Sentinel 5 Precursor TROPOMI-SWIR HgCdTe探测器的在轨像素退化
In-flight pixel degradation of the Sentinel 5 Precursor TROPOMI-SWIR HgCdTe detector
AI总结：
本文研究了Sentinel-5 Precursor TROPOMI-SWIR HgCdTe探测器在轨五年的像素退化情况，发现受损像素多能自发恢复，满足质量要求的像素比例始终超98.7%，为未来空间仪器探测器选择提供参考。
摘要：
自2017年10月发射以来，Sentinel-5 Precursor任务上的TROPOMI-SWIR HgCdTe探测器一直在执行地球大气分子吸收的在轨测量。在其极地轨道中，该探测器持续暴露于潜在有害的高能粒子中。在阴影期间进行的校准测量被用于检查该探测器的性能。本文探讨了HgCdTe探测器的在轨退化情况。五年后，尽管像素持续受到宇宙辐射撞击，探测器仍在规格范围内运行。大部分撞击没有产生持久影响，且大多数受损像素（95%）似乎在几天到几个月内恢复，这归因于HgCdTe探测器材料中缺陷的缓慢自发恢复。这是在140 K的工作温度下观察到的。观察到的恢复时间分布平均值约为九天，并具有长达数月的显著长尾。已经退化的像素有显著概率再次退化。故障像素的位置在探测器上遵循泊松分布。未出现新的集群，表明撞击主要由能量相对较低的质子和电子主导。由于观察到的像素自发恢复，在标称运行阶段满足所有质量要求的像素比例始终超过98.7%。观察到的TROPOMI-SWIR探测器在轨性能，为未来空间仪器的HgCdTe探测器确立了在轨撞击选择标准。
英文摘要：
The TROPOMI-SWIR HgCdTe detector on the Sentinel-5 Precursor mission has been performing in-orbit measurements of molecular absorption in Earth's atmosphere since its launch in October 2017. In its polar orbit the detector is continuously exposed to potentially harmful energetic particles. Calibration measurements taken during the eclipse are used to inspect the performance of this detector. This paper explores the in-orbit degradation of the HgCdTe detector. After five years, the detector is still performing within specifications, even though pixels are continuously hit by cosmic radiation. The bulk of the impacts have no lasting effects, and most of the damaged pixels (95%) appear to recover on the order of a few days to several months, attributed to a slow spontaneous recovery of defects in the HgCdTe detector material. This is observed at the operational temperature of 140 K. The distribution of the observed recovery times has a mean around nine days with a significant tail towards several months. Pixels that have degraded have a significant probability to degrade again. The location of faulty pixels follows a Poissonian distribution across the detector. No new clusters have appeared, revealing that impacts are dominated by relatively low energetic protons and electrons. Due to the observed spontaneous recovery of pixels, the fraction of pixels meeting all quality requirements in the nominal operations phase has always been over 98.7%. The observed performance of the TROPOMI-SWIR detector in-flight impacts selection criteria of HgCdTe detectors for future space instrumentation.
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