【摘要】 针对噪声等效温差(NETD)工程化测试要求,设计一套可对NETD自动测试的系统和方法。该系统采用离轴非球面折叠光路,设计出口径120 mm,焦距720 mm的平行光管,大幅减少系统体积。采用热电制冷器TEC作为黑体的电控加热和制冷源,实现温控精度0.05℃的黑体辐射。通过改进的测试算法,测试时间只需要5 s左右,大幅提高检测效率。经与CI测试系统对比测试,结果表明:NETD测量一致性好,准确度高,具有工程化应用价值。更多还原

【Abstract】 For the requirements of NETD measurement in engineering,an automatically testing method and system for NETD are designed. This system uses off-axis aspheric two-double light route. A collimator with 120 mm aperture and 720 mm focus is designed,which can reduce the volume of system. Black body uses TEC as source for heating and refrigerating. Temperature control precision reaches 0. 05 ℃. Testing time is only 5 s by improving algorithm,which can improve the detection efficiency. Compared with CI system,the consistency and precision of NETD measurement are good. This system has an application value in engineering.更多还原