Computational Ghost Imaging System and Method Based on Kohler Illumination

A technology of ghost imaging and lighting, applied in optical components, instruments, optics, etc., can solve the problems of mutual constraints between image contrast and resolution

CN110244471BActive Publication Date: 2021-07-16EAST CHINA JIAOTONG UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-07-16

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Abstract

The invention discloses a computational ghost imaging system and method based on Kohler illumination. The system includes a He-Ne laser, a beam expander, a collimator lens, a diaphragm, a polarizer, and a spatial light modulation device sequentially arranged on the optical path. device, analyzer, Kohler mirror, aperture stop, field stop, condenser lens, object to be imaged, converging lens, barrel detector, wherein, the spatial light modulator and the barrel detector are connected with computer electronics The computer is used to obtain a high-contrast image of the object to be imaged through a computational ghost imaging technique, and Koehler illumination and a Lorentz shaped incoherent light source are introduced into the computational ghost imaging process. The invention combines the Kohler illumination method and the Lorentz shaped incoherent light source, can eliminate the defect of uneven illumination on the object plane, improve the resolution ability of the computational ghost imaging system, and realize computational ghost imaging with high contrast and high resolution of the object to be imaged.
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Description

technical field

[0001] The invention relates to the technical field of computational imaging, in particular to a computational ghost imaging system and method based on Koehler illumination. Background technique

[0002] Ghost imaging, also known as correlation imaging, originated in the 1990s when physicists studied the nonlocal properties of quantum entangled photon pairs. In the process of ghost imaging, a beam of laser light is first irradiated on the rotating ground glass to generate a pseudothermal optical field with random speckle distribution characteristics; then a 5-5 beam splitter with no polarization characteristics is placed behind the pseudothermal optical field, Make it generate two beams with the same distribution characteristics, one of which is received by the barrel detector after passing through the object to be imaged, which is called the test light path; the other beam is received by the high-resolution surface detector after propagating in free space, c...

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Embodiment Construction

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] see figure 1, the computational ghost imaging system based on Koehler illumination proposed by the embodiment of the present invention includes a He-Ne laser 101, a beam expander 102, a collimator lens 103, a diaphragm 104, a polarizer 105, a space Light modulator 106, analyzer 107, Kohler mirror 108, aperture stop 109, field stop 110...