Scanning photon counting non-visual-field three-dimensional imaging device and method

A technology of photon counting and three-dimensional imaging, which is applied in the field of non-line-of-sight three-dimensional imaging technology, can solve problems such as inability to image non-line-of-sight scenes, and achieve the effect of improving flexibility

Inactive Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing technology cannot image the non-l...

Method used

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  • Scanning photon counting non-visual-field three-dimensional imaging device and method
  • Scanning photon counting non-visual-field three-dimensional imaging device and method
  • Scanning photon counting non-visual-field three-dimensional imaging device and method

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specific Embodiment approach 1

[0042] Specific implementation mode one: combine figure 2 and image 3 Describe this embodiment in detail. A scanning photon counting non-view-field three-dimensional imaging device described in this embodiment includes a pulsed laser 1, a beam shaping system 2, a receiving optical system 3, a single-photon detector 5, and a time-correlated single-photon Counter 6, computer 7;

[0043] The pulsed laser 1 emits laser light and sends a time signal to the time-correlated single photon counter 6. The laser emitted by the pulsed laser 1 is shaped by the beam shaping system 2 and then incident on the wall. The laser scattered by the wall is reflected by the target and then incident on the wall again. The receiving optical system 3 receives the laser light returned by the wall, the laser is incident on the single photon detector 5, the output end of the single photon detector 5 is connected to the input end of the time-correlated single photon counter 6, and the output end of the t...

specific Embodiment approach 2

[0046] Embodiment 2: Based on the imaging method of a non-scanning photon counting non-sight three-dimensional imaging device described in Embodiment 1, the method includes the following steps:

[0047] The pulse laser 1 emits laser light and gives a time signal to the time-correlated single photon counter 6;

[0048] Using a beam shaping system 2 to shape the laser light emitted by the pulse laser 1;

[0049] The shaped laser is incident on the wall, and the laser scattered by the wall is reflected by the target and then incident on the wall again;

[0050] The receiving optical system 3 receives the laser light returned by the wall, and makes the image square field of view of the receiving optical system 3 the same as the field of view of the single photon detector 5;

[0051] The time-correlated single photon counter 6 calculates the photon flight time of the photon incident to the single photon detector 5 from the pulse laser 1 to the photon flight time returning to the s...

specific Embodiment approach 3

[0055] Specific implementation mode three: combination Figure 4Describe this embodiment in detail. This embodiment is a further description of the scanning photon counting non-view-field three-dimensional imaging method described in the second embodiment. In this embodiment,

[0056] The computer 7 reconstructs the three-dimensional image of the target according to multiple time photon counting images to obtain the three-dimensional image, which specifically includes the following steps:

[0057] Back projection:

[0058] To establish a model, pulse laser 1 is located at point L, single photon detector 5 is located at point D, and the point where the laser emitted by pulse laser 1 is incident on the wall is the source point, S j The jth source point, the single photon detector 5 corresponds to a point on the wall, which is the image point, I i is the i-th image point;

[0059] Back-project each time photon map into three-dimensional space, and the value of each moment in t...

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Abstract

The invention provides a scanning photon counting non-visual-field three-dimensional imaging device and method, relating to the technology of laser imaging. The invention aims to solve a problem that a non-visual-field scene can not be imaged in the prior art. A pulse laser emits laser and gives a time signal to a time correlated single photon counter. Shaped laser is emitted to a wall body, and the laser scatted by the wall body is reflected by a target and then is emitted to the wall body again. A receiving optical system receives the laser returned by the wall body, and the image side visual field of the receiving optical system is same with the visual field of a single photon detector. The time correlated single photon counter calculates photon flight time and obtains a time photon counting diagram. A pulse laser and a single photon detector carry out scanning continuously, and multiple time photon counting diagrams are obtained. A computer reconstructs the 3D image of the target according to the multiple time photon counting diagrams, and a 3D image is obtained. The scanning photon counting non-visual-field three-dimensional imaging device and method are suitable for the three-dimensional imaging of a non-visual-field target.

Description

technical field [0001] The invention relates to a laser imaging technology, in particular to a non-visual three-dimensional imaging technology. Background technique [0002] Laser imaging technology has the advantages of high lateral resolution, small ranging error, fast imaging speed, and small volume and weight, so it is widely used in civilian and military fields to directly obtain the intensity information and three-dimensional distance information of the target. Realize the identification of the target. With the development of device technology, especially the emergence of high-sensitivity, high-time-resolution single-photon detectors, laser imaging technology is not limited to the detection of conventional targets, but has also been applied to the detection of targets under special conditions or special environments. Detection and recognition, especially the imaging of objects in non-line-of-sight scenes, is gaining more and more attention. [0003] The so-called non...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01V8/12
CPCG01S17/89G01V8/12
Inventor 靳辰飞张思琦赵远谢佳衡刘丽萍张勇张子静李家欢
Owner HARBIN INST OF TECH
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