A single-photon detection system with post-pulse correction

Abstract

The invention provides a single photon detection system with post-pulse correction function. It is characterized in that it consists of a bias voltage generating circuit 1, a single photon avalanche photodiode 2, a passive quenching readout circuit 3, a post-pulse correction circuit 4 and a single photon counter 5, wherein the passive quenching readout circuit 3 consists of the first A resistor 31 and a first voltage comparator 32 are formed, and the rear pulse correction circuit 4 is composed of a pulse correction control and generation circuit 41, an N-type field effect transistor 42, a second voltage comparator 43, a third voltage comparator 44, a second resistor 45 and capacitor 46 form. The invention can be used to eliminate the influence of the post-pulse effect on the single-photon detector system, and can be widely used in the fields of laser radar ranging, fluorescence lifetime detection, medical imaging and other extremely weak light detection.

Description

[0001] (1) Technical field [0002] The invention relates to a single-photon detection system with a post-pulse correction function. The invention can be used in the fields of laser radar ranging, fluorescence lifetime detection, medical imaging and other extremely weak light detection, and belongs to the technical field of single-photon detection. [0003] (2) Background technology [0004] Single-photon avalanche photodiodes (SPADs) are optoelectronic devices based on the intrinsic photoelectric effect. When the applied reverse bias voltage is greater than the avalanche breakdown voltage, a single photon incident on the single photon avalanche photodiode will cause an avalanche-like current multiplication. At this time, the single photon avalanche photodiode works in Geiger mode (also called single photon mode). In this mode, the internal gain of the single-photon photodiode is very high, which can reach 10 6 above. Due to the huge gain, the sensitivity of single-photon ava...

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Problems solved by technology

There are following defects and deficiencies in the above-mentioned invention: 1. The above-mentioned post-pulse correction method can only be used for the single-photon avalanche photodiode working in the gating mode, for the application fields where the signal photon arrival time is unknown, such as light intensity detection, laser radar Distance measurement, etc., will easily cause the loss of effective photon counting and increase the detection error of the system; 2. The photon counting with post-pulse effect will be directly eliminated, and it can only be processed after the data collection is completed, which reduces the detection efficiency and detection efficiency of the single photon detection system. real-time correction

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