Temperature control and vibration measurement of a MCT camera using a tube cyrocooler

Infrared astronomy has become an important branch of contemporary astronomy, and infrared telescope is the observation basis of infrared astronomy. In this paper the method and realization of low temperature control and vibration measurement of an infrared camera using MCT-25(Hg-Cd-Te) detectors are introduced. The MCT-25 detector is a refrigerated near-infrared detector, which needs to work at a temperature below 80K. In this paper, a tube refrigerator is used to refrigerate the detector at low temperature in vacuum chamber. In order to avoid damage of the cold optical lens caused by low temperature, two-stage temperature control is carried out on the base-plate of detectors and cold optics through temperature control circuit. The detector temperature is cooled to below 80K, and the temperature of cold optics is kept at 135K. The work of the refrigerator will cause small vibration of the detector, which will reduce the imaging quality of the camera. In this paper, the three-axis vibration of the detector is measured by mechanical method and optical method respectively, which provides data basis for the analysis of the influence of vibration on imaging and image correction.