Computed ghost imaging system and computed ghost imaging method based on Kohler illumination

Abstract

The invention discloses a computed ghost imaging system and a computed ghost imaging method based on Kohler illumination. The system comprises a He-Ne laser device, a beam expander, a collimating lens, a diaphragm, a polarizer, a spatial light modulator, an analyzer, a Kohler mirror, an aperture diaphragm, a field diaphragm, a collecting lens, a to-be-imaged object, a convergent lens and a bucket detection orderly arranged on a light path, wherein the spatial light modulator and the bucket detector are respectively in electrical connection with a computer, the computer is used for acquiring a high-contrast image of the to-be-imaged object through the computed ghost imaging technology, and a Kohler illumination mode and a Lorentz shaping incoherent light source are introduced into a computed ghost imaging process. In the system and the method provided by the invention, in combination with the Kohler illumination mode and the Lorentz shaping incoherent light source, a defect of unevenness of intensity of illumination of an object plane can be eliminated and resolving power of the computed ghost imaging system can be improved, and high-contrast and high-resolution computed ghost imaging of the to-be-imaged object can be realized.

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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