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Single-photon distance measurement method based on polarization modulation

A technology of polarization modulation and ranging method, which is applied in the field of single photon detection and can solve the problem that photon modulation cannot be directly realized.

Active Publication Date: 2021-05-28
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is based on the polarization interference theory of light beams, and can only perform polarization modulation on signal beams with strong light intensity. When the signal light is weakened to the single-photon level, this method cannot directly realize the modulation of photons.

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  • Single-photon distance measurement method based on polarization modulation
  • Single-photon distance measurement method based on polarization modulation
  • Single-photon distance measurement method based on polarization modulation

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Embodiment Construction

[0063] Photon ranging based on polarization modulation transforms the polarization modulation of the beam in the traditional method into the regulation of the polarization state of the photon, and uses a photon counter to detect the number of echo photons after polarization modulation. By establishing the relationship between the theoretical count rate of photons and the flight time of photons, the three-dimensional distance measurement under the condition of weak light signals can be realized. How to regulate the polarization state of photons, calculate the modulation amount of the photon polarization state through the actual photon count value, and how to calculate the photon flight time from the modulation amount of the photon polarization state are the key issues of photon ranging based on polarization modulation.

[0064] The present invention mainly aims at the application requirements of target distance detection under extremely weak optical signals, and proposes a singl...

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Abstract

The invention belongs to the technical field of single-photon detection, and discloses a single-photon distance measurement method based on polarization modulation, which analyzes the polarization characteristics of photons by using the quantum theory, and establishes a relation between the flight time of the photons and the polarization modulation state of echo photons. And the flight time of the photons is calculated by detecting the transmittance of the photons to the linear polaroid, so that the target distance is measured. According to the invention, target distance measurement under the condition of weak optical signals can be realized, a timing circuit is not needed, hardware required to be integrated in three-dimensional photon counting imaging is simplified to a great extent, and convenience is provided for three-dimensional photon counting imaging with high spatial resolution.

Description

technical field [0001] The invention belongs to the technical field of single photon detection, and more specifically relates to a single photon ranging method based on polarization modulation. Background technique [0002] Compared with traditional optical detection, single-photon detection technology can be applied to the detection and analysis of weak light signals, and has been applied in the fields of microscopic imaging, fluorescence detection, biomedicine and remote sensing measurement. [0003] In the traditional three-dimensional photon counting imaging technology, the photon counter based on the Geiger mode avalanche photodiode (Gm-APD) is the most commonly used detection device, which can detect the signal of photon level reflected by the target. technology plays an important role. In order to obtain the flight time of photons and calculate the distance of the target, the photon counter needs to add a timing circuit (TDC) for time resolution. However, the TDC ha...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/36
CPCG01S17/36
Inventor 田昕刘芮何访李松
Owner WUHAN UNIV