红外目标光谱辐射亮度测试技术

Testing technology of spectral radiance of infrared target

红外目标光谱辐射亮度对于武器光电系统的搜索、跟踪及目标识别都具有重要的应用。以红外辐射理论为基础,在同温度、同波长下采用红外傅里叶分光法并与标准黑体相比较的方法对红外目标光谱辐射亮度进行了测试技术研究,建立了红外目标光谱辐射亮度计量测试装置。根据实验结果分析,该装置在波长范围2.5-14μm,1 000℃、3 000℃、5 000℃、7 000℃四个温度点条件下,测量误差为±1%,在5 000℃、7 000℃时,测量误差小于0.1%。分析讨论了对测量结果产生影响的因素,得出当标准黑体温度与被测红外目标温度不一致时,会给测量带来较大误差;在3.0-5.4μm范围内,分别选用In Sb和MCT两种探测器,产生的偏差为±0.5%。

Spectral radiance of infrared targets are widely used in weapon photoelectric： search, track and identify targets. Based on infrared radiate theory, the technologies of Fourier transform infrared spectroscopy （PTIR） and comparing with standard blackbody source were used tc measure spectral radiance of infrared targets at the same temperature and wavelength. The spectral radiance measurement system of infrared targets was also built. According to the results, it is shown that the measurement error is ±1% at 1 000 ℃, 3000℃, 5000 ℃, 7000 ℃ temperature point and the measmement error is less than 0.1% at 5000℃, 7000℃ temperature point at the range of 2.5-14 μm. Some factors that affect the measurement accuracy of the infrared spectral radiance were analyzed and discussed. It is obtained that the measurement error is greater when the standard black body temperature is inconsistent with the infrared target temperature; the measurement deviation is 4-0.5% with InSb and MCT detector respectively at the range of 3.0-5.4 μm.