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A single-photon ranging 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: 2022-07-05
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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  • A single-photon ranging method based on polarization modulation
  • A single-photon ranging method based on polarization modulation
  • A single-photon ranging method based on polarization modulation

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Embodiment Construction

[0063] The photon ranging based on polarization modulation converts the polarization modulation of the beam in the traditional method into the control of the polarization state of the photons, 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 time-of-flight of photons, three-dimensional distance measurement in the case of weak optical signals can be realized. How to control the polarization state of photons, and calculate the control amount of the photon polarization state from the actual count value of the photon, and how to calculate the photon flight time from the control amount of the photon polarization state, are the key issues of photon ranging based on polarization modulation.

[0064] The invention mainly aims at the application requirements of target distance detection under extremely weak light signals, and according to the polarization m...

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Abstract

The invention belongs to the technical field of single-photon detection, and discloses a single-photon ranging method based on polarization modulation, which uses quantum theory to analyze the polarization characteristics of photons, and establishes a relationship between the flight time of photons and the polarization modulation state of echo photons. Contact, by detecting the transmittance of photons to the linear polarizer, the flight time of photons is calculated, so as to realize the distance measurement of the target. The present invention can realize target distance measurement under weak light signal condition without timing circuit, greatly simplifies the hardware required to be integrated in three-dimensional photon counting imaging, and provides convenience 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 particularly, 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] Among the traditional 3D photon counting imaging techniques, photon counters based on Geiger mode avalanche photodiodes (Gm-APDs) are the most commonly used detection devices, which can detect the photon-level signal reflected by the target, which can be used in photon counting measurements. 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 tim...

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Application Information

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