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Single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and single photon distance measurement device

A technology of orbital angular momentum and background noise, which is applied in the field of laser detection, can solve the problem that the background noise of single photon detection cannot be well eliminated, and achieve the effect of improving sensitivity, detection distance and good real-time performance

Inactive Publication Date: 2017-07-14
HARBIN INST OF TECH
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  • Abstract
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing methods cannot well eliminate the background noise in single-photon detection, and propose a single-photon ranging background noise filtering method based on photon orbital angular momentum modulation and a single-photon ranging device

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  • Single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and single photon distance measurement device
  • Single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and single photon distance measurement device
  • Single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and single photon distance measurement device

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specific Embodiment approach 1

[0018] Specific implementation mode one: combine Figure 1 to Figure 3 To illustrate this embodiment, a single-photon ranging background noise filtering method based on photon orbital angular momentum modulation described in this embodiment is:

[0019] Modulate the orbital angular momentum of the transmitted signal to order m, m>>1;

[0020] Perform -m order inverse modulation on the orbital angular momentum of the received signal;

[0021] The background noise in the inversely modulated received signal is filtered out by using an aperture diaphragm.

[0022] The light field expression of general monochromatic light:

[0023] E=E 0 exp(-ikz) (1)

[0024] In the formula, E 0 is the amplitude, k is the wave number, and z is the propagation distance.

[0025] For an orbital angular momentum beam with topological charge value l, the light field expression is:

[0026] E=E 0 exp(-ikz)exp(imθ) (2)

[0027] Comparing formula (1) and formula (2), it can be clearly seen that ...

specific Embodiment approach 2

[0033] Specific implementation mode two: this implementation mode is a further limitation of the single-photon ranging background noise filtering method based on photon orbital angular momentum modulation described in the first implementation mode. In this embodiment mode, the spiral phase plate 4 is used to transmit The orbital angular momentum of the signal is modulated to order m.

specific Embodiment approach 3

[0034] Specific implementation mode three: combination Figure 4 Describe this embodiment, a kind of single-photon ranging device based on photon orbital angular momentum modulation described in this embodiment includes synchronous control module (1), pulse laser (2), 4F optical system (3), spiral phase plate ( 4), transmitting optical system (5), receiving optical system (6), reflective spatial light modulator (7), total reflection mirror (8), aperture diaphragm (9), single photon detector (10), timing Circuit (11) and signal processing module (12);

[0035] The synchronous control module (1) is used to generate two identical signals, one is used to drive the pulse laser (2) to emit laser pulse signals, and the other is input to the timing circuit (11) as a timing start signal;

[0036] The laser pulse signal emitted by the pulse laser (2) passes through the 4F optical system (3) and the spiral phase plate (4) in sequence, and then is emitted through the emission optical sys...

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Abstract

The present invention provides a single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and a single photon distance measurement device, and relates to the laser detection technology field. The objective of the invention is to solve the problem that the background noise in the single photon detection cannot be greatly eliminated in the prior art. A spiral phase plate is employed at an emission end to modulate the orbital angular momentum of emission signals to m order, wherein m>>1; and performing -m inverse modulation of the orbital angular momentum of receiving signals at a receiving end, and employing an aperture diaphragm to filter the background noise in the receiving signals after the inverse modulation. The single photon distance measurement background noise filtering method based on photon orbital angular momentum modulation and the single photon distance measurement device employ high-order orbital angular momentum signal photon signals which are not existed in the natural world to perform high-order orbital angular momentum modulation of the emission laser pulse signals so as to effectively distinguish signals and background noise, realize complete filtering of the noise, remove the interference of the background noise, effectively improve the sensitivity and the detection distance and realize megameter detection distance. The timeliness is good.

Description

technical field [0001] The invention relates to the technical field of laser detection. Background technique [0002] With the development of science and technology and the needs of various application backgrounds, the requirements for the detection distance of laser ranging are getting higher and higher. Throughout the development history of laser ranging, the photoelectric detection system was mainly based on PIN and CCD detection at the beginning, and its response sensitivity was 10 -7 Around W, as the requirements for detection distance and detection sensitivity in the application field are getting higher and higher, APD and ICCD detectors with higher sensitivity gradually appear, and their sensitivity is generally 10 -8 W or so. These traditional detectors are still intensity detectors, and they can distinguish noise according to the peak amplitude of the signal, but with the further pursuit of sensitivity, single-photon detectors such as Gm-APD have appeared, which a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/48
CPCG01S7/4802
Inventor 张子静赵远岑龙柱张建东李硕
Owner HARBIN INST OF TECH
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