拼接型短波红外探测器的光谱响应特性  

Spectral responsivity of mosaic SWIR detectors

作　　者：廖清君[1] 胡晓宁[1] 黄爱波[1] 陈洪雷[1] 叶振华[1] 丁瑞军[1] Liao Qingjun;Hu Xiaoning;Huang Aibo;Chen Honglei;Ye Zhenhua;Ding Ruijun(Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China)

机构地区：[1]中国科学院上海技术物理研究所中国科学院红外成像材料与器件重点实验室,上海200083

出　　处：《红外与激光工程》2023年第9期65-72,共8页Infrared and Laser Engineering

摘　　要：红外探测器的光谱响应一致性影响高光谱成像仪器的动态范围,研究高光谱成像用拼接型短波红外探测器在同一光谱维的响应均匀性对提高高光谱成像性能有重要意义。通过测量相对光谱响应和窄带响应,对响应波段为1.0~2.5μm、规格为2000×256的碲镉汞短波红外探测器光谱响应率进行测量和分析,提出用光谱响应非均匀性定量化分析光谱响应一致性。分析了在80℃和140℃不同的黑体温度下,窄带滤光片的中心波长和半带宽不同时,带外截止深度为OD3时,带外信号对窄带性能测试误差的影响。通过测量探测器模块的光谱响应率,计算拼接的2000×256探测器在1μm、1.9μm和2.5μm处的响应非均匀性分别为6.23%、6.06%和4.07%。光谱响应率的准确测量实现了拼接型短波红外探测器的光谱响应一致性的定量化评价,有利于探测器在高光谱成像中的合理应用。Objective Hyperspectral imaging can not only get the two-dimensional geometric spatial information of the observed objects,but also obtain the continuous high-resolution spectral information which can reflect the physical and chemical characteristics of the target.It is a very important method for target detection and recognition based on hyperspectral remote sensing information.Spectral range of typical imaging spectrometer is 0.4-2.5μm due to the ground objects'reflection of solar radiation.Mercury Cadmium Telluride(Hg_(1-x)Cd_(x)Te)detectors cover a bandwidth of 0.8-30μm as the alloy composition of Hg_(1-x)Cd_(x)Te material is tuned in terms of cut-off wavelength.Hg_(1-x)Cd_(x)Te detectors are the major part of the imaging spectrometer for detection in short waveband.As the swath width of the imaging spectrometer increased,larger scale infrared focal plane array(IRFPA)is needed.Mosaic ultra-large scale shortwave infrared(SWIR)detectors can meet the demand for wide field of view detection in space application.The detector modules for butting have their own spectral responsivity.Hyperspectral imaging demands that the mosaic IRFPA has high uniformity of the spectral response.Therefore,it is necessary to measure and analyse the spectral responsivity specification of the mosaic IRFPA accurately and quantitatively for the hyperspectral imaging application.For this purpose,a method for evaluating the absolute spectral responsivity of the mosaic SWIR detectors is proposed in this paper.Methods This paper presents a method for measuring the absolute spectral responsivity accurately and quantitative analysis of the spectral responsivity specification of the mosaic 2000×256 SWIR detector for imaging spectrometer.The relative response spectrum is measured by a precisely calibrated grating monochromator system.Five optical filters with different center wavelength(CW)and full width at half maximum(FWHM)were chosen to analyze and measure the narrow band responsivity(Tab.1).The center wavelength of the filter is 1225 nm,16

关 键 词：高光谱成像 光谱响应 定量化分析 短波红外探测器 碲镉汞 

分 类 号：TN215[电子电信—物理电子学]