CN-121995399-A - Single-pixel imaging method and system based on array light source coherent combination vortex light field

CN121995399ACN 121995399 ACN121995399 ACN 121995399ACN-121995399-A

Abstract

The invention provides a single-pixel imaging method and a system based on coherent synthesis of a vortex light field of an array light source, wherein single-path laser is amplified after passing through a collimation beam expander, and then is emitted and output after passing through a circular arrangement mask plate to form the array light source; the method comprises the steps of loading specific phases to different sub-apertures of an array light source through a space light phase modulator to achieve light field modulation, performing far-field coherent synthesis to obtain a vortex light field with specific intensity distribution, recording return light intensity detection values through a single-pixel detector after the vortex light field is irradiated to a target object, and obtaining a target object image based on the vortex light field intensity distribution and the return light intensity detection values and combining a single-pixel imaging reconstruction algorithm. Compared with the prior art, the method has the advantages of high sampling speed, high imaging quality, good noise robustness and the like, and is expected to be widely applied to the field of long-distance target detection imaging.

Inventors

HAN KAI
LEI GUOZHONG
LAI WENCHANG
Jia haolong
CUI WENDA
XU JIAMING
LIU JINGQI
MA YANXING
SU RONGTAO

Assignees

中国人民解放军国防科技大学

Dates

Publication Date: 20260508
Application Date: 20260409

Claims (9)

1. A single-pixel imaging system based on coherent combination of vortex light fields by an array light source, comprising: the array light source generation module is used for emitting array light beams which are distributed in a circular ring shape by multiple paths of sub-light beams; The phase modulation module is arranged on an emergent light path of the array light source generation module and is used for carrying out phase modulation on each sub-beam of the array light beam so as to generate a vortex light field; The converging lens is arranged on an emergent light path of the phase modulation module and used for projecting the vortex light field to a target object, and the target object is positioned at the focal plane position of the converging lens; a collecting lens disposed on a transmission light path of the target object for collecting transmission light from the target object; The single-pixel detector is arranged at the focal plane position of the collecting lens and is used for receiving the transmitted light converged by the collecting lens and outputting a return light intensity detection value; the data acquisition card is electrically connected with the single-pixel detector and is used for converting the return light intensity detection value into an electric signal; The computer is in communication with the data acquisition card, receives the electric signals, and reconstructs an image of the target object based on the intensity distribution of the vortex light field and the return light intensity detection value and by combining a single-pixel imaging reconstruction algorithm.
2. The single pixel imaging system based on coherent combination of swirled light fields by an array light source according to claim 1, wherein the array light source generating module comprises a laser and a beam splitting element.
3. The single-pixel imaging system based on the coherent combination of the array light sources and the vortex light field according to claim 1, wherein the array light source generating module comprises a laser, a collimation and beam expansion system and a circular mask, the collimation and beam expansion system collimates and expands light emitted by the laser, and the circular mask divides the collimation and beam expansion light output by the collimation and beam expansion system into multiple sub-beams to form an array light beam.
4. A single pixel imaging system based on coherent combination of vortex light fields by array light sources according to claim 1 or 2 or 3, wherein the phase modulation module is a liquid crystal spatial light phase modulator.
5. A single-pixel imaging method based on array light source coherent combination vortex light field, which is characterized in that the single-pixel imaging system based on array light source coherent combination vortex light field as set forth in claim 1 is realized, comprising the following steps: The array light source generating module is used for collimating and outputting array light beams, and the phase modulating module is used for modulating M times of preset ladder-type phases of all sub light beams; the array light beams are subjected to coherent synthesis at the focal plane position of the array light beams through a converging lens to generate vortex light fields and irradiate the vortex light fields on a target object, so that M frames of vortex light fields with different intensity distributions are generated altogether; M return light intensity detection values are converted into voltage signals through a data acquisition card and transmitted to a computer; the computer reconstructs an image of the target object based on the intensity distribution of the M-frame vortex light field and the corresponding M return light intensity detection values by combining a single-pixel imaging reconstruction algorithm.
6. The method for single-pixel imaging based on coherent combination of vortex light fields by array light sources according to claim 5, wherein the array light beams comprise from inside to outside Sub-rings are respectively a1 st sub-ring and a2 nd sub-ring The sub-circular ring is provided with a plurality of sub-circular rings, 。
7. The method of single pixel imaging based on coherent combination of vortex light fields by array light sources of claim 6, wherein for the first of the array light beams A sub-ring with Sub-beam, the first The first sub-ring The phase of the sub-beam is , wherein, I represents a fractional order coefficient, and the phase difference of adjacent unit beams is 。
8. The single-pixel imaging method based on coherent combination of vortex light fields by array light sources according to claim 5, 6 or 7, wherein reconstructing an image of a target object based on the intensity distribution of M frames of vortex light fields and corresponding M return light intensity detection values in combination with a single-pixel imaging reconstruction algorithm comprises: (1) The mth return light intensity detection value is expressed as: Wherein the method comprises the steps of Represents the mth return light intensity detection value, A two-dimensional image representing the target object, Representing the intensity distribution of the m-th frame vortex light field, wherein </DEG > represents the inner product; (2) Constructing an optimization model of a compressive sensing algorithm based on total variation: wherein c represents the gradient of the target object, Representing the gradient computation matrix, L 1 norm for calculating total variation of target object, M return light intensity detection values form vector Intensity distribution constitution vector of M-frame vortex light field Straightening the two-dimensional image of the target object into a fixed scanning sequence Column vector of dimension , Is the total pixel number; (3) Optimally solving the optimization model, and reconstructing an image of the target object 。
9. The method of claim 8, wherein in step (3), an augmented lagrangian multiplier method is introduced, an optimization model is optimized under the framework of gradient descent to solve for L 1 norm minimization, and an optimal solution, i.e. an image of a final reconstructed target object, is derived by adjusting lagrangian multipliers and balance parameters in the augmented lagrangian multiplier method 。

Description

Single-pixel imaging method and system based on array light source coherent combination vortex light field Technical Field The invention relates to the technical field of target detection imaging, in particular to a single-pixel imaging method and system based on coherent combination of array light sources and vortex light fields. Background The object detection imaging technology is an important means for human perception and understanding of the world, and plays an important role in technological and social development. Shan Xiangsu imaging is a novel computational imaging technology, the basic principle is that laser is modulated to generate a light field with specific spatial intensity distribution and irradiates on a target, return light intensity passing through the target is received by a single-pixel detector and synchronously recorded on a computer through an acquisition card, and finally a reconstruction algorithm is adopted to obtain an object image. The detector is mainly made of germanium, silicon and other materials, has the advantages of wide response wave band, high detection sensitivity and concentrated detection energy, and has a wide application prospect in the fields of non-visible light wave band imaging, weak light detection, long-distance target detection and the like. However, the current technology still has the problems of insufficient detection distance and lower detection efficiency in the process of falling to the ground to practical application. Disclosure of Invention Aiming at the problems of low imaging efficiency, short detection distance and easy environmental influence in the technical field of single-pixel imaging at present, the invention provides a single-pixel imaging method and a single-pixel imaging system based on coherent combination of array light sources and vortex light fields. The invention combines the coherent combination vortex light field technology with the single-pixel imaging technology, on one hand, the invention is based on the array light source coherent combination technology to realize high output power and improve the target detection distance, and on the other hand, the invention is based on the special distribution of the vortex light field and combines the basic principle of single-pixel imaging to improve the imaging quality and the imaging efficiency. In order to achieve the technical purpose, the invention adopts the following technical scheme: In one aspect, a single-pixel imaging system based on coherent combination of array light sources with a vortex light field is provided, comprising: the array light source generation module is used for emitting array light beams which are distributed in a circular ring shape by multiple paths of sub-light beams; The phase modulation module is arranged on an emergent light path of the array light source generation module and is used for carrying out phase modulation on each sub-beam of the array light beam so as to generate a vortex light field; The converging lens is arranged on an emergent light path of the phase modulation module and used for projecting the vortex light field to a target object, and the target object is positioned at the focal plane position of the converging lens; a collecting lens disposed on a transmission light path of the target object for collecting transmission light from the target object; The single-pixel detector is arranged at the focal plane position of the collecting lens and is used for receiving the transmitted light converged by the collecting lens and outputting a return light intensity detection value; the data acquisition card is electrically connected with the single-pixel detector and is used for converting the return light intensity detection value into an electric signal; The computer is in communication with the data acquisition card, receives the electric signals, and reconstructs an image of the target object based on the intensity distribution of the vortex light field and the return light intensity detection value and by combining a single-pixel imaging reconstruction algorithm. On the other hand, a single-pixel imaging method based on array light source coherent combination vortex light field is provided, which is realized based on the system and comprises the following steps: The array light source generating module is used for collimating and outputting array light beams, and the phase modulating module is used for modulating M times of preset ladder-type phases of all sub light beams; the array light beams are subjected to coherent synthesis at the focal plane position of the array light beams through a converging lens to generate vortex light fields and irradiate the vortex light fields on a target object to generate M frames of vortex light fields with different intensity distribution altogether; M return light intensity detection values are converted into voltage signals through a data acquisition card and transmitted to a computer; the computer re