Gated complementary type photon counting system

Abstract

The invention discloses a gated complementary type photon counting system, which comprises a clock circuit module, an active quenching detection module, a register module and a processing module. Theclock circuit module comprises a frequency-locked loop circuit and a non-overlapping clock generation module. The active quenching detection module comprises a plurality of detection units. Each detection unit comprises an APD detector, an active quenching circuit and a counter. The detection units are arrayed in order. The detection units in odd locations and the detection units in even locationsform two detection arrays respectively. The complementary type photon counting system is applied to the high-speed single photon counting imaging field, and can effectively suppress unfavorable influence of afterpulse effect, dark counting and crosstalk between the detection units on detection rate, thereby improving photon counting detection rate and accuracy.

Description

technical field [0001] The invention relates to the technical field of high-speed single-photon counting imaging, in particular to a gated complementary photon counting system. Background technique [0002] The low-light detection technology for precise detection of weak light signals in nature has been widely used in scientific research, production and life, such as biomedicine, optical fiber communication, high-speed imaging measurement, immune detection and environmental radiation detection. The expansion and deepening of such applications have put forward higher and higher requirements for high-sensitivity detectors and their detection technologies. In recent years, the avalanche photodiode (Avalanche Photodiode, APD), a solid-state photosensor, has greatly promoted the development of single-photon detection technology due to its excellent sensing performance. When the APD is biased in the Geiger Mode (Geiger Mode, GM) where the reverse bias voltage exceeds its reverse ...

AI Technical Summary

Problems solved by technology

The period from the quenching circuit to suppress the avalanche to reset the avalanche to be tested is the dead time. Due to the existence of the dead time, the traditional detection mode cannot achieve continuous detection; in addition, the traditional detection mode often has gaps between adjacent pixels. The optical crosstalk problem, that is, the phenomenon that the avalanche event triggered on the APD is caused by the avalanche event of another adjacent APD

Therefore, there are thermal noise dark counts and post-pulse effects and the influence of crosstalk between pixels on the detection rate of the system

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