光学 精密工程, 2011, 19 (10): 2319, 网络出版: 2011-11-09   

3~5 μm红外焦平面阵列的辐射定标

Radiance calibration for 3~5 μm infrared focal plane array
作者单位
1 中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
2 中国科学院 研究生院,北京 100039
3 长春理工大学 理学院,吉林 长春 130022
摘要
设计了一套红外焦平面阵列探测器的实验室辐射定标系统,以实现在对目标进行跟踪观测的同时得到目标的红外辐射特性。以高精度的面源黑体为标准辐射源,对在3~5 μm成像的中波红外相机进行了响应度标定。首先,建立定标数学模型,确定定标流程; 然后,使用线性回归统计模型对响应度进行拟合和评估,并提出剔除局外点方法对拟合曲线进行优化; 最后,在外场对温度和特性已知的目标进行测量。通过对实验室得到的响应度曲线和大气透过率参数进行红外辐射特性数据的反演,得到实际测量值,其与理论值的相对误差小于3%。结果表明,该优化方法能有效改善红外焦平面阵列响应度非线性引起的反演不确定度。
Abstract
To get infrared radiance characteristics of a target while it was tracked, a radiance calibration system for infrared focal plane arrays (IFPA) was design. By taking a high-accuracy plane blackbody as a standard source, a mid-wave camera whose spectral response range is 3 μm to 5 μm was calibrated. Firstly, the calibration methodology was established and calibration procedures were decided. Then, the linear regression model was used to fit and evaluate the goodness of response and a eliminating the outlier method was taken to improve the fitting curve of the response. Finally, the target of known temperature and characteristics on the spot was measured in a field,and the actual observed value of infrared radiance characterization was obtained by fitting response curve and atmosphere transmittance. Calculation indicates that relative errors of the actual observed value to the theoretical value are less than 3%. The result confirms that proposed method can improve the uncertainty caused by the nonlinear of IFPA response.

李宁, 杨词银, 曹立华, 郭立红. 3~5 μm红外焦平面阵列的辐射定标[J]. 光学 精密工程, 2011, 19(10): 2319. LI Ning, YANG Ci-Yin, CAO Li-Hua, GUO Li-Hong. Radiance calibration for 3~5 μm infrared focal plane array[J]. Optics and Precision Engineering, 2011, 19(10): 2319.

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