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Super-resolution digital holographic imaging system and imaging method

A digital holography and super-resolution technology, applied in instruments and other directions, can solve the problem that the lateral resolution of digital holography needs to be improved, and achieve the effect of strong scalability and high resolution

Active Publication Date: 2019-05-03
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the resolution and size of existing image sensors, the lateral resolution of digital holography needs to be improved

Method used

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  • Super-resolution digital holographic imaging system and imaging method
  • Super-resolution digital holographic imaging system and imaging method
  • Super-resolution digital holographic imaging system and imaging method

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 as shown, figure 1 It is a schematic diagram of a super-resolution digital holographic imaging system; as shown in the figure, this imaging system includes: the attenuation sheet 2 is placed sequentially on the coaxial direction of the laser 1, the beam expander 3 generates a larger beam, and then passes through the transmission type SLM 4 generates structured light, which is then divided into two beams of light waves with the same energy by the first beam splitting plate 5; one beam is reflected by the first reflector 6 and then transmitted through the second beam splitting plate 10 to exit in parallel on the surface of the object 11 to be measured , the reflected light from the surface of the object 11 to be measured is reflected by the second spectroscopic flat plate 10, and then enters the image sensor 12 as object light; The focused lig...

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Abstract

The invention discloses a super-resolution digital holographic imaging system and a super-resolution digital holographic imaging method. The super-resolution digital holographic imaging system is characterized in that a trnasmissive spatial light modulator (SLM) is additionally arranged in front of a conventional Mach-Zehnder holographic optical path, fringe patterns in different directions are generated in the SLM so as to generate structured light in different directions, and an image sensor acquires a series of holograms formed by illumination of the structured light. The super-resolution digital holographic imaging method comprises the steps of performing Fourier transform on each hologram in a computer, superimposing the series of holograms in a spatial frequency domain, then demodulating high-frequency information of the holograms, and finally using a classical reconstruction algorithm of digital holography to achieve higher resolution imaging of objects. The super-resolution digital holographic imaging method provides a new solution for improving the resolution of the digital holographic imaging system.

Description

technical field [0001] The invention relates to the technical field of digital holographic imaging, in particular to a super-resolution digital holographic imaging system and an imaging method. Background technique [0002] Digital holography is the combination of computer technology and holography, using image sensors to replace the original holographic dry plate to record holograms, and process the holograms in the computer. It is not limited by the optical system, directly records the interference hologram, and then obtains the structural information of the measured object through calculation and processing, and its longitudinal resolution can reach the sub-nanometer level. Digital holographic microscopy technology not only has the characteristics of high precision and non-contact of other optical measurement technologies, but also has a simple system, no need to image the measured object, no need to scan, and all filtering processing is completed by computer, which has s...

Claims

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Application Information

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IPC IPC(8): G03H1/22G03H1/26
Inventor 金川何渝唐燕魏宏斌赵立新胡松
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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