Single point sampling decision single photon detector and its sampling decision method

Abstract

A single-point sampling decision single-photon detector, comprising an APD circuit, a sampling circuit, a digital signal processing circuit, a storage circuit, a control circuit, a detection clock circuit and a sampling clock circuit, the output of the APD circuit is sequentially connected to the sampling circuit and digital signal processing circuit, the control circuit reads the data processing result and controls the steps, the control circuit controls the phase shift amount of the sampling clock output by the sampling clock circuit, the output of the detection clock circuit provides a homologous clock for the APD circuit and the sampling clock circuit, and the sampling clock circuit will shift the phase The detected detection clock is output to the sampling circuit as a sampling clock, so that the sampling circuit can collect data in each detection period according to the specified phase. The present invention provides a reasonable method to reduce the working frequency of detection and the amount of sampled data to be the same as the input signal of the APD circuit, and statistically calculate the sampling phase and decision threshold according to the dark count probability and detection efficiency required by the detection. best choice.

Description

technical field [0001] The invention relates to a single-photon detection technology, in particular to a single-photon detector using an avalanche photodiode (APD), in particular to a single-point sampling decision single-photon detector and a sampling decision method thereof. Background technique [0002] Currently, a known single-photon detector using an avalanche photodiode consists of an APD circuit and a comparison and discrimination circuit. The APD works in Geiger mode driven by gated pulses, detects input photons, and outputs photogenerated currents. The comparison and discrimination circuit detects whether the current exceeds the set threshold, and determines whether the single-photon detector detects photons accordingly. Most of the methods process and judge the output signal of APD in the analog domain [Development of Infrared Single Photon Detector, Liu Yun, Doctoral Dissertation of University of Science and Technology of China]. The patent [201310476538.5] pro...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing sampling single photon detection method requires multiple sampling of the signal in each detection cycle, resulting in the operating frequency of the detection and the amount of data obtained by sampling will be tens of times or even hundreds of times that of the input of the APD circuit times, a single-point sampling judgment single photon detector and its sampling judgment method are proposed

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