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2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Peng, Wei Wu, Shixiang Ding, Lei Wang, Xianghua Hou, Yihe Liu, Jiaqing Tan, Chan Liu, Yuxuan Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9781457709111

This paper introduces a prototype grating spectrometer measuring atmospheric column carbon dioxide (CO2) with a 640x512 pixel indium gallium arsenide (InGaAs) focal plane array (FPA). The spectrometer achieves the spectral resolutions of 0.1 nm at 1.61μm CO2 band meets the measurement requirement. The structure of the spectrometer including optics and electronics has been described in this paper. The spectrometer features a relatively fast optics, f/1.8, which benefits the sensitivity, and combines a fine slit with a large planar reflective diffraction grating. The performance of the optical design is presented to demonstrate the optical system meets the requirements for spectral resolution and sensitivity. The 640x512 InGaAs FPA with a low noise acquisition system serves to provide low noise spectral signals. The 640x512 InGaAs FPA, 25 μm pixel size, is sensitive to 0.9μm-to-1.7μm short wave infrared (SWIR) band and features a 298 K temperature detectivity, D*, greater than 5×1012 cm -1√Hz/W. © 2012 IEEE.

关键词： Carbon dioxide

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Design and simulation of image compensation control system

Design and simulation of image compensation control system

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2013 International Conference on Mechatronics and Automatic Control systems, ICMS 2013

作者： Tan, Chan Ding, Lei Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9783319012728

Image compensation is a key to high resolution imaging. This paper designs and simulates an image compensation control system based on swing pointing mirror. The principle of pointing mirror compensation is presented and the mathematical model of pointing mirror's driving motor is established. Based on this model, a high accurate controller which consists of current loop and velocity loop is designed and simulated. Considering that there is disadvantage of traditional speed PID controller in dynamic performance, which is speed overshoot, the speed loop adopts pseudo derivative feed-forward (PDFF) controller. Theoretical analysis and simulation results show that the designed image compensation control system has good characteristic in following performance, dynamic response and noise resistance. © Springer International Publishing Switzerland 2014.

关键词： Controllers

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Numerical Validation of A Simple Dynamic Beam Filtration Strategy in Cone Beam CT

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集成技术 2025年第2期14卷 71-85页

作者： WANG Heran XIE Jixiong ZHU Jiongtao ZHANG Xin TAN Yuhang SU Ting GE Yongshuai Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Research Center for Advanced Detection Materials and Medical Imaging Devices Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Paul C.Lauterbur Research Center for Biomedical Imaging Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Key Laboratory of Biomedical Imaging Science and System Chinese Academy of SciencesShenzhen 518055China

For cone beam computed tomography(CBCT),there has long been a desire to modulate the intensity and distribution of the X-rays to accommodate the patient’s anatomy as the gantry rotates from one projection to *** would reduce both image artifacts and radiation ***,the current beam modulation setups,such as dynamic bowtie filters,may be too complex for practical use in clinical *** study aimed to investigate a simplified dynamic beam filtration strategy for CBCT imaging to reduce image artifacts and radiation *** this study,the beam filtration was designed to vary dynamically as the CBCT gantry rotates around the ***,two distinct components were integrated:the sheet filter part and the bowtie filter *** dynamic beam filtration setup has two working schemes,one is a combination of dynamic sheet filter and dynamic bowtie filter,denoted as dynamic filterdynamic bowtie(DFDB);the other is a combination of dynamic sheet filter and static bowtie filter,denoted as dynamic filter-static bowtie(DFSB).Numerical imaging experiments were performed for three human body parts:the shoulder,chest,and *** addition,the Monte Carlo simulation platform MC-GPU was used to generate the dose distribution *** showed that the proposed DFDB and DFSB beam filtration schemes can significantly reduce the image artifacts and thus improve the CBCT image *** on the scanned object,the total radiation dose could be reduced by 30%.The proposed simple dynamic beam filtration strategy,especially the DFSB approach,could be beneficial in the future to improve the CBCT image quality with reduced image artifacts and radiation dose.

关键词： dynamic filtration radiation dose reduction artifacts reduction cone beam computed tomography

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Atmospheric Pollution Monitoring Based on Fourier Transform infrared Spectrometer 2

Atmospheric Pollution Monitoring Based on Fourier Transform ...

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2nd International Conference on Optical imaging and Measurement, ICOIM 2023

作者： Sun, Jun Xu, Zhijing Lin, Yinghui Chen, Ren Wang, Zhanhu Shanghai Maritime University College of Information Engineering Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9798350358636

Air pollution has serious impacts on human health and the environment, thus accurate monitoring and analysis of air pollutants is of vital importance. As an efficient monitoring technology, the Fourier Transform infrared Spectrometer has played a wide role in the study of air pollution. This paper elaborates on the basic principles and working mechanisms of the Fourier Transform infrared Spectrometer and discusses the important role in air pollution monitoring, also analyzes the development trend of the Fourier Transform infrared Spectrometer in air monitoring. © 2023 IEEE.

关键词： Air pollution

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Introduction of high-speed data acquisition system scheme based on FPGA 3

Introduction of high-speed data acquisition system scheme ba...

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3rd International Conference on Electronic Information Engineering and Data Processing, EIEDP 2024

作者： Lin, Yinghui Xu, Zhijing Sun, Jun Chen, Ren College of Information Engineering Shanghai Maritime University Shanghai China Shanghai Institute of Technical Physics State Key Laboratory of Infrared Physics Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai China

ISBN: (纸本)9781510680531

Signal acquisition system is widely used in various fields of reality, due to the data acquisition rate and processor performance enhancement as well as the development of sensor arrays and other technologies, the data acquisition system acquisition and transmission of the signal is exponential growth, in order to solve the high-speed signal acquisition process of the large amount of data, real-time, transmission rate and other issues, the study of high-speed acquisition of signals as well as the transmission program has an important practical significance. FPGA is very suitable to be applied in high-speed signal acquisition system because of its characteristics. In this paper, we firstly introduce the composition of a typical high-speed signal acquisition system based on FPGA, and then briefly introduce the function and development process of each module of the system and introduce the mainstream programs used in several key modules. In engineering applications, different programs should be used in different modules in conjunction with the actual. © 2024 SPIE.

关键词： Field programmable gate arrays (FPGA)

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AHSI: The Hyperspectral Imager on China's GaoFen-5 Satellite 11

AHSI: The Hyperspectral Imager on China's GaoFen-5 Satellite

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11th International Symposium on Digital Earth, ISDE 2019

作者： Liu, Yin-Nian Sun, De-Xin Hu, Xiao-Ning Liu, Shu-Feng Cao, Kai-Qin Key Laboratory of Infrared System Detection and Imaging Technologies Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

The Advanced Hyperspectral Imager (AHSI) is a visible/short-wave infrared hyperspectral imager on China's GaoFen-5 satellite, which was launched on May 9th, 2018. The AHSI is the first spaceborne hyperspectral sensor that utilizes both the convex grating spectrophotometry and an improved three concentric-mirror (Offner) configuration. It has 60 km swath width, 30 m spatial resolution, 5-10 nm spectral resolution, and 330 spectral bands. Instrument performance was evaluated and validated through well-designed experiments on orbit. Results show that the performance of AHSI has met or exceeded predictions. The AHSI has outstanding capability of detecting and identifying different ground objects and in ecological environment monitoring and natural resource exploration. © 2020 Published under licence by IOP Publishing Ltd.

关键词： Spectroscopy

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Optical processing strategies for micro-imaging small-aperture Wolter mirrors 7

Optical processing strategies for micro-imaging small-apertu...

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7th Global Intelligent Industry Conference, GIIC 2024

作者： Li, Yaran State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9781510682986

The Wolter microscope, characterized by its high spatial resolution, large geometric solid angle, and broadband achromatic correction, serves as an ideal initial configuration for the next generation of X-ray imaging diagnostic techniques. Nevertheless, the development of small-aperture Wolter mirrors encounters significant challenges, which primarily hinder their widespread application. This article presents a design approach for micro-imaging small-aperture Wolter microscopes, considering both optical design principles and mirror preparation techniques. It reveals the intricate trade-off relationships among spatial resolution, collection efficiency, and the feasibility of optical processing. By effectively integrating optical principles with manufacturing practices, a staged development roadmap for small-aperture Wolter mirrors is proposed. Through technological convergence, the electroforming nickel preparation process can be gradually mastered. This article provides technical insights that can guide the design and development of high-quality hard X-ray Wolter microscopes. © 2024 SPIE.

关键词： Mirrors

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Design and implementation of high reliable spaceborne reconfiguration system

Design and implementation of high reliable spaceborne reconf...

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International Conference on Electronics Information and Emergency Communication

作者： Changpei Han Lei Zhang Yaopu Zou Minzhu Yang Key Laboratory of Infrared System Detection and Imaging Technology Shanghai China University of Chinese Academy of Sciences Key Laboratory of Infrared System Detection and Imaging Technology Shanghai China

ISBN: (纸本)9781509019984

As the improvement of the SRAM-based FPGA's production technology, the number of gates has reached 10 million-scale, it becomes more powerful, increasingly used in the space field. Due to the impact of space radiation, SRAM FPGA couldn't always be stable for space applications, it needs to strengthen reliability. High reliable spaceborne reconfiguration system is designed to ensure correct operation of the SRAM FPGA onboard. The system can achieve three functions: first, reconfiguring SRAM FPGA using external PROM or E 2 PROM memory; second, accepting the ground configuration file and coding it in Hamming method, then storing it in E 2 PROM; last, operating EDAC during idle time. The system can reduce the impact of SEU on SRAM FPGA, store different programs in E 2 PROM, realizing multiple functions in a single FPGA in different time. The cyclic EDAC function, not only guarantees configuration data correct in the E2PROM, but also achieves statistics of single event effect occurrence probability in external memory device, such as E2PROM.

关键词： Field programmable gate arrays Random access memory Single event upsets PROM Loading Reliability engineering

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Automatic multi-spectral image registration for Tiangong-2 wide-band imaging spectrometer

Automatic multi-spectral image registration for Tiangong-2 w...

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Tiangong-2 Remote Sensing Application Conference on technology, Method and Application

作者： Li, Liangji Liu, Xiaohua Huang, Xiaoxian Tang, Yuyu University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics of the Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9789811335006

Automatic multi-spectral image registration can improve the application efficiency and ability of remote sensing images while this technology is yet to be improved. Based on the remote sensing data of Tiangong-2 wide-band imaging spectrometer, the differences and similarities between multi-spectral images were analyzed in this paper. An edge extraction method with edge symmetry and non-directionality was proposed according to the neighborhood structure of image pixels. Using the edge information images, multi-spectral image registration was achieved through the measurement of mutual information. A contrast experiment was also set up to compare the effects of the proposed edge extraction method with those of several traditional edge extraction methods in image registration. The results showed that the registration precision of this method is higher, indicating that the extracted edge features were more stable among multi-spectral images. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Image registration

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640×512 InGaAs focal plane array camera for detecting 1.58μm absorption spectra of CO 2

640×512 InGaAs focal plane array camera for detecting 1.58...

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infrared, Millimeter-Wave, and Terahertz Technologies II

作者： Peng, Wei Wu, Shixiang Ding, Lei Wang, Xianghua Zhu, Xueqian Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences 500 Yutian Road Hongkou Shanghai China Vision Engineering Ltd Shanghai China

ISBN: (纸本)9780819493170

This Paper introduces a 640×512 InGaAs focal plane array (FPA) camera integrated into a grating spectrometer for measuring 1.58μm absorption spectra of CO2. To gain atmospheric CO 2 concentration by detecting short wave infrared of reflective sunlight from the earth surface has been demonstrated to be an effective way. A hyperspectral spectrometer is designed to detect 1.58μm absorption spectra of CO 2. The spectrometer is a grating spectrometer which is optimised to respond to the spectral range from 1.562 ∼ 1.592μ with spectral resolution of 0.1nm. For high sensitivity, F-number is determined to be 1.8. We designed a 640×512 InGaAs FPA camera system which can be coordinated with the grating spectrometer. The camera integrated a 640×512 InGaAs FPA with 25 μm pixel pitch. The 640×512 InGaAs FPA is sensitive to 0.9μm-to-1.7μm short wave infrared (SWIR) band and features a 298 K temperature detectivity, D *, greater than 5×10 12 cm-1√Hzâˆ•W. The 640×512 InGaAs FPA has characteristics of quantum efficiency no less than 70% at wavelength of 1.58 μm, pixel operability more than 99.91%, two gain modes and three integrat ion modes. The camera features 3Hz rate (exposure time) and 14-bit output. The FPA's embedded TEC module is controlled to keep the detector core at proper temperature. The detector core temperature could be adjusted to below 263 K for lower readout noise and dark current. A Universal Series Buses 2.0 (USB2.0) has been used to transmit spectral data and commands. Commands of window size, position, gain mode and integration time per frame can be sent by the USB2.0 interface. © 2012 SPIE.

关键词： Semiconducting indium gallium arsenide

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