CN212647175U - Device for measuring super-resolution ghost imaging quality by using drift light beam - Google Patents
Device for measuring super-resolution ghost imaging quality by using drift light beam Download PDFInfo
- Publication number
- CN212647175U CN212647175U CN202021207569.2U CN202021207569U CN212647175U CN 212647175 U CN212647175 U CN 212647175U CN 202021207569 U CN202021207569 U CN 202021207569U CN 212647175 U CN212647175 U CN 212647175U
- Authority
- CN
- China
- Prior art keywords
- resolution
- ccd camera
- light modulator
- spatial light
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 39
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 239000011159 matrix material Substances 0.000 abstract description 10
- 230000001427 coherent effect Effects 0.000 abstract description 6
- 238000010587 phase diagram Methods 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000424941 Canis lupus lupus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Landscapes
- Holo Graphy (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a device of drift beam measurement super-resolution ghost imaging quality. The implementation steps are as follows: preparing a group of hologram sequences by a computer and loading the hologram sequences to a spatial light modulator to play at a constant speed; the laser irradiates the spatial light modulator, and a first-order diffraction order of the spatial light modulator is selected through the aperture diaphragm to irradiate the target surface of the CCD camera; the CCD camera shoots and stores the incident beam at a certain frequency; loading an object to be imaged in a CCD camera target surface array in a digital matrix form; the digital image matrix and the shot multi-frame light intensity data matrix are used for operation, the shape of an object can be reconstructed, and the resolution ratio is quantitatively analyzed; and changing the topological charge in the holographic phase diagram sequence, and repeating the steps until the optimal effect is achieved. The device light path that provides is simple, controls the convenience, and the interference killing feature is strong, and the formation of image is efficient, can produce the controllable partial coherent light of associative structure, and the drift light beam of production can be to calibration object super-resolution formation of image under the torrent environment.
Description
Technical Field
The utility model provides a device of drift beam measurement super-resolution ghost imaging quality. The special partially coherent light generated by the device can break through the Rayleigh diffraction limit in a ghost imaging system, can realize super-resolution imaging measurement by taking a virtual object as a calibration object, and belongs to the field of optical imaging measurement.
Background
The resolution of an optical system refers to its ability to resolve two close point or object details. The image of the point object formed by the optical system always has an airy disk with a certain size due to the diffraction. When the distance between two point objects is too close, the images of the two point objects are partially overlapped, so that the two point objects cannot be distinguished. In long-range imaging, turbulence and environmental disturbances can cause the resolution of the imaging system to drop substantially. Turbulence is a special transmission medium and is found everywhere in reality. When a light beam is transmitted through turbulence, the intensity, phase and even propagation direction of the light beam are affected due to random uneven distribution of refractive index in the turbulence, thereby causing phenomena such as random drift, expansion and flicker of the light beam. These non-ideal environmental factors greatly undermine the imaging performance of the optical system.
Ghost imaging is an imaging technique that uses two mutually associated and mutually independent light fields (signal light field and reference light field) to perform composite detection and reconstruct the spatial information of an object to be measured. Different from the traditional imaging method which adopts the light field intensity to extract signals, ghost imaging utilizes the light intensity fluctuation information to measure, has low requirement on the space resolution of a detector, and is an important optical means for realizing turbulence and remote imaging. The imaging quality of a ghost imaging system is affected by light source correlation characteristics, object shape, material, and scattering properties. The problem that the calibration of Rayleigh diffraction degree is broken through for a ghost imaging system is not solved at present.
The ghost imaging system is an imaging device which compositely detects and reconstructs the spatial information of an object to be detected by utilizing two mutually-associated and mutually-independent light fields (a signal light field and a reference light field). Different from the traditional imaging method which adopts the light field intensity to extract signals, ghost imaging utilizes the light intensity fluctuation information to measure, has low requirement on the spatial resolution of a detector, and is beneficial to realizing turbulence and remote imaging. The imaging quality of a ghost imaging system can be affected by light source correlation characteristics, object shape, material, and scattering properties. Therefore, the measurement and calibration of the resolution of the ghost imaging system in the turbulent flow environment are important prerequisites for performing super-resolution limit analysis on the ghost imaging system.
The drift beam is a partially coherent beam formed by the laser light entering atmospheric turbulence. Ghost imaging is performed by using the light beam, and the method is a suitable choice for realizing turbulence imaging measurement in reality. The document [ G.Gbour, T.D.Visser, and E.wolf, "high' singularities in partial coherent fields," J.Opt. A6, S239 (2004) ] reports a theoretical model of the drifting beam, but does not solve the device for experimentally generating the drifting beam and the application of the drifting beam in super-resolution ghost imaging metrology.
Disclosure of Invention
The utility model discloses aim at overcoming prior art's not enough, provide a device of drift beam measurement super-resolution ghost imaging quality. The device provided by the utility model can produce the drift light beam, carries out image reconstruction to the object. The resolution of the ghost imaging system can be measured and optimized by regulating and controlling the parameters of the drifting light beams. Furthermore, the utility model provides an among the device, the light path is simple, controls the convenience, and the interference killing feature is strong, and it is efficient to form images.
Realize the technical scheme of the purpose of the utility model provides a drift beam measurement super-resolution ghost image quality's device, including following step:
(1) computer generating a special digital holographic picture; the digital hologram is capable of generating a random light field of the form:
wherein, the representation is a complete coherent vortex field with topological charge, the representation is the position coordinate of any point in space, the coordinate is a random number distributed in a light field plane by a specific probability function,
is a random phase between 0 and 2 pi; showing the superposition of a plurality of vortex fields, wherein the superposition times are;
(2) loading the holographic phase diagram sequence to a spatial light modulator and playing the holographic phase diagram sequence on a liquid crystal screen at a specific speed;
(3) the laser generates linearly polarized light matched with the spatial light modulator;
(4) the linearly polarized light beam irradiates a liquid crystal screen of the spatial light modulator, and first-order diffracted light reflected by the liquid crystal screen is selected by an aperture diaphragm;
(5) the first-order diffracted light is emitted into the target surface of the CCD camera; shooting and storing an incident beam by a CCD camera at a certain frequency, wherein the shooting speed of the CCD camera needs to be lower than the loading speed of a hologram;
(6) loading an object to be imaged in a CCD camera target surface array in a digital matrix form; the digital image matrix and the shot multi-frame light intensity data matrix are used for operation, and the spatial distribution of the object can be obtained through the HBT (Handury Brown Twiss) principle, so that the shape of the object is reconstructed, and the resolution ratio of the object is quantitatively analyzed;
(7) and adjusting the topological load, generating a new holographic phase diagram sequence, and repeating the steps of the device until the ghost resolution breaking through the Rayleigh diffraction limit is obtained.
The utility model has the advantages that:
1. the utility model provides a device of drift beam measurement super-resolution ghost imaging quality. The utility model provides a device light path is simple, controls the convenience, and the interference killing feature is strong, and it is efficient to form images.
2. The utility model provides a device of drift beam measurement super-resolution ghost imaging quality, the drift beam that the device produced can break through rayleigh diffraction limit through ghost imaging system under torrent environment, can realize using virtual object to form images as the super-resolution of calibration thing
3. The utility model provides a device of drift beam measurement super-resolution ghost imaging quality can produce the controllable partial coherent light of associative structure.
Drawings
Fig. 1 is a schematic structural diagram of an apparatus for measuring super-resolution imaging quality by using a drifting beam according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an embodiment of the present invention, in which an object to be imaged is loaded on a CCD camera target surface array in a digital matrix form.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are provided for explaining the present invention and are also a preferred application of the present invention, but the present invention is not limited to the following examples.
As shown in fig. 1, it is a schematic structural diagram of an apparatus for measuring super-resolution ghost imaging quality by using a drifting beam according to the present embodiment: it comprises a laser 1; a spatial light modulator 2; a computer 3; an aperture stop 4; a CCD camera 5;
as shown in fig. 2, it is a schematic structural diagram of an object to be imaged in the apparatus for measuring super-resolution ghost imaging quality by using a drifting beam according to the present embodiment: it comprises a CCD camera target surface array 1; an array of objects to be imaged 2.
In this embodiment, the computer 3 generates a set of hologram sequences of the superimposed state light field according to a formula, wherein each hologram is independent from each other; loading the holographic phase diagram sequence on a liquid crystal screen of the spatial light modulator 2, and playing at a specific speed; opening the laser 1 to generate stable linearly polarized light, and adjusting the polarization plane of emergent light of the laser 1 to be matched with the spatial light modulator 2; irradiating the liquid crystal screen of the spatial light modulator 2 with light beams, and selecting first-order diffracted light reflected by the liquid crystal screen by using an aperture diaphragm 4; the first-order diffracted light is emitted into the target surface of the CCD camera 5; the CCD camera 5 shoots and stores the incident beam at a certain frequency, and ensures that the shooting rate of the CCD camera is lower than the loading rate of the hologram; as shown in fig. 2, the object to be imaged is designed into a group of double holes with the same size and loaded in a CCD camera target surface array in a digital matrix form; the digital image matrix of the object to be imaged and the shot multi-frame light intensity data matrix are used for operation, and the spatial distribution of the object can be obtained through the HBT (heterojunction bipolar transistor) principle, so that the shape of the object is reconstructed, and the resolution ratio of the object is quantitatively analyzed.
In this embodiment, the topological load is adjusted to generate a new hologram sequence, and the above steps are repeated until a ghost resolution that breaks through the rayleigh diffraction limit is obtained.
Claims (3)
1. The utility model provides a device of drift beam measurement super-resolution ghost image quality comprises laser instrument (1), spatial light modulator (2), computer (3), aperture diaphragm (4), CCD camera (5), its characterized in that: the device is characterized in that the spatial light modulator (2) is arranged behind the laser (1), the computer (3) is connected with the spatial light modulator (2), the aperture diaphragm (4) is arranged behind the spatial light modulator (2), and the CCD camera (5) is connected with the computer (3).
2. The apparatus of claim 1, wherein the apparatus comprises: the playing speed of the spatial light modulator (2) is not lower than the shooting speed of the CCD camera (5).
3. The apparatus of claim 1, wherein the apparatus comprises: the imaging of the CCD camera (5) is realized by loading the object to be imaged in a digital form in the target surface array.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021207569.2U CN212647175U (en) | 2020-06-28 | 2020-06-28 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021207569.2U CN212647175U (en) | 2020-06-28 | 2020-06-28 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212647175U true CN212647175U (en) | 2021-03-02 |
Family
ID=74772725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021207569.2U Expired - Fee Related CN212647175U (en) | 2020-06-28 | 2020-06-28 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212647175U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596465A (en) * | 2020-06-28 | 2020-08-28 | 中国计量大学 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
-
2020
- 2020-06-28 CN CN202021207569.2U patent/CN212647175U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596465A (en) * | 2020-06-28 | 2020-08-28 | 中国计量大学 | Device for measuring super-resolution ghost imaging quality by using drift light beam |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109343077B (en) | Liquid crystal phased array ghost imaging system and imaging method thereof | |
| CN103201648B (en) | Calibration of a probe in ptychography | |
| CN104634699B (en) | Laguerre-gaussian beam-based speckle contrast imaging measurement device and laguerre-gaussian beam-based speckle contrast imaging measurement method | |
| CN106097269B (en) | Based on the method for calculating the micro- vision system of high-resolution of ghost imaging and obtaining image | |
| US5384573A (en) | Image synthesis using time sequential holography | |
| CN105676613B (en) | A kind of digital hologram phantom imaging system and its working method using single pixel bucket detector | |
| CN103822577A (en) | Single-pixel terahertz holographic imaging device and method | |
| CN101726366A (en) | Wavefront measurement method and device based on multiple-pinhole plate | |
| CN109031915B (en) | Method and system for obtaining multimode fiber imaging transmission matrix | |
| CN105043543A (en) | Apparatus for generating controllable super-Rayleigh speckle field and method for generating the same | |
| CN103472456A (en) | Active imaging system and method based on sparse aperture compressing calculation correlation | |
| CN109521580A (en) | Multilayer imaging device and imaging method based on vortex photon screen telescopic system | |
| CN204228121U (en) | A kind of ellipsoidal mirror surface shape detection apparatus | |
| CN111366557A (en) | Phase imaging method based on thin scattering medium | |
| CN104914702B (en) | Optical imagery concealing device and hidden method | |
| CN212647175U (en) | Device for measuring super-resolution ghost imaging quality by using drift light beam | |
| CN110673330A (en) | Imaging system depth of field expanding device and method based on scattering | |
| CN107478173B (en) | A kind of particulate samples pond and microparticle particle shape coaxial digital holography measuring device | |
| CN111307718A (en) | Method for expanding field of view based on calculation of ghost imaging penetration scattering medium | |
| CN111596465A (en) | Device for measuring super-resolution ghost imaging quality by using drift light beam | |
| CN101545976A (en) | Double-fold-line back projection imaging method for reflection chromatography laser radar | |
| CN110703276A (en) | Fourier imaging device and method under strong scattering condition | |
| CN115496653A (en) | PSF scaling-based scattering medium depth resolution imaging method | |
| CN114264370A (en) | Compressed sensing computed tomography spectrometer system and imaging method | |
| CN111352126B (en) | Single-pixel imaging method based on atmospheric scattering medium modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210302 |