Computational Ghost Imaging System and Method Based on Kohler Illumination

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.

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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Problems solved by technology

[0005] For this reason, an object of the present invention is to propose a computational ghost imaging system based on Koehler illumination to solve the problem of mutual constraints between image contrast and resolution in the process of ghost imaging

[0007] Another object of the present invention is to propose a computational ghost imaging method based on Koehler illumination to solve the problem of mutual constraints between image contrast and resolution in the process of ghost imaging

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