Theoretical Calculations for Liquid Nitrogen Dewar in Separate CCD Camera

Liquid nitrogen dewar of the separate CCD camera is mainly used in astronomical telescope imaging system,using phase-change cooling to provide suitable working temperature and reliable environmentally protective support and packaging for the CCD detector. The thermal bridge between the liquid nitrogen storage and the loading platform of the CCD detector is theoretically calculated and compared with the measured value to obtain a revised value. Then it can be applied to make structural adjustment,obtaining products which are suitable for practical applications.