Thermoelectric refrigeration focal plane device for space astronomical camera

Abstract

The invention discloses a thermoelectric refrigeration focal plane device for a space astronomical camera, and aims at solving the technical problems that a liquid nitrogen temperature control structure is complex, the size is large, the mass is large, and the CCD deep refrigeration temperature cannot be met. The device comprises a vacuum sealed focal plane box body, a flexible heat pipe, a satellite radiant cooling plate, a temperature controller and a detector assembly located in the focal plane box body. The top of the focal plane box body is provided with a glass window corresponding to the position of the detector assembly. The detector assembly comprises a detector assembly bottom plate, a lower-level thermoelectric refrigerator, an upper-level thermoelectric refrigerator and a CCD bearing piece which are sequentially bonded from bottom to top. A main thermistor and a bare chip detection CCD comprising a CCD photosensitive area and a CCD storage area are arranged above the CCD bearing sheet. One end of the flexible heat pipe is arranged at the bottom of the outer side of the focal plane box body, and the other end is embedded in the satellite radiant cooling plate. The temperature controller is used for receiving the temperature signal of the main thermistor and controlling the input current of the lower-level thermoelectric refrigerator and the upper-level thermoelectricrefrigerator according to the temperature signal.

Description

technical field [0001] The invention relates to a space astronomical camera, in particular to a thermoelectric cooling focal plane device for a space astronomical camera. Background technique [0002] In order to ensure the signal-to-noise ratio and photometric accuracy of the space astronomical camera for faint target detection, it is necessary to reduce the dark current of the CCD as much as possible, and the dark current is closely related to the operating temperature and temperature control accuracy of the CCD, so it is necessary to reduce the operating temperature of the CCD as much as possible , Improve temperature control accuracy. In the prior art, a liquid nitrogen temperature control structure is usually used. The liquid nitrogen temperature control structure is complex, large in size and high in mass, and liquid nitrogen is easy to evaporate and leak, which leads to a short service life and cannot meet the application of long-term astronomical observation. need. ...

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems in the prior art that the temperature control structure of liquid nitrogen is complex, large in size and high in mass, and liquid nitrogen is easy to evaporate and leak, which leads to its short service life and cannot meet the application requirements of long-term astronomical observation. Moreover, the existing liquid nitrogen temperature control structure is a passive focal plane cooling mode, which cannot meet the technical problems of CCD deep cooling temperature and temperature control accuracy requirements, and a thermoelectric cooling coke for space astronomical cameras is provided. surface device

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