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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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Acceleration of infrared Target detection via Efficient Channel Pruning

Acceleration of Infrared Target Detection via Efficient Chan...

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2021 International Conference on Robotics Automation and Intelligent Control, ICRAIC 2021

作者： Miao, Zhuang Zhang, Yong Li, Weihua Chen, Ruimin Key Laboratory of Infrared System Detection and Imaging Technology Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China School of Electronic Electrical and Communication Engineering University of Chinese Academy of Sciences Beijing100049 China

Deployment of modern detection models is difficult for infrared target detection used in robot vision systems due to their heavy computational burden. To alleviate this situation, a simple but efficient channel pruning method is proposed for model acceleration. Specifically, a soft-gated module combined with batch normalization (SGBN) is designed as a standalone layer to substitute the standard batch normalization (BN) layer during training. The conversion between SGBN and BN is easy, and the training overhead introduced is almost negligible after replacement. By controlling the sparsity of the scaling factor in SGBN, unimportant channels with small output are blocked automatically and globally, which is simultaneous with model training. Removing these redundant channels no longer requires fine-tuning, thus significantly speeding up the pruning process. Experiments of pruning different detection models on the infrared dataset show the effectiveness of our method. For example, the parameters and FLOPs of pruned CetnerNet are reduced by 72.70% and 40.20%, respectively, without accuracy loss. The inference speed on the CPU is 12.01ms faster. Extended studies on the classification task also demonstrate its great potential when transferring to other applications. © 2022 Institute of Physics Publishing. All rights reserved.

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Design of a wide-field target detection and tracking system using the segmented planar imaging detector for electro-optical reconnaissance

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Chinese Optics Letters 2018年第7期16卷 34-39页

作者：于清华武冬梅陈福春孙胜利 Shanghai Institute of Technical Physics of the Chinese Academy of Sciences Shanghai 200083 China Key Laboratory of Infrared System Detection and Imaging Technology Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China

Detecting and tracking multiple targets simultaneously for space-based surveillance requires multiple cameras,which leads to a large system volume and weight. To address this problem, we propose a wide-field detection and tracking system using the segmented planar imaging detector for electro-optical reconnaissance. This study realizes two operating modes by changing the working paired lenslets and corresponding waveguide arrays： a detection mode and a tracking mode. A model system was simulated and evaluated using the peak signal-to-noise ratio method. The simulation results indicate that the detection and tracking system can realize wide-field detection and narrow-field, multi-target, high-resolution tracking without moving parts.

关键词： FOV Design of a wide-field target detection and tracking system using the segmented planar imaging detector for electro-optical reconnaissance

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The development of infrared remote sensors for Chinese meteorological satellites

The development of infrared remote sensors for Chinese meteo...

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International Conference on infrared and Millimeter Waves

作者： Lei Ding Wei Lu Shanghai Institute of Technical Physics Key Laboratory of Infrared System Detection and Imaging Technology Shanghai China

ISBN: (纸本)9781479982738

Meteorological satellites have become an irreplaceable weather and ocean observing tool. Since the first Chinese polar-orbiting meteorological satellite Feng-Yun (FY-1A) was launched successfully in 1988, there are totally 13 meteorological satellites that were launched into both sun synchronous and geostationary orbit. China is among the few countries in the world which are simultaneously operating both orbiting meteorological satellites. All the satellites have been incorporated into the global constellations of operational meteorological satellites within the WMO framework. More satellites are under construction to be the second generation ones. The status of Chinese meteorological satellite mission is introduced in this paper.

关键词： Satellites Satellite broadcasting infrared sensors Remote sensing Radiometry Detectors imaging

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CO_2 Monitoring Spectrometer with 640×512 Pixel SWIR InGaAs Focal Plane Array

CO_2 Monitoring Spectrometer with 640×512 Pixel SWIR InGaAs...

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Symposium on Photonics and Optoelectronics

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

ISBN: (纸本)9781457709098

This paper introduces a prototype grating spectrometer measuring atmospheric column carbon dioxide (CO_2) with a 640×512 pixel indium gallium arsenide (InGaAs) focal plane array (FPA). The spectrometer achieves the spectral resolutions of 0.1 nm at 1.61μm CO_2 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 640×512 InGaAs FPA with a low noise acquisition system serves to provide low noise spectral signals. The 640×512 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 5×10~(12) cm~(-1)√Hz/W.

关键词： CO_2 InGaAs FPA Short-wave infrared High spectral resolution Grating spectrometer Low noise

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Encoding method of CGH for highly accurate optical measurement based on non-maxima suppression

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Chinese Optics Letters 2017年第11期15卷 41-45页

作者：肖锡晟于清华朱振涛胡凯陈桂林 Shanghai Institute of Technical Physics of the Chinese Academy of Sciences Shanghai 200083 China Key Laboratory of Infrared System Detection and Imaging technology Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China

The use of a computer-generated hologram（CGH） in interferometric testing provides new methods for highly accurate optical *** fabricate a CGH,polygons are used to approximate the smooth CGH *** the data size supported by CGH writing machines is limited,the number of polygon vertices must be ***,the CGH-encoding method determines the encoding *** realize a highly accurate optical measurement using CGHs,we propose a CGH-pattern-encoding method based on non-maxima suppression.A self-aligned CGH is designed to verify the *** experimental result shows that a highly accurate CGH can be fabricated using this method.

关键词： maxima suppression encoding aligned polygon fabricate deviation fabrication verify approximate

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Consistent Transfer Radiometric Calibration Technology for Optical Remotely Sensor and Field Campaign Validation

Consistent Transfer Radiometric Calibration Technology for O...

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Workshop on Hyperspectral Image and Signal Processing: Evolution in Remote Sensing, WHISPERS

作者： Ning Wang Yonggang Qian Lingling Ma Yinnian Liu Yaokai Liu Yongguang Zhao Chuanrong Li Lingli Tang Key Laboratory of Quantitative Remote Sensing Information Technology Academy of Opto-Electronics Beijing China Key Laboratory of Infrared System Detection and Imaging Technologies Shanghai Institute of Technical Physics Shanghai China

ISBN: (纸本)9781728152950

To accurately calibrate the remotely sensed data becomes one of the primary problems for different application of remote sensing. In this paper, consistent transfer radiometric calibration technology is proposed, and the related system composed of standard ground-based and airborne hyperspectral imagers with self-calibrator units, comprehensive references including different types of artificial targets and natural scenes, and benchmark transfer method have been developed. The uncertainty of this system has also been analyzed and an uncertainty of less than 4.5% could be reached by this system. To validate this system, a flight campaign taking place in National High-Resolution Comprehensive Calibration Site of China has been carried out, the results show that the ground-based and air-flight benchmarks were agree with the satellite measurement.

关键词： Calibration Benchmark testing Uncertainty Radiometry Hyperspectral imaging Atmospheric modeling Atmospheric measurements

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An improvement method of a lossless compression scheme for the datacube from Geostationary Interferometric infrared Sounder (GIIRS) and its FPGA implementation 9

An improvement method of a lossless compression scheme for t...

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9th IEEE Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2020

作者： Yang, Minzhu Hernandez, Raul Guerra Han, Changpei Feliciano, Jose Francisco Lopez China Jiliang University Key Laboratory of Electromagnetic Wave Information Technology and Metrology of Zhejiang Province College of Information Engineering Hangzhou China Instituto Universitario de Microelectrónica Aplicada Universidad de Las Palmas de Gran Ganaria Las Palmas Spain Chinese Academy of Science Key Laboratory of Infrared System Detection and Imaging Technology Shanghai China

This paper briefly described an improved method for the original proposed scheme based on Vector Quantization and Linear Prediction to further enhance the compression ratio while reduce the time cost. Given the fact that the interferograms belong to the same datacube are similar to each other, there are two obvious modifications in this paper: predict only once to get the general predicted coefficients for the same datacube;along with treat datacube rather than sequence as the encoded unit. The time consumption spent by Linear Prediction part will shrink about 35.55% by predicting just once. Moreover, the change of the encoded object makes the final compression ratio get a further rise range from 2.62% to 3.711%. © 2020 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Design, performance and in-orbit evaluation results of Tiangong-2 wide-band imaging spectrometer

Design, performance and in-orbit evaluation results of Tiang...

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

作者： Wei, Jun Ding, Lei He, Xianqiang Tang, Yuyu Feng, Xin Lin, Mingsen Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of Oceanography SOA Hangzhou310012 China National Satellite Ocean Application Service SOA Beijing100081 China Key Laboratory of Infrared System Detection and Imaging Technology Chinese Academy of Sciences Shanghai200083 China

ISBN: (纸本)9789811335006

The system design, performance and in-orbit evaluations of a push-broom wide-band imaging spectrometer (WIS) on Tiangong-2 space laboratory is introduced. The WIS has 100 m spatial resolution in ocean color bands (FOV is around 42°), which is the highest compared to other in-orbit ocean color sensors (GOCI, MODIS, VIIRS, and OLCI). Besides, WIS includes visible and near infrared (VNIR), shortwave infrared (SWIR) and thermal infrared (TIR) channels and has excellent performance in ocean color monitoring, and SNR in 0.4–0.8 μm is more than 400 at typical oceanic radiance. Average SNR at SWIR is more than 550 at typical atmosphere radiance. Moreover, the instrument’s average NE⊿T at TIR is lower than 20 mK, which is one of the best. The in-orbit tests reveal that the ocean color components retrieved by WIS are highly consistent with the results from the typical ocean color satellite sensors (MODIS, VIIRS and GOCI), but have finer structures due to higher spatial resolution. © Springer Nature Singapore Pte Ltd. 2019.

关键词： Dewars

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Atmospheric Pollution Monitoring Based on Fourier Transform infrared Spectrometer

Atmospheric Pollution Monitoring Based on Fourier Transform ...

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Optical imaging and Measurement (ICOIM), International Conference of

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

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.

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