Thermostatic control method and thermostatic control device for photodiode

Abstract

The invention relates to a thermostatic control method and a thermostatic control device for a photodiode. The thermostatic control method comprises the following steps: arranging the photodiode in a photodiode clamp, detecting the temperature of the photodiode by using a temperature sensor, converting an electrical signal of the temperature into a digital signal through an analog-to-digital converter, processing the temperature signal by a digital signal processor, controlling the output of the analog-to-digital converter by using a proportional-integral-differential incremental algorithm, controlling a pulse width modulation power driving circuit, and driving a semiconductor refrigerator to control the temperature of a photodiode module. The temperature control of the semiconductor refrigerator comprises bidirectional heating and refrigerating, the controlled temperature can be set and adjusted through an RS 232 serial interface, and the temperature can be read in real time. The whole device is a closed loop control system, can accurately control the temperature of the photodiode to ensure that the photodiode works in constant gain, and is applicable to the thermostatic control of an APD photodiode detector.

Description

technical field [0001] The invention relates to a photodiode constant temperature control method and device, belonging to the field of temperature control. Background technique [0002] It is known that photoavalanche diodes are usually used in photoelectric detection, and require relatively high sensitivity, because their own gain is greatly affected by temperature, which requires temperature compensation control. [0003] At present, the method of adjusting the bias voltage of the photodiode is generally used for temperature compensation of photo avalanche diodes, but externally provided bias voltage control usually requires a bias voltage of tens to 100V, and there are also quite high requirements for the accuracy of bias voltage control, all of which require It can be realized through a series of complex peripheral circuits. [0004] The Chinese Utility Model Patent No. 200420034040.X discloses an avalanche photodiode temperature bias voltage testing device, which compe...

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Problems solved by technology

[0006] In order to overcome the circuit complexity and accuracy problems caused by temperature compensation of photodiodes by controlling the bias voltage, the purpose of the present invention is to provide a photodiode constant temperature control method and device, which can ensure that the photodiodes work at a constant gain , even when the ambient temperature changes greatly, it can also control the temperature precisely

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