宽谱段高分辨率低温成像光谱仪制冷系统设计

宽谱段高分辨率低温成像光谱仪可对星际矿物成分、大气成分进行有效识别,但由于深空探测目标温度很低,为了抑制光谱仪自身噪声,提高分辨率,需要红外谱段工作在几十K的低温环境下,这对制冷系统设计提出了严峻的挑战。在调研国外用于金星、彗星探测的可见/红外成像光谱仪(VIRTIS)制冷技术的基础上,对宽谱段高分辨率低温成像光谱仪制冷系统进行了设计与仿真分析,仿真结果显示M和H探测器部件温度梯度非常小,约为410-2 K;探测器工作温度70 K;M和H部件壳体温度为1301 K;框架温度为2001 K,符合制冷系统设计要求。研究成果对在深空探测领域具有通用性的低温高光谱成像系统中制冷系统的研制具有一定的指导意义。

Cooling system design for cryogenic imaging spectrometer with wide spectrum and high resolution

Cryogenic imaging spectrometer with wide spectrum and high resolution can be used to detect interplanetary mineral component and atmospheric composition. Due to the temperature of detected target in space exploration is very low, the infrared spectra in imaging spectrometer has to work in cryogenic environment to limit the noise from the imaging spectrometer itself to promote its spectral resolution. That is a challenge for the design of cooling system. Based on survey results about the cooling system of VIRTIS for Venus and Comet, the cooling system for cryogenic imaging spectrometer with wide spectrum and high resolution was designed and simulated. The simulation results show the temperature gradient of M and H detector is only 410-2 K. Detector temperature is less than 70 K. The shell temperature is 1301 K and frame temperature is 2001 K. All the results demonstrate the designed cooling system meets the design requirements. The results are significant for cooling system design in cryogenic imaging spectrometer, which is used widely in space exploration.