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实验研究了8～14微米的HgCdTe 和PbSnTe 光伏探测器的热恢复过程与偏压、激光功率及辐射时间的函数关系。探测器用CO_2激光脉冲照射,脉冲的持续时间从0.2毫秒到200毫秒。数据由Tektronix 数字式示波处理系统记录和处理。还测量了每种光二极管的特性同温度的函数关系。发现有显著的热退化出现。观察到此两种探测器的热恢复过程出现在两个不同的时间标度上:一种在毫秒数量级,另一种在几百毫秒数量级。把这些结果同早先的HgCdTe 光导探测器的结果作了对比。分析表明,这两种热恢复时间同探测器与支座的热性能以及支座与受热器的接合有关。还讨论了每种热恢复过程对偏压研究或照射时间研究的相对重要性。
The thermal recovery of HgCdTe and PbSnTe photodetectors (8-14 μm) was experimentally studied as a function of bias voltage, laser power and irradiation time. The detector was irradiated with CO 2 laser pulses with a pulse duration of 0.2 ms to 200 ms. Data is recorded and processed by the Tektronix digital oscillometric system. The characteristics of each photodiode were also measured as a function of temperature. Found to have significant thermal degradation appears. The thermal recovery of these two detectors was observed to occur on two different time scales: one on the order of milliseconds and the other on the order of hundreds of milliseconds. The results are compared with the results of the earlier HgCdTe photoconductivity detector. The analysis shows that these two heat recovery times are related to the thermal performance of the detector and support as well as the abutment and support of the heat sink. The relative importance of each thermal recovery process to the study of bias or irradiation time is also discussed.