Apparatus and method for scattering imaging through a dynamic liquid medium

A scattering imaging and dynamic liquid technology, applied in the measurement of scattering characteristics, etc., can solve the problems of inability to obtain phase information, the influence of imaging resolution, and the inability to achieve long-distance imaging, so as to expand the depth of field range, improve imaging resolution, and achieve good results. Effect

Active Publication Date: 2021-11-26
XIDIAN UNIV
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Problems solved by technology

However, the imaging distance of existing ballistic light-based methods through dynamic scattering media is proportional to the number of received ballistic photons, and it is impossible to achieve long-distance imaging through dynamic scattering media.
The existing scattered light imaging method combines the holographic interference of the speckle field, and only needs to collect a single frame of speckle data, but the imaging resolution is affected by the size of the reference point source, and can only restore the outline of the target, and cannot obtain accurate phase information

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  • Apparatus and method for scattering imaging through a dynamic liquid medium
  • Apparatus and method for scattering imaging through a dynamic liquid medium
  • Apparatus and method for scattering imaging through a dynamic liquid medium

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Embodiment 1

[0053] This embodiment proposes a device that realizes scattering imaging through a dynamic liquid medium by modulating a Gaussian beam into a non-diffraction zero-order Bessel beam, using the shower curtain effect and the principle of speckle lighting. The system is simple, stable and low cost Inexpensive, large imaging depth of field, high resolution.

[0054] See figure 1 , figure 1 It is a schematic structural diagram of a scattering imaging device through a dynamic liquid medium provided by an embodiment of the present invention. The scattering imaging device includes a light source and adjustment module 1, a spatial light modulator 2, a dynamic imaging module 3 and an image detection module 4, wherein the light source and adjustment module 1 is used to generate a collimated Gaussian beam and enter the spatial light modulator 2 ; The phase pattern of the zero-order Bessel beam that has been generated is loaded on the spatial light modulator 2, which is used to modulate ...

Embodiment 2

[0091] On the basis of the above embodiments, this embodiment provides a scattering imaging method through a dynamic liquid medium. See figure 2 , figure 2 It is a flowchart of a scattering imaging method through a dynamic liquid medium provided by an embodiment of the present invention.

[0092] The scatter imaging method includes:

[0093] S1: Obtain multi-frame speckle patterns of the target to be measured through the scattering imaging device;

[0094] Further, the multi-frame speckle pattern is obtained based on the scattering imaging device described in Embodiment 1, and step S1 includes:

[0095]S11: controlling the ground glass in the scattering imaging device to rotate n times, each rotation angle being 0.1°;

[0096] Specifically, according to figure 1 Build a transmissive imaging optical path; turn on the laser light source 11, and the light signal sent by the light source is irradiated onto the spatial light modulator (SLM) through the adjustment of the beam...

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Abstract

The invention discloses a scattering imaging device and method through a dynamic liquid medium. The device includes a light source and an adjustment module, a spatial light modulator, a dynamic imaging module, and an image detection module, wherein the light source and the adjustment module are used to generate accurate Straight Gaussian beam; the phase pattern of the zero-order Bessel beam is loaded on the spatial light modulator, which is used to modulate the Gaussian beam into a zero-order Bessel beam without diffraction; the dynamic imaging module includes ground glass and dynamic scattering medium, ground glass The target to be measured is set between the dynamic scattering medium, and the ground glass can rotate in a direction perpendicular to the optical path for scattering the zero-order Bessel beam. The dynamic scattering medium is used to obtain the spectral information of the light field at the target to be measured. The invention modulates the incident Gaussian beam into a non-diffraction zero-order Bessel beam, so that the scattering imaging effect through the dynamic liquid medium is better, and the imaging resolution is improved.

Description

technical field [0001] The invention belongs to the technical field of scattering imaging, and in particular relates to a scattering imaging device and method through a dynamic liquid medium. Background technique [0002] Dynamic scattering medium refers to the scattering medium in which internal particles move at high speed and disorderly over time, including clouds, smog, smoke, turbid water, living biological tissues, etc. Due to the uneven distribution of the refractive index inside the dynamic scattering medium, the light wave will undergo strong multiple scattering when it is transmitted inside, resulting in blurred images, and even the complete loss of target information hidden behind the dynamic scattering medium; at the same time, the dynamic scattering medium The rapid movement of the scattering medium causes the physical parameters such as the transmission mean free path, decorrelation time, and decorrelation bandwidth to change. As a result, the current imaging m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/49
CPCG01N21/49
Inventor 邵晓鹏吴雨祥何顺福孙雪莹计婷朱进进蔡晓健张乐
Owner XIDIAN UNIV
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