2019
2019
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Record 49 of
Title:Temperature Compensation of MEMS Gyroscope Based on Support Vector Machine Optimized by GA
Author(s):Yang, Yuan(1); Liu, Ying(1); Liu, Yanghong(1); Zhao, Xiaodong(2)Source: 2019 IEEE Symposium Series on Computational Intelligence, SSCI 2019 Volume: Issue: DOI: 10.1109/SSCI44817.2019.9003139 Published: December 2019Abstract:The output of MEMS gyroscope is affected by temperature, which will produce temperature drift and affects the precision of gyroscope. To solve this problem, this paper proposes a method based on GA optimized support vector machine to compensate the temperature of gyroscope. Seven temperature points are selected in the whole temperature region as samples. Support vector machine (SVM) based on radial basis kernel function is adopted for modeling, and GA is used to optimize SVM parameters to further improve the accuracy of gyro temperature compensation. Experimental results show that the method proposed in this paper is more effective than traditional least square method and BP neural network. ? 2019 IEEE.Accession Number: 20201108276729 -
Record 50 of
Title:Control Strategy and Simulation of Tracking System under Acceleration Limit
Author(s):Wang, Hongyun(1); Han, Junfeng(1); Xu, Siwang(1)Source: 2019 3rd International Conference on Circuits, System and Simulation, ICCSS 2019 Volume: Issue: DOI: 10.1109/CIRSYSSIM.2019.8935567 Published: June 2019Abstract:Tracking system is an important part of the inter-satellite laser communication terminal. The motion in the tracking system affects the inertia stabilization of the entire communication terminal. Therefore, the acceleration of the laser communication terminal must be limited when tracking the target. In this paper, the tracking control strategy of laser communication terminal under acceleration limit was studied and analyzed. We also use Matlab for simulation analysis. ? 2019 IEEE.Accession Number: 20200308054735 -
Record 51 of
Title:Design and implementation of real-time intersection simulation for optoelectronic equipment
Author(s):CHEn, Yan(1); Zhang, Zhixiang(1); Zhou, Xin(1); Jin, Humin(2); Zhang, Mingmei(1)Source: Proceedings of 2019 IEEE 8th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2019 Volume: Issue: DOI: 10.1109/ITAIC.2019.8785504 Published: May 2019Abstract:As an important application of TTC equipment, it's difficult to design and realize the real-time intersection of angular data from photoelectric theodolites for acquiring target's position. It's necessary to build a simulation environment while developing intersection software for future practicability, and the simulation procedure should be based on the real treatment scheme of TTC data. A photoelectric theodolite real-time intersection simulation system is developed in this paper, with details about designing and building. This system can simulate ballistic trajectory data, photoelectric theodolite measuring data and run real-time intersection functions for calculating target positions, which depicts the whole procedure of photoelectric theodolite intersection in. Especially, a new treatment scheme of intersection data was provided, so the real-time intersection software could adaptively match angular data with intersection number for using the data at best. The system was proved to be efficient and approximated to the real condition, and the intersection software satisfied the need of real-time intersection. ? 2019 IEEE.Accession Number: 20193507359917 -
Record 52 of
Title:Study of light beam tracking based on compound axis control
Author(s):Jing, Feng(1,2); Zhang, Xin(1); Cheng, Zhiyuan(1); Cao, Yu(1); Lian, Xuezheng(1); Yang, Yongqing(1)Source: Proceedings of 2019 IEEE 3rd Information Technology, Networking, Electronic and Automation Control Conference, ITNEC 2019 Volume: Issue: DOI: 10.1109/ITNEC.2019.8728977 Published: March 2019Abstract:Compound axis control technology has the advantage of high-precision dynamic tracking, and is widely used in high-precision electro-optical tracking system, laser communication and other fields. For the applications of airborne and shipboard platforms, the compound axis control system will be seriously affected by the disturbance torque. In order to overcome the influence of the disturbance torque, this paper applies the disturbance observer to the compound axis control to improve the precision of the compound axis control system. The simulation and analysis of the improved compound axis control system prove the effectiveness of the method. ? 2019 IEEE.Accession Number: 20192607109995 -
Record 53 of
Title:Research on the fast image motion compensation technology of aerial digital camera
Author(s):Chen, Weining(1); Lei, Yangjie(1); Yang, Hong Tao(1)Source: ACM International Conference Proceeding Series Volume: Issue: DOI: 10.1145/3341016.3341641 Published: June 15, 2019Abstract:When the aerial camera is photographed, during the forward flight,there is a relative motion between the image formed by thephotographic object on the focal plane and the photosensitivemedium, which brings about image blur and seriously affects theimaging quality of the camera. This paper analyzes the cause ofheading image shift and its influence on image, and expounds thenecessity of image shift compensation. On the basis of theanalysis and study of various existing methods of image shiftcompensation, a heading image shift compensation mechanismwas designed, and the image shift compensation was carried outusing a moving target structure. The imaging effect was goodthrough flight tests. Can satisfy the multitype aerial imagingimage migration compensation requirements. ? 2019 Association for Computing Machinery.Accession Number: 20193707433996 -
Record 54 of
Title:Physarum inspires research beyond biomimetic algorithms: Reply to comments on "Does being multi-headed make you better at solving problems?"
Author(s):Gao, Chao(1); Liu, Chen(2); Schenz, Daniel(3); Li, Xuelong(4); Zhang, Zili(1); Jusup, M.(5); Wang, Zhen(6); Beekman, Madeleine(7); Nakagaki, Toshiyuki(3,8)Source: Physics of Life Reviews Volume: 29 Issue: DOI: 10.1016/j.plrev.2019.07.002 Published: July 2019Abstract:We look at a recent expansion of Physarum research from inspiring biomimetic algorithms to serving as a model organism in the evolutionary study of perception, memory, learning, and decision making. ? 2019 Elsevier B.V.Accession Number: 20192907184984 -
Record 55 of
Title:High-Power Single-Longitudinal-Mode DFB Semiconductor Laser Based on Sampled Moiré Grating
Author(s):Liu, Shengping(1); Wu, Hao(2); Shi, Yuechun(1,3); Qiu, Bocang(4); Xiao, Rulei(1); Chen, Min(1); Xue, Haiyun(5); Hao, Lijun(1); Zhao, Yong(1); Lu, Jun(1); Chen, Xiangfei(1)Source: IEEE Photonics Technology Letters Volume: 31 Issue: 10 DOI: 10.1109/LPT.2019.2906562 Published: May 15, 2019Abstract:In this mymargin letter, we experimentally demonstrated a 1550-nm high-power single-longitudinal-mode (SLM) distributed feedback (DFB) semiconductor laser based on sampled moiré grating (SMG). By designing the sampling structure with micrometer scale, moiré grating (MG) can be equivalently realized along the laser cavity. Then, we can reduce the coupling coefficient near laser facet so as to increase the output power. The cavity length and ridge width of the fabricated laser are 1.0 mm and 3.0 μm, respectively. The measured threshold current and the slope efficiency are 30.0 mA and 0.36 mW/mA at the heat-sink temperature of 25 °C, respectively. When the injection current is 800.0 mA, the maximum output power is about 183.0 mW. The saturation power is significantly improved compared with conventional DFB laser with uniform sampled grating (USG), which was fabricated on the same wafer. In addition, a four-channel DFB laser array based on SMG was also fabricated on the same wafer, showing good wavelength uniformity. ? 2019 IEEE.Accession Number: 20192006929738 -
Record 56 of
Title:Tumor tissue classification based on micro-hyperspectral technology and deep learning
Author(s):Hu, Bingliang(1,2); Du, Jian(1,2); Zhang, Zhoufeng(1,2); Wang, Quan(1,2)Source: Biomedical Optics Express Volume: 10 Issue: 12 DOI: 10.1364/BOE.10.006370 Published: December 1, 2019Abstract:In order to explore the application of hyperspectral technology in the pathological diagnosis of tumor tissue, we used microscopic hyperspectral imaging technology to establish a hyperspectral database of 30 patients with gastric cancer. Based on the difference in spectral-spatial features between gastric cancer tissue and normal tissue in the wavelength of 410-910 nm, we propose a deep-learning model-based analysis method for gastric cancer tissue. The microscopic hyperspectral feature and individual difference of gastric tissue, spatial-spectral joint feature and medical contact are studied. The experimental results show that the classification accuracy of proposed model for cancerous and normal gastric tissue is 97.57%, the sensitivity and specificity of gastric cancer tissue are 97.19% and 97.96% respectively. Compared with the shallow learning method, CNN can fully extract the deep spectral-spatial features of tumor tissue. The combination of deep learning model and micro-spectral analysis provides new ideas for the research of medical pathology. ? 2019 Optical Society of America under the terms of the OSA Open Access Publishing AgreementAccession Number: 20200508115350 -
Record 57 of
Title:Design of a high precision optical galvanometer driver
Author(s):Lian, Xuezheng(1); Ma, Zihan(2); Wei, Yu(1); Huang, Wei(1); Xie, Meilin(1,2); Feng, Xubin(1); Jing, Feng(1)Source: Proceedings of 2019 IEEE 8th Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2019 Volume: Issue: DOI: 10.1109/ITAIC.2019.8785886 Published: May 2019Abstract:In Infrared Search and Track System (IRTS), the single frame imaging field of view of the plane array infrared detector is very small, which can not meet the increasing demand for wide field of view applications. The optical galvanometer has a very high cost performance in the application of lowcost and small volume. At the same time, the application is very necessary in terms of improving performance. In this paper, In order to expand its functionality and applicability, a pure analog and high-precision optical galvanometer drive controller is designed, and the current loop, speed loop and position loop are specially processed, which has high reliabili clear image. ? 2019 IEEE.Accession Number: 20193507359525 -
Record 58 of
Title:Research on Large Caliber FSM Digital Control System Based on Voice Coil Motor
Author(s):Cao, Yu(1,2,3,4); Wang, Haitao(1); Lv, Tao(1,3); Wang, Rui(3); Jing, Feng(1,3); Han, Junfeng(1,3); Xie, Meilin(1,3)Source: Proceedings of 2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference, IAEAC 2019 Volume: Issue: DOI: 10.1109/IAEAC47372.2019.8998015 Published: December 2019Abstract:Fast-steering Mirror (FSM) with its precise positioning characteristics and fast response ability, occupies an increasingly important position in the field of space science and communications. FSM is one of the top technologies at present[1]. At present, analog galvanometer control system imported from abroad is mainly used in the domestic market, which has the disadvantages of weak anti-interference ability and difficult to expand[4]. Based on this, a high-speed, 90mm digital FSM control scheme is designed in this paper. The working principle of the system is analyzed, the software and hardware design of the system are described, and the position sampling principle and control method of FSM are introduced in detail. Using digital notch filter to suppress mechanical resonance, a digital FSM control system based on DSP is developed. The experimental results show that the control bandwidth of the system reaches 300 HZ, and the system runs stably and reliably, so it has great application prospects[2]. ? 2019 IEEE.Accession Number: 20201108285103 -
Record 59 of
Title:Instability transverse mode phase transition of fiber oscillator for extreme power lasers
Author(s):Gao, Wei(1,2,3); Zhao, Baoyin(1); Fan, Wenhui(1,4); Ju, Pei(1,3); Zhang, Yanpeng(2); Li, Gang(1,3); Gao, Qi(1,3); Li, Zhe(1,3)Source: Optics Express Volume: 27 Issue: 16 DOI: 10.1364/OE.27.022393 Published: 2019Abstract:High-power fiber lasers have been widely explored in engineering and science, and improving the beam quality restricted by transverse mode instability (TMI) is waiting to be solved for extra high-power applications. Here, we theoretically propose a phase transition model for understanding TMI in a fiber oscillator. A general dynamics model describing TMI is established by modifying the heat equation, and then a special dynamics model of a two-mode fiber (TMF) oscillator is obtained by applying this general dynamics model to TMF oscillator case. Theoretical analysis shows that there is a reversible phase transition point in this TMF oscillator model, which can well explain the sudden and reversible change of TMI. Based on linear stability analysis near the phase transition point, an analytical threshold formula of TMI is given to calculate the TMI threshold in the TMF oscillator. The calculated results are consistent with the reported experimental results. Furthermore, the relationship between the TMI threshold and several parameters was also discussed in detail such as laser wavelength, pump wavelength, core radius, cladding radius, etc. This theoretical model will be useful to understand and suppress the TMI in fiber oscillators. ? 2019 Optical Society of America under the terms of the OSA Open Access Publishing AgreementAccession Number: 20193207292674 -
Record 60 of
Title:High contrast optical system design for exoplanets imaging
Author(s):Hao, Bo-Zun(1,2); Fan, Xue-Wu(1); Yuan, Hao(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 11341 Issue: DOI: 10.1117/12.2545687 Published: 2019Abstract:In this paper, a stellar coronagraph system with wavefront correct instrument is proposed, the optical design and image quality evaluation of the system are carried out, including the optical design of the front telescope system, the collimator instrument, wavefront correcting system in coronagraph and the optical design of the imaging lens. The front system used a structure of off-axis double-mirror telescope, with a diameter of 2.4m, 16 for F, and a FoV of 10 '×10', The design requirements of the coronagraph instrument is: wavelength band is 450nm to 950nm, the detector is a EMCCD with the resolution of 1k×1k, pixel size of 13μm, the diameter of deformable mirror is 10mm. The design requirements of the imaging lens is: the optical aperture D is 5mm, F# is 15, the magnification of beam expander is 12.6 X. In this article, the coronagraph instrument system adopts the phase plate and the Lyot aperture and add the combination of the design and a deformable mirror is used to correct wavefront while a Lyot aperture is used for blocking the remnants of the star light, the introduction of the deformable mirror system can better eliminate both speckle noise and fixed optical surface error influences on imaging quality, also can correct the dynamic error.The design results show that: on the image plane, at the wavelength of requirement, the wavefront RMS value was less than 0.02λ, the result show that the wavefront error of the system reached the diffraction limit, it also means that the optical design of the whole system meet the design standard of coronagraph. ? 2019 SPIE.Accession Number: 20200408063364