| 制冷型热红外焦平面成像系统数据处理的关键技术 |
| 投稿时间：2014-03-27 修订日期：2014-04-10 点此下载全文 |
| 引用本文：王湘波,陈小文,李春来,姬弘桢,王建宇.制冷型热红外焦平面成像系统数据处理的关键技术[J].红外,2014,35(5):7~12 |
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| 基金项目:国家高技术发展计划(863计划)课题(2012AA121102) |
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| 中文摘要:长波红外(8~12.5 μm)焦平面的性能在很多方面弱于中短波红外器件，其非均匀性及盲元状况较严重。本课题首次在国内引进了法国Sofradir公司的320×256像元HgCdTe长波红外焦平面探测器MARS VLW RM4，其波长响应范围为7.7~12 μm。基于一套高帧频低噪声信息获取系统，经过动态范围标定，实现了一套动态范围为250~330 K、噪声等效温差(Noise Equivalent Temperature Difference, NETD)小于50 mK的热红外成像系统。针对焦平面各像元的响应特性，研究了适用于热红外成像系统的非均匀性及盲元校正方法，提出了基于辐射定标的非均匀性校正和盲元检测。经实验验证，其校正效果优于两点定标法，且易于工程实现，基于辐射定标的结果可实现精确的温度反演。 |
| 中文关键词:热红外焦平面 热红外成像系统 辐射定标 盲元检测 非均匀性校正 |
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| Key Techniques of Data Processing for Cooled Thermal Infrared Focal Plane Array Imaging System |
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| Abstract:A long wave infrared (8-12.5 μm) focal plane array can not operate better than medium and short wave ones in many respects. Its non-uniformity and blind-pixel problems are quite serious. A MARS VLW RM4 320×256 HgCdTe long wave infrared focal plane array detector with a wavelength response range from 7.7 μm to 12 $\upmu$m is imported from Sofradir Company in France. On the basis of a high frame frequency and low-noise information acquisition system of which the dynamic range is calibrated, a thermal infrared imaging system is developed. Its dynamic range is from 250 K to 330 K and Noise Equivalent Temperature Difference (NETD) is less than 50 mK. According to the response characteristics of the pixels in the array detector, the non-uniformity and blind-pixel correction method suitable for thermal infrared imaging systems are studied. A non-uniformity and blind-pixel detection method based on radiation calibration is put forward. The experimental result shows that the method is better than the two-point method. It is easy to be implemented in engineering. The result based on radiation calibration is useful for more precise temperature inversion. |
| keywords:thermal infrared focal plane thermal infrared imaging system radiation calibration blind pixel detection non-uniformity correction |
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