Compressed sensing imaging device and method based on entangled two-photon signal

A technology of compressed sensing and imaging device, applied in the field of quantum imaging, can solve the problems of large difference in recovery effect, limited resolution, easy to be disturbed by the environment, etc., and achieve the effect of reducing the amount of data, improving the imaging quality and the recovery effect.

Active Publication Date: 2018-11-20
XIDIAN UNIV
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  • Application Information

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Problems solved by technology

[0002] In traditional optical imaging, there are mainly the following three defects: 1) Imaging requires a surface detector to receive the two-dimensional information of the image; 2) The resolution of imaging is limited by the optical diffraction limit; 3) The imaging process is easily affected by the environment Interference, resulting in lower accuracy of imaging results
[0004] At present, for the application of compressed sensing theory in quantum imaging, the generally selected observation matrix is ​​a series of random matrices. Although these matrices can meet the simulation requirements, they are not easy to store in the actual application process, and the use of random matrices will also lead to multiple The recovery effect of the experiment is quite different, and the recovery effect is not good when the number of samples is small

Method used

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Embodiment 1

[0033] At present, the observation matrix used in quantum imaging experiments is generally a Gaussian random matrix. Each element in this matrix is ​​independently subject to a Gaussian distribution, so obtaining a Gaussian matrix requires a large amount of memory and in the case of low sampling rates. Image quality is poor. The purity of entangled light prepared in existing quantum imaging experimental devices is not very high, which will directly affect the quality of imaging. In response to these problems, the present invention proposes a compressed sensing imaging device based on entangled two-photon signals, see attached figure 1After being reflected by the plane mirror 2, the laser light emitted from the laser 1 is firstly adjusted by the beam and filtered out the stray light optical path, and then hits the BBO crystal 9 to generate entangled two-photon pairs whose polarization directions are perpendicular to each other. The two-photon pairs are entangled through the foc...

Embodiment 2

[0036] The overall composition of the compressed sensing imaging device based on entangled two-photon signals is the same as in Embodiment 1, see the attached figure 1 , in the present invention, the signal beam hits the target object 15 through the imaging lens 14, and the imaging lens 14 satisfies the Gaussian imaging formula 1 / d s +1 / d i =1 / f, d in the formula s Indicates the object distance, d i represents the image distance, and f represents the focal length of the imaging lens; because the imaging optical path is divided into two paths, the BBO crystal 9 can be regarded as a reflector, so the general imaging frame can be obtained again; d s Specifically refers to the distance from the object to the imaging lens 14, and d i It should be the sum of the distance between the imaging plane and the BBO crystal 9 plus the distance from the BBO crystal 9 to the imaging lens 14; after the light beam passes through the BBO crystal 9, the light spot is too large, so the present ...

Embodiment 3

[0041] The overall composition of the compressed sensing imaging device based on entangled two-photon signals is the same as that of Embodiment 1-2. In the present invention, the laser is firstly adjusted by the beam and filtered out stray light, wherein the optical path of beam adjustment and filtered out stray light is composed of two convex lenses The telescope system and the 0-degree incident thermal mirror and low-pass narrow-band filter placed in sequence along the laser transmission direction between the telescope systems are realized. Such as figure 1 , the 460nm laser beam coming out of the laser 1 contains a small amount of 920nm stray light and the inevitable background light in the surrounding environment, which will affect the preparation of entangled two-photons and thus affect the subsequent imaging results. The present invention adopts beam adjustment And filter the stray light optical path to process the beam: figure 1 3 and 7 are two convex lenses respective...

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Abstract

The invention discloses a compressed sensing imaging device and method based on an entangled two-photon signal, and solves the problem of not high imaging quality under the condition of low sampling number. According to the method, a deterministic determinacy random matrix is loaded in a spatial light modulator of an original quantum imaging device to complete imaging of a target object; and during preparation of entangled light, a telescoping system and a 0-degree incident heat mirror and a low-pass narrow-band filter which are placed along a laser transmission direction among the telescopingsystem are adopted to process laser. The imaging method includes producing a picture for being input to a spatial light modulator; inputting the picture to the spatial light modulator; preparing entangled light; obtaining a matched result value; loading a plurality of sets of modulated observation matrices and obtaining M matched results; constructing a quantum imaging mathematical model; and adopting a compressed sensing algorithm to solve a quantum imaging relational expression to restore an image of the target object. The entangled light prepared by the compressed sensing imaging device and method provided by the invention is high in purity and can well restore the image of the target object under the condition of a low sampling rate.

Description

technical field [0001] The invention belongs to the technical field of quantum imaging, and in particular relates to quantum imaging under the theoretical framework of compressed sensing. Specifically, it is a compressed sensing imaging device and method based on entangled two-photon signals. for quantum imaging. Background technique [0002] In traditional optical imaging, there are mainly the following three defects: 1) Imaging requires a surface detector to receive the two-dimensional information of the image; 2) The resolution of imaging is limited by the optical diffraction limit; 3) The imaging process is easily affected by the environment interference, resulting in lower accuracy of imaging results. Although many new ideas and methods have been proposed to improve these problems, the benefits obtained are limited. The emergence of quantum imaging has great advantages in dealing with the above problems: 1) Quantum imaging does not require planar detectors, it only n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G02B27/28G06T5/00
CPCG01B11/00G02B27/283G06T5/001
Inventor 李军钱佳川张大命刘志刚高文钰
Owner XIDIAN UNIV
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