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Practical limit of the accuracy of radiometric measurements using HgCdTe detectors

机译：使用HgCdTe探测器进行辐射测量精度的实际限制

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摘要

The spectral responsivity of HgCdTe detectors operating in the thermal infrared region was observed to drift slowly with time. The characteristics of the drift were investigated and were shown to have a different origin from the drifts previously reported by one of the authors. Those drifts were caused by a thin film of water ice depositing on the active area of the cold detector. The source of the new drift is far more serious because it is fundamental, making the acquisition of accurate radiometric measurements with these detectors very difficult. It is demonstrated that the source of the new drift is the nonlinearity in the response of the HgCdTe detectors, coupled with the fluctuations of the irradiance reaching them. These fluctuations are due to variations in the thermal background caused by changes in the temperature of objects in the field of view of the detectors. This phenomenon is expected to provide a practical limit to the accuracy of radiometric measurements using not only HgCdTe detectors but also other detectors whose linearity is a function of the thermal background.
机译：观察到在热红外区域工作的HgCdTe检测器的光谱响应随时间缓慢漂移。对漂移的特性进行了研究，结果表明该漂移源与一位作者先前报道的漂移具有不同的起源。这些漂移是由冷探测器活动区域上沉积的水冰薄膜引起的。新漂移的来源更为严重，因为它是根本原因，这使得用这些探测器采集准确的辐射测量值非常困难。结果表明，新漂移的根源是HgCdTe检测器响应的非线性，以及到达它们的辐照度的波动。这些波动是由于探测器背景中物体温度变化引起的热背景变化所致。预期这种现象不仅会使用HgCdTe检测器，而且还会使用线性度是热本底的函数的其他检测器，对放射测量的准确性提供实际的限制。

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