Refrigeration detector and cold plate thereof

Abstract

The invention relates to a cold plate for a refrigeration detector, and the cold plate comprises a cold plate body, wherein the middle part of the cold plate body is provided with a cold finger part mounting area, the cold plate body is a square plate, at least one edge part is provided with a notch, and the notch is sunken from the corresponding edge part to the side where the cold finger part mounting area is located. In addition, the invention further relates to a refrigeration detector adopting the cold plate. According to the invention, the square cold plate body is adopted, and the edgepart of the cold plate body is emptied to a certain extent; the constraint effect on the stress and strain of the detector chip is increased through the corners of the cold plate, so the stress and strain generated by the detector chip under a huge temperature difference can be effectively reduced, the internal stress borne by the detector chip is reduced, the photoelectric performance of the detector chip is ensured, and the startup and shutdown reliability of the refrigeration detector is improved; meanwhile, the heat mass of the cold plate can be reduced, the working load of the refrigerator is reduced, the refrigeration time of the refrigeration detector is shortened, and the working performance of the refrigeration detector is correspondingly improved.

Description

technical field [0001] The invention belongs to the technical field of refrigeration detectors, and in particular relates to a cold plate used for a refrigeration detector and a refrigeration detector using the cold plate. Background technique [0002] The infrared cooling detector is mainly composed of two parts, the Dewar and the refrigerator. The chip, as the core device of the infrared detector, is packaged inside the Dewar. interface; the refrigerator provides an extremely low working environment temperature (liquid nitrogen temperature 78K or even lower) for the detector chip to work. [0003] The typical fixing method of the detector chip in the Dewar is: the ceramic substrate is mounted on the cold plate as a transition piece for the electrical signal, and the chip is mounted on the ceramic substrate as the core device. Due to the special temperature requirements of the infrared cooling detector chip, the chip needs to withstand the stress and strain caused by the t...

AI Technical Summary

Problems solved by technology

At present, the stress and strain of the chip under the huge temperature difference are mainly relieved by selecting the ceramic substrate and the cold plate material whose thermal expansion coefficient matches the chip as much as possible, but the improvement effect is limited, and the reliability of the infrared detector switch is difficult to be guaranteed.

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