Single-photon detection system and temperature control method thereof

Abstract

The invention discloses a single-photon detection system. The single-photon detection system comprises a refrigeration unit, a temperature sensing unit, a processor unit, a temperature control unit and a voltage control unit, wherein a semiconductor cooler and an avalanche photodiode are arranged inside the refrigeration unit, refrigeration is conducted on the avalanche photodiode in the refrigeration unit through the semiconductor cooler, the temperature sensing unit comprises at least two thermo-sensitive resistors used for sensing the internal temperature and the external temperature of the refrigeration unit to obtain temperature data, the processor unit receives and processes the temperature data sensed through the temperature sensing unit, the temperature control unit controls the target temperature of the semiconductor refrigeration cooler in the refrigeration process, and the voltage control unit controls the reverse bias of the avalanche photodiode. According to the single-photon detection system, the target temperature of refrigeration system PID temperature control can be adjusted according to the external temperature, and therefore the refrigeration efficiency of the refrigeration system and the performance of the single-photon detector are improved. The invention further discloses a temperature control method of the single-photon detection system.

Description

technical field [0001] The invention relates to the technical field of single-photon detectors, in particular to a single-photon detection system and a temperature control method thereof. Background technique [0002] With the application range of single photon detectors becoming wider and wider, the requirements for the applicability of single photon detectors are also getting higher and higher. Since APD (Avalanche Photodiode), the core device in the single photon detector, must work under low temperature conditions, high requirements are placed on the cooling system of the system. The current mainstream single-photon detector cooling scheme generally adopts PID (proportional, integral, differential) temperature control. PID temperature control can always stabilize the working temperature of APD at a certain temperature when the ambient temperature changes. However, the traditional PID temperature control also has some defects, that is, it must reserve a certain temperat...

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Problems solved by technology

This feature also leads to another defect of the PID temperature control technology: when the ambient temperature of the single photon detector changes, such as in an outdoor low temperature environment, the refrigeration system has the ability to provide a lower APD operating temperature, thus Make the detector get better performance, but PID can only make the system work at a fixed set value, which is actually a waste of the cooling efficiency of the refrigeration system

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