CN212647175U - A device for measuring super-resolution ghost imaging quality with drifting beams - Google Patents
A device for measuring super-resolution ghost imaging quality with drifting beams Download PDFInfo
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- 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
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Abstract
本实用新型公开了一种漂移光束计量超分辨鬼成像质量的装置。实施步骤是：用计算机制备一组全息相图序列并加载至空间光调制器以恒定速度播放；激光器照射空间光调制器，经孔径光阑选取其一级衍射级后照射CCD相机靶面；CCD相机以一定频率对入射光束进行拍摄并保存；待成像物体以数字矩阵形式加载在CCD相机靶面阵列中；利用该数字图像矩阵与所拍摄多帧光强数据矩阵进行运算并可重构出物体的形状并对分辨率定量分析；改变全息相图序列中的拓扑荷，重复上述步骤，直至最佳效果。本实用新型所提供的装置光路简单，操控方便，抗干扰能力强，成像效率高，可产生关联结构可控的部分相干光，产生的漂移光束可以在湍流环境下对标定物超分辨成像。
The utility model discloses a device for measuring the imaging quality of super-resolution ghosts with drift beams. The implementation steps are: prepare a set of holographic phase image sequences by computer and load them into the spatial light modulator to play at a constant speed; the laser irradiates the spatial light modulator, selects its first-order diffraction order through the aperture diaphragm, and then illuminates the CCD camera target surface; The camera shoots and saves the incident beam at a certain frequency; the object to be imaged is loaded into the CCD camera target array in the form of a digital matrix; the digital image matrix is used to perform operations with the multiple frames of light intensity data matrix captured and the object can be reconstructed The shape and resolution are quantitatively analyzed; the topological charge in the holographic phase diagram sequence is changed, and the above steps are repeated until the best effect. The device provided by the utility model has the advantages of simple optical path, convenient operation, strong anti-interference ability and high imaging efficiency, and can generate partially coherent light with controllable associated structure, and the generated drift beam can super-resolution imaging of calibration objects in a turbulent 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.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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| 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 |
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