Abstract

The 12.5μm long wave MCT infrared detector requires mK temperature control precision, which makes the temperature drift suppression problem of precision temperature measuring circuit prominent. Firstly, the temperature drift model of the precise temperature measuring circuit is established in this paper, and the influence of ambient temperature change on the accuracy of temperature measurement circuit is deeply analyzed. Secondly, according to the classical design parameters, the temperature drift model of temperature measurement circuit is simplified, and the main influence parameters of temperature drift are determined by the first level operational amplifier and reference voltage reference, therefore, some suggestions are proposed to reduce the temperature drift of precision temperature measurement circuit. Finally, the test results show that the output of precision temperature measurement circuit drifts 16mK with every 1°C change of ambient temperature. The test data is consistent with the theoretical analysis results, which proves the correctness of the temperature drift model. The temperature drift model provides an important design method for the temperature drift suppression of precision temperature measurement circuit.

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