基于哈特曼波前传感器的非制冷红外成像光学读出系统

提出了一种新的基于哈特曼波前传感器(SHWS)的光学读出系统。该系统利用SHWS探测焦平面阵列(FPA)单元在受热前后反射波前斜率的变化量重构被探测物体的红外辐射图像。在理论上详细讨论其成像性能后,实验获得了单元尺寸为60 μm×60 μm,阵列大小为34 pixel×38 pixel的高温物体红外图像,其噪声等效温度差(NETD)约为3.8 K。优化系统参数设计,可以提高哈特曼波前传感器对到达角的测量精度进而获得更小的噪声等效温度差。

Abstract

An optical readout system based on Hartmann-Shack sensor is introduced. This system uses Shacke-Hartmann wavefront sensor (SHWS) to detect the wavefront gradient variance of focal-plane array (FPA) cell before and after being heated and then reconstructs the IR image of object being detected. After vividly discussing its imaging capability theoretically, we obtain the infrared image of a high-temperature object with cell size 60 μm×60 μm and array size 34 pixel×38 pixel in experiment. Its noise equivalent temperature difference (NETD) is about 3.8 K. If system parameters are optimized, the measurement accuracy of SHWS for arriving angles can be improved and thus smaller NETD can be attained.

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马晓燠, 樊志华, 饶长辉, 钱见, 史海涛. 基于哈特曼波前传感器的非制冷红外成像光学读出系统[J]. 光学学报, 2009, 29(2): 490. Ma Xiaoyu, Fan Zhihua, Rao Changhui, Qian Jian, Shi Haitao. Application of Hartmann-Shack Sensor in Optical Readout System of Uncooled Infrared Imaging[J]. Acta Optica Sinica, 2009, 29(2): 490.

基于哈特曼波前传感器的非制冷红外成像光学读出系统

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