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Complex amplitude imaging method and system

An imaging system and imaging method technology, which can be applied to instruments, measuring devices, scientific instruments, etc., can solve the problem of many iterative calculations, and achieve the effect of compact imaging optical path.

Pending Publication Date: 2022-05-13
TSINGHUA UNIV
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Problems solved by technology

This method can only reconstruct the complex amplitude field in the restricted aperture, and requires a large number of iterative calculations

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  • Complex amplitude imaging method and system
  • Complex amplitude imaging method and system

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Embodiment Construction

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0042] figure 1 is an illustrated complex amplitude imaging system according to one embodiment of the invention.

[0043] Such as figure 1 As shown, the complex amplitude imaging system includes: a coherent light source 1, a beam expander 2, a spatial filter 3, a collimator lens 4, a dichroic prism 6, a phase modulation plate 7, a first image sensor 8, a second image sensor device 9 and computer 10, the object to be measured 5 is placed between the collimato...

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Abstract

The invention belongs to the technical field of optical phase recovery and phase measurement, and particularly relates to a complex amplitude imaging method and system. Comprising the following steps: illuminating a to-be-measured sample by using monochromatic light or quasi monochromatic light to generate complex amplitude wavefront containing information of a to-be-measured object; a complex amplitude wavefront is equally divided into two paths by a beam splitter prism, one path is directly recorded by a camera, the other path is modulated by a modulation phase plate, and the camera records the intensity after diffraction for a distance; taking the two intensity images as intensity constraints, modulating the phase value of the phase plate as phase constraints, and inputting the phase constraints into a reconstruction algorithm; and iteratively reconstructing the complex amplitude wavefront containing the sample information. According to the invention, full recording of a complex amplitude field in a simple and compact light path is realized, and the complex amplitude of light is reconstructed from the amplitude by using a compact and robust light path module. The maximum advantage is that the imaging light path is compact, the complex amplitude of the reconstructed light is recorded by using the intensity response device, and a slowly varying complex amplitude field can be reconstructed.

Description

technical field [0001] The invention belongs to the technical field of optical phase recovery and phase measurement, and in particular relates to a complex amplitude imaging method and system. Background technique [0002] Imaging systems operating in the visible light band directly expand the visual capabilities of the human eye. Visible light has 10 15 Hz level of ultra-high frequency, while the response speed of the current single-pixel photodetector device is 10 9 Hz level, so it is difficult to directly record the phase information of visible monochromatic light using current photodetector devices. Currently widely used image sensors can only directly record the intensity information of light, and the phase information of light is completely lost. In biological research, industrial detection, consumer electronics and other fields, the phase of light has important applications. At present, although the phase information of light can be quantitatively recorded through...

Claims

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Application Information

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IPC IPC(8): G01N21/47
CPCG01N21/4788
Inventor 曹良才李儒佳高云晖黄郑重杨峰张航瑛
Owner TSINGHUA UNIV
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