating (FBG);micro-displacement sensors;high-precision;temperature compensation- 114
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Published：2020-07-05 -
Photon counting integral imaging based on adaptive Bayesian estimation
Abstract：A novel method of Bayesian adaptive estimation was proposed to improve reconstructed slice images based on a photon-counting integral imaging system for three-dimensional (3D) targets in a photon-starved environment. First, a series of photon-counted elemental images were obtained by a photon-counting integral imaging system. Subsequently, based on the Poisson distribution of the photon-counting process, the posterior probability model for photon estimation of the elemental images was established with one l Keywords：photon counting;depth slice;Bayesian estimation;adaptive mean;integral imaging- 210
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- 16
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- 3
Published：2020-07-05 -
Application of Raman scattering properties of transition metal dichalcogenides in immunoassays
Abstract：To realize biodetection based on Raman scattering of semiconductor under visible light excitation, the Raman probe was constructed by using MoS2 material, a narrow bandgap semiconductor, to realize high specific recognition of the human IgG molecule. First, MoS2 and WS2 micromaterials were obtained by liquid-phase exfoliation method. The effect of temperature on the intensity of the Raman signal excitated by a 532 nm laser was analyzed through heating and aging treatment. Second, the carboxyl group was intr Keywords：bioinstrumentation;transition metal dichalcogenides;Raman scattering;temperature;immunoglobulin- 84
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- 15
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- 3
Published：2020-07-05
Modern Applied Optics
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Online performance evaluation of RLG INS based on joint rotation and modulation
Abstract：Modern ships are usually redundantly equipped with one-axis indexing ring laser gyro (RLG) marine inertial navigation system (MINS) and several two-axis indexing RLG MINS. In order to online evaluate the relative performance of the redundant two-axis indexing RLG MINS, an online evaluation method based on joint rotation and modulation was proposed without using external benchmark information. Several joint error Kalman filters were constructed. The system states of each Kalman filter included the position e Keywords：ring laser gyro;one-axis indexing INS;two-axis indexing INS;online evaluation;random error- 108
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Published：2020-07-05 -
Trajectory-fitting and testing error analysis of stage for curved grating etching
Abstract：To manufacture curved surface gratings with highly consistent blazing angles, the curve-fitting motion of the three-dimensional (3D) stage is essential. Therefore, an investigation of the 3D stage was performed based on a control algorithm for the curved blazed grating etching system. First, a concept of the 3D stage of the curved blazed grating etching system was introduced. Subsequently, according to the actual requirement of the etching machine, the theoretical calculating method for the track of the sta Keywords：diffraction grating;curved blazed grating;grating etching;3D stage;arc fitting algorithm;track testing error- 118
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- 18
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Published：2020-07-05 -
Reliability design and structural optimization of locking device for magnetic suspension control moment gyro
Abstract：To avoid the negative effects of structural parameters' randomness on its properties, an optimization method of locking elastic sheet based on reliability sensitivity was proposed. Firstly, the finite element model and failure modes of the locking elastic sheet for a magnetic suspension control moment gyro were analyzed. Afterwards, considering the randomness of the structural sizes and material parameters of the elastic sheet, the reliability of the elastic sheet in the series failure mode were studied by Keywords：control moment gyro;locking device;response surface;first order second moment;reliability sensitivity;weight reduction- 79
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- 15
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- 3
Published：2020-07-05 -
Electromagnet door release mechanism in deploying mechanism for CubeSats
Abstract：To implement reliable locking under launching mechanical environment and low-impact and fast-response unlocking on-orbit for the CubeSat "Star of Aoxiang", a non-pyrotechnic door release mechanism was proposed which locked by reset spring at the time of power off and unlocked by electromagnetic force at the time of power on. Firstly, according to the system requirements, the work principle of electromagnet door release mechanism was introduced, and the coupling dynamical models involving mechanical-electric Keywords：CubeSats;deployer;electromagnet door release mechanism;non-pyrotechnic;dynamics;flight proven- 98
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- 21
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- 2
Published：2020-07-05 -
Effect of material expansion coefficient and lubrication on telescope load torque under low temperature
Abstract：In order to improve the accuracy of the servo system at low temperature, the mechanism that the load torque of the telescope increase along with the temperature decrease must be deeply understood. Firstly, the influence factors of friction torque of bearing and the influence of low temperature on load torque were analyzed. The lubricant viscosity with temperature variation was studied. The relationship between load torque and grease was tested and discussed. The results indicate that the fluctuation of load Keywords：telescope;low temperature environment;friction torque;thermal expansion coefficient;grease- 97
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- 17
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Published：2020-07-05 -
Optimization on the structure of the absorption cavity of solar irradiance absolute radiometer
Abstract：In order to obtain the optimal structural parameters of the absorption cavity of Solar Irradiance Absolute Radiometer(SIAR), a study was carried out on the thermal circuit of the SIAR, which was constituted of the cavity, thermal link and heat sink. Based on the finite element method by using Ansys software, a reliable model of this thermal circuit was introduced. The temperature response curves of the model were consequently obtained. Then the effects of structural parameters of the cavity, e.g. sizes and Keywords：Solar Irradiance Absolute Radiometer (SIAR);thermal circuit;finite element method;optimal structural parameters of the cavity- 107
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- 16
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Published：2020-07-05 -
Removal characteristics and fluctuation behavior of cutting force during scratch process of RB-SiC ceramics
Abstract：This paper aims to explore the brittle fracture characteristics and fluctuation behavior of cutting force during scratch process of RB-SiC with different scratch depth and indenter shapes. The diamond Berkvoich indenter with 400 nm and conical indenter with 8.7 um were used to conduct experiments under constant scratch depth mode. Then, the surface morphologies and brittle fracture behavior were observed with a scan electron microscopy (SEM). Finally, Daubechies wavelet was adopted to decompose the lateral Keywords：RB-SiC;brittle fracture;wavelet analysis;scratch force;Berkvoich indenter;conical indenter- 101
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- 21
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- 3
Published：2020-07-05
MICRO/Nano Technology and Fine Mechanics
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Design of active constant output device based on cylinder
Abstract：According to the urgent needs of active flexibility of equipment in a wide variety of industry sectors, such as precise assembly, removing, shaving, grinding, polishing and scrubbing on the surface of workpiece, an active constant pressure output device based on a cylinder was designed. According to design goals, it made a specific choice of the devices (including proportional pressure regulator, cylinder, guide rail, pressure sensor, etc.) which were used. And a weak signal conditioning circuit was designe Keywords：press sensing;press control;proportional pressure regulator;RS485;data acquisition- 84
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Published：2020-07-05 -
Identification of florescent droplets at low concentrations for droplet digital PCR
Abstract：In the digital Polymerase Chain Reaction(dPCR) detection process, discriminating positive droplets from negative ones directly affect the final concentration, which is one of the important factors affecting the accuracy of the instrument. Current methods do not take into account the influence of sample concentration on the result error, resulting in a larger deviation from the actual results at a low concentration. In this paper, a florescent droplets classification method was designed based on generalized Keywords：digital PCR;generalized Pareto distribution;florescent droplets classification- 145
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- 17
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- 4
Published：2020-07-05 -
Dynamic analysis of two meters telescope mount control system
Abstract：In order to enhance the ability of disturbance rejection for the telescope, and improve the tracking accuracy of the telescope mount control system, this paper analysis the dynamic of mount control system for the two meters telescope. Firstly, the frequency response of telescope mount control system is test using swept sine. Secondly, the Observer/Klaman filter algorithm is employed to identify the model for the mount control system. Finally, the position controller and speed controller are designed based on the mount control model. The experimental results of target observation show that max tracking errors of the azimuth and elevation axis are less than 4.5", and the tracking error RMS are 0.378 6" and 0.151 6", when the target moving with the max speed 3.5 (°)/s and the max acceleration 1 (°)/s2. The experiments verify the good dynamic of telescope mount control system.Keywords：telescope;frequency response;model identification;servo system- 117
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- 21
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- 7
Published：2020-07-05 -
Design of high-speed atomic force microscope with a separated X-scanner
Abstract：To increase the imaging rate of atomic force microscope (AFM), a new AFM structure design was presented. In this structure, the Y and Z scanners were integrated in the scanning head, which move the probe in the slow-axis and the Z-axis, respectively. The X scanner was separated from the head, which moved the sample in the fast-axis. An independent one-dimensional nanopositioning stage was used as the X scanner. Due to its high stiffness, the X scanner could carry relative large samples and scan at a high sp Keywords：Atomic Force Microscope (AFM);high speed;fast-axis;scanner;optical lever- 123
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- 15
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Published：2020-07-05 -
A joint structure and self-balancing jig based on ultrasonic bonding
Abstract：Polymer microfluidic chips have high requirements for bonding precision, bonding strength and bonding efficiency.In order to avoid the clogging of microchannel by fusion and solve the problems of low bonding strength, uneven pressure distribution caused by leveling precision and high-frequency vibration in the process of ultrasonic bonding, the joint structure and self-balancing jig were designed and fabricated.First, based on the self-balancing jig and conventional jig with no leveling function, the pressu Keywords：microfludic chips;ultrasonic bonding;joint structure;self-balancing jig- 102
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- 14
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Published：2020-07-05
Micro/Nano Technology and Fine Mechanics
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A self-adaptive curve-segment method combining slope difference and dynamic merge
Abstract：In order to reconstruct the digital contour curve with arc and straight line, a method was proposed to integrate the segmentation of digital contour curve based on the slope difference judgement method and the dynamic segment merge method. First, the slope difference between the front and back directions of each point on the contour curve was calculated using straight line fitting. The process of obtaining the slope difference used the adaptive length fitting window to balance the relationship between the p Keywords：self-adaptive curve-segment;slope difference;self-adaptive smooth;dynamic merge- 87
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Published：2020-07-05 -
Research of the effect of echo outside field of view on fringes scanning imaging
Abstract：In order to eliminate the effect of echo outside the field of view (FOV) on fringes scanning imaging (also known as Fourier telescope or coherent field imaging), this paper analysed in theory the main factors of reconstruction overlap caused by echo, and provided the best solutions to different application scenes. This paper studied in detail the effect of echo from different illumination zones on imaging by means of computer simulation and also analysed in detail the improving effects of the scheme of addi Keywords：fringes scanning imaging;Fourier telescope;echo outside field of view (FOV);imaging field of view;reconstruction overlap- 94
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- 12
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Published：2020-07-05 -
Image entropy active contour models towards water area segmentation in remote sensing image
Abstract：In order to improve the accuracy of water area segmentation in high resolution remote sensing image, the image entropy was introduced into CV model because there was a quite difference of texture complexities between water area and background, and two active counter models based on image entropy were proposed in this paper. The image entropy of inside zero level set was adopted in CV model and forms a local image entropy active counter model (LIEACM). This model effectively reduced the incorrect segmentatio Keywords：remote sensing image;water area segmentation;active contour model;local image entropy;global image entropy- 140
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- 8
Published：2020-07-05 -
Light field computational reconstruction from focal planes based on light field camera
Abstract：Different from traditional cameras, light field camera sets a lenslet array between the main lens and the sensor at a specific position, which makes it possible to record the light intensity and the direction of light rays at the same time. In order to reconstruct the object-side light field, the reconstruction algorithm of the focal planes based on the light field camera was studied. Focal stack and projection slice theorem used in the algorithm was researched. Firstly, parameterized 4D light field definit Keywords：light field;computational optical;projection slice theorem;inverse reconstruction- 122
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Published：2020-07-05 -
Quaternion sparse decomposition algorithm for DOA estimation with acoustic vector sensor array
Abstract：This work extended sparse decomposition (SD) into quaternion space in order to find a better sparse representation for acoustic vector array (AVA). A novel sparse decomposition algorithm based on the well-known orthogonal matching pursuit (OMP) for quaternionic signals was proposed and it was used to solve the question of direction of arrival (DOA) estimation of AVA in small snapshot number, coherent signal source and low signal noise ratio (SNR) case. Compare with the complex field SD algorithm, The results illustrate that the atomic length of the over-complete dictionary is reduced to one-third of that from the long vector model, while errors in DOA estimation are effectively eliminated using the long vector method when the true angles of DOA estimation lie within 1°. Simulation results verify the validity of this algorithm.Keywords：acoustic vector array;sparse decomposition;quaternion;parameters estimation- 99
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- 3
Published：2020-07-05 -
Ship detection of complex sea background in optical remote sensing images
Abstract：In this paper, a fast and accurate ship target detection method wa proposed for ship detection in optical remote sensing image. The "coarse-to-fine" strategy was applied, which contains mainly three stages:the candidate regions extraction, building the candidate regions' descriptor and the candidate regions discrimination by reducing the false alarms to confirm the real ship targets. In the first stage, first the initial saliency map was extracted by the maximum symmetric surround method, which was based on Keywords：ship detection;remote sensing image;saliency detection;AdaBoost classifier- 121
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Published：2020-07-05 -
Research on industrial robot alignment technique with monocular vision
Abstract：Aiming at the problem of precise alignment of industrial arm, an industrial robot alignment method based on monocular vision is proposed. Combining the industrial robot with monocular vision measurement and a specialized hand-eye calibration panel, the method is able to quickly establish the hand-eye relationship between the camera coordinate system and the alignment axis on the robot's end-effector. In the alignment stage, the attitude of the workpiece is obtained by monocular vision system, and then according to the existing hand-eye relationship and datum posture, the position and orientation between the alignment axis and the workpiece of the alignment axis are evaluated. The experimental results show that the average precision of the alignment is better than 0.2° under the measuring distance of 150 mm.Keywords：position alignment;monocular vision;pose solution;hand-eye calibration;industrial robots- 235
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Published：2020-07-05
Information Sciences
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