Laboratory and In-Flight Measurements at 10-55 K of InSb Near-Infrared Detector Performance for the Warm Mission of the AKARI Satellite
Laboratory and In-Flight Measurements at 10-55 K of InSb Near-Infrared Detector Performance for the Warm Mission of the AKARI Satellite
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AKARI 卫星热任务中 10-55 K InSb 近红外探测器性能的实验室和飞行中测量
DOI：
10.1086/661664
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发表时间：
2011
影响因子：
3.5
通讯作者：
森達哉
中科院分区：
文献类型：
--
作者：
Tamura;N. ; Takato;N. ; Iwamuro;F. ; Akiyama;M. ; Kimura;M. ; Tait;P. ; Dalton;G. B. ; Murray;G. J. ; Smedley;S. ; Maihara;T. ; Ohta;K. ; Moritani;Y. ; Yabe;K. ; Sumiyoshi;M. ; Totani;T. ; Sugai;H. ; Karoji;H. ; Wang;S.-Y. ; Ohyama;Y.;T.Sugawa;前澤裕之;K. Kuwada and R. Philipowski (K. Kuwada);森達哉
日本红外天文卫星AKARI的暖使命阶段在其180升液氦制冷剂耗尽后已经开始。从那时起，我们用红外相机（IRC）进行了近红外观测，而望远镜正在慢慢升温。为了探索在更高温度下继续观测的可能性，我们评估了InSb探测器阵列的性能，这是IRC的飞行备份模型，在实验室中在10 K和55 K之间的各种工作温度下。通过将实验室测量与AKARI/IRC探测器阵列的飞行测量相结合，我们一致地得出了相对灵敏度、暗电流、总噪声和热像素数量随工作温度的变化。在10 K ~ 40 K的温度范围内，它们都有很小的变化.然而，在温度高于40 K时，暗电流和热像素的数量开始迅速增加，而相对灵敏度下降，总噪声逐渐增加。我们获得的性能对偏置电压的依赖性，建议未来AKARI温暖的阶段的最佳操作。
The warm mission phase of AKARI, the Japanese infrared astronomical satellite, has started after its 180 liter liquid helium cryogen was exhausted. Since then, we have conducted near-infrared observations with the Infrared Camera (IRC), while the telescope is slowly warming up. To explore the possibility of continuing observations at higher temperatures, we evaluate the performance of the InSb detector array, a flight backup model for the IRC, in a laboratory at various operating temperatures between 10 K and 55 K. By combining the laboratory measurements with the in-flight measurements of the AKARI/IRC detector array, we consistently derive the changes of relative sensitivity, dark current, total noise, and the number of hot pixels with operating temperature. All of them show small changes in a range of temperature from 10 K to 40 K. However, at temperatures above 40 K, the dark current and the number of hot pixels start to increase rapidly, while the relative sensitivity decreases and the total noise increases gradually. We obtain the dependence of the performance on bias voltages to suggest an optimal operation for a future AKARI warmer phase.