中分辨率成像光谱仪焦平面设计方案设想

文中就中分辨率成像光谱仪的焦平面设计进行了分析,根据中分辨率成像光谱仪的谱段配置、微型组合滤光片研制难度、辐照分辨率、空间分辨率等具体情况,提出了详细的焦平面设想:在可见光波段焦平面(VIS FPA)采用镶嵌蓝光增强PIN二极管列阵,近红外焦平面(NIR FPA)采用红外增强PIN二极管列阵,读出采用CMOS多路读出及源跟随器输出结构,以相关双取样电路消除背景噪声、复位噪声和热噪声,每列探测器对应一路前置放大器;短波红外焦平面(SWIR FPA),探测器采用光伏HgCdTe器件,采用直接注入多路读出电路;长波红外焦平面(LWIR FPA),探测器采用光导HgCdTe器件,读出电路为与光敏元一一对应的前置放大器,主放大器,然后以模拟开关变为串行输出,文中还就各FPA的信噪比、量子效率、串音等进行了分析,提出了各焦平面的最佳工作温度、响应率和一致性等要求。

A PRIMARY DESIGN FOR FOCAL PLANE ARRAYS OF MODERATE RESOLUTION IMAGING SPECTROMETER(MODIS)

This paper provides an overview of design for FPAs of the MODIS and details of FPAs. The design is based on spectral coverage, spectral resolution, spectral stability, spatial resolution, radiometric performance and difficulty of dielectric bandpass micro - filters manufactured. Detectors of visible( VIS) bands are PIN array in responsive to blue enhanced. The detectors of near infrared(NIR) bands are PIN array in responsive to red enhanced. A buffered multiplexer provides individual CMOS amplifiers for each photo-diode, correlated double sampling removes integrator offsets and suppresses low frequency noise. Short - wavelength infrared FPAs is made of photovoltaic (PV) HgCdTe detectors. Long - wavelength infrared (LWIR) FPAs is made of photoconductive (PC) HgCdTe detectors. There are 50 pixels, which each pixel has a readout circuit, a preamplification, an amplification respectively in LWIR FPAs. Outputted by analog multiplexer last. This paper provides an analysis of signal- to- noise ratio, quantum efficiency and crosstalk, provides requirements of each FPAs operating temperature, responsivity and uniformity, etc.