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An incoherent telescopic digital holographic imaging method and supporting device

A technology of digital holography and imaging methods, applied in the direction of instruments, etc., can solve the problems that restrict the industrialization and commercial application of incoherent telescopic digital holography technology, the reconstruction distance of object reproduction images is too large, and the experimental parameters are not coordinated, etc., and achieve simple structure , small amount of data, and low environmental requirements

Inactive Publication Date: 2017-07-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, incoherent self-interference color digital holography still has a series of problems such as inconsistency of experimental parameters, large reconstruction distance of object reconstruction image, and weak signal strength.
These problems have greatly restricted the industrialization and commercial application of incoherent telescopic digital holography in satellite imaging, astronomical imaging, and engineering inspection.

Method used

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  • An incoherent telescopic digital holographic imaging method and supporting device
  • An incoherent telescopic digital holographic imaging method and supporting device
  • An incoherent telescopic digital holographic imaging method and supporting device

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Experimental program
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Embodiment 1

[0023] An incoherent telescopic digital holographic imaging method, the light transmitted or reflected by the target object is output as a parallel beam through a converging / collimating system, and the parallel beam is further processed sequentially by a polarizer, an interference filter and a phase-type spatial light modulator The obtained hologram is received by the image sensor, and the image sensor outputs the signal to the central processing unit, and the central processing unit reconstructs the image of the target object through phase shift technology and diffraction reproduction algorithm.

[0024] Two spherical waves with different radii are loaded on the phase-type spatial light modulator.

[0025] The phase shift technology is a three-step phase shift technology, and its phase shift amounts are 0, π / 2, π respectively; the mathematical expression of its phase shift algorithm is H = [I 0 -I π +j(2I π / 2 -I 0 -I π )] / 4, where H is a synthetic hologram; I 0 , I π / 2 ...

Embodiment 2

[0027] The device supporting the incoherent telescopic digital holographic imaging method described in embodiment 1, such as figure 1 As shown, it includes a converging / collimating system, a polarizer 7, an interference filter 8, a phase-type spatial light modulator 9, and an image sensor 10 that are sequentially arranged on the optical path, and the output terminal of the image sensor 10 is connected to the input of the central processing unit. end connected.

[0028] Converging / collimating system comprises converging lens 3 and collimating lens 4 that are coaxially arranged, and converging lens 3 is closer to target object 2 than collimating lens 4, and the image formed by converging lens 3 for target object 2 is positioned at collimating lens 4 front focal plane.

[0029] The optical path process is: the incident light emitted by the white light source 1 irradiates the target object 2, and the transmitted or reflected light waves from the target object 2 are converged by t...

Embodiment 3

[0033] The device supporting the incoherent telescopic digital holographic imaging method described in embodiment 1, such as figure 2As shown, this device differs from Embodiment 2 in that: the converging convex lens 3 is replaced by a concave mirror 5 with a central opening, and the collimating convex lens 4 is replaced by a collimating mirror 6, and the collimating mirror 6 is located in the central opening The front end of the concave reflector 5, the setting position of the collimating reflector is closer to the target object than the concave reflector, and the image formed by the concave reflector in the central opening is located on the focal plane of the collimating reflector.

[0034] The incident light emitted by the white light source 1 irradiates the target object 2, and the transmitted or reflected light waves of the target object 2 are converged by the concave mirror 5 with a central opening, collimated by the collimating mirror 6, and then pass through the polari...

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Abstract

An incoherent telescopic digital holographic imaging method belongs to the field of incoherent holographic three-dimensional imaging technology. The light transmitted or reflected by a target object is output as a parallel beam through a converging / collimating system, and the parallel beam is further passed through a polarizer and an interference filter. The hologram obtained after sequential processing with the phase-type spatial light modulator is received by the image sensor, and the image sensor outputs the signal to the central processing unit, and the central processing unit reconstructs the image of the target object through phase shift technology and diffraction reproduction algorithm. The invention has the characteristics of simple structure, small amount of data, fast imaging speed, and low environmental requirements of the imaging system, and is suitable for the industrialization and commercial application of holographic technology, and has high application in macroscopic fields such as military affairs, remote sensing satellites, astronomy, and engineering detection. value.

Description

technical field [0001] The invention belongs to the technical field of incoherent holographic three-dimensional imaging, and particularly discloses an incoherent telescopic digital holographic imaging method and a supporting device. Background technique [0002] Holographic imaging uses the principle of interference to record the amplitude and phase information of the object light wave into the hologram in the form of interference fringes, and reconstructs a three-dimensional image containing the depth information of the object through the diffraction effect. Traditional holography uses laser light as the light source, resulting in a high dependence on the coherence of the light source and system stability, which greatly limits the application of holographic technology. Digital holography uses image sensors (CCD / CMOS) to record, and reconstructs the three-dimensional image of the object in the computer through data processing. Although the structure is simple, the informatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/12G03H1/22G03H1/06
Inventor 梁二军赵楠楠陈宝鑫王玲田勇志马凤英
Owner ZHENGZHOU UNIV
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