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Sampling Single Photon Detector and Its Adaptive Differential Decision Method

A single photon detector, adaptive difference technology, applied in the field of single photon detection

Active Publication Date: 2016-03-09
PLA UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing circuit fails to process the original APD digital signal reasonably, and to adjust the DC level drift of the signal adaptively, and propose a sampling single photon detector and its adaptive differential judgment method

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  • Sampling Single Photon Detector and Its Adaptive Differential Decision Method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] Such as figure 1 Shown, a kind of sampling single photon detector, it comprises APD circuit, it is characterized in that sampling circuit and digital signal processing circuit are serially connected in sequence at the signal output end of APD circuit, and described sampling circuit converts the analog signal output by APD circuit It is a digital signal, the digital signal output terminal of the aforementioned sampling circuit is connected with the signal input terminal of the digital signal processing circuit, and the digital signal processing circuit is bidirectionally connected with the storage circuit.

[0034] A kind of self-adaptive differential judgment method of sampling single photon detector, application sampling single photon detector, it comprises the following steps:

[0035] Use APD circuit to detect input photons and output photoge...

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Abstract

The invention relates to a sampling single-photon detector and a self-adaptive differential judgment method thereof. The sampling single-photon detector comprises an APD (avalanche photodiode) circuit, the signal output end of the APD circuit is sequentially connected in series with a sampling circuit and a digital signal processing circuit, and the connection between the digital signal processing circuit and a memory circuit is two-way. The self-adaptive differential judgment method of the sampling single-photon detector includes the following steps: the APD circuit is adopted to detect input photons and output photo-generated current; the photo-generated current outputted by the APD circuit is sampled, and real-time data are stored in the memory circuit; in the digital signal processing circuit, self-adaptive differential processing is carried out on the current detection data and the latest detection data which is stored in the memory circuit in the absence of single photon input, and a processing result is then compared with a judgment threshold for judgment. The invention provides a reasonable method to reasonably process original APD digital signals and carry out self-adaptive adjustment on the direct-current level shifts of signals.

Description

technical field [0001] The invention relates to a single photon detection technology, especially a single photon detector using an avalanche photodiode (APD), specifically a sampling single photon detector and an adaptive differential judgment method thereof. Background technique [0002] Currently, a known single photon detector using an avalanche photodiode is composed of an APD circuit and a comparison and discrimination circuit. The APD works in the Geiger mode driven by the gate pulse, detects the input photons, and outputs the photogenerated current. The comparison discrimination circuit detects whether the current exceeds the set threshold, and judges whether the single photon detector detects photons accordingly. In order to suppress the spike noise of the gating pulse on the APD output, methods such as differential circuits, coaxial cable reflections, and synchronous gates can usually be used [Development of Infrared Single Photon Detectors, Liu Yun, PhD thesis of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J11/00
Inventor 周华朱勇武欣嵘苏洋何敏王艺敏
Owner PLA UNIV OF SCI & TECH
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