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Device and method for expanding depth of field of imaging system based on scattering

A technology for expanding devices and imaging systems, which is applied in the field of depth-of-field expansion devices for imaging systems based on scattering, can solve the problems of multiple time-consuming, optical path accuracy, and extremely high installation and adjustment requirements, and achieves low cost, high practicability, and good effect. Effect

Active Publication Date: 2021-09-28
NANJING UNIV OF SCI & TECH
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  • Summary
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above method requires multiple time-consuming shots or custom-made special masks. At the same time, the accuracy of the optical path and the requirements for adjustment are also extremely high.

Method used

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  • Device and method for expanding depth of field of imaging system based on scattering
  • Device and method for expanding depth of field of imaging system based on scattering
  • Device and method for expanding depth of field of imaging system based on scattering

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Embodiment Construction

[0032] Such as figure 1 As shown, a device for expanding the depth of field of an imaging system based on scattering includes a light source 1, a rotating frosted glass 2, a first lens 3, a first diaphragm 4, a measured object surface 5, a second lens 6, a scattering medium 7, and a second light Diaphragm 8, photodetector 9, computer 10;

[0033] The light source 1, the first lens 3, the first aperture 4, the second lens 6, the scattering medium 7, the second aperture 8, and the photodetector 9 are sequentially placed along the optical axis, and the measured object surface 5 is arranged on the first At any position between the diaphragm 4 and the second lens 6, the rotating frosted glass 2 is placed between the light source 1 and the first lens 3 parallel to and half-intersecting the optical axis, and the computer 10 is used to record the light intensity detected by the photodetector 9 Information and object reconstruction based on light intensity information;

[0034] The c...

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Abstract

The invention discloses a device and method for expanding the depth of field of an imaging system based on scattering. In the method, a scattering cut-off is placed in front of a photodetector, and then a pinhole is placed in the center of the optical axis of the object plane. Speckle is formed on the surface, the speckle formed by the pinhole and the speckle generated by the object are collected, and the object under test can be reconstructed by deconvolution operation on the two images collected by the detector. The invention can realize the expansion of the depth of field by simple optical means, and has high resolution, high stability, strong reliability, no need to change the structure of the optical path, low cost and strong practicability.

Description

technical field [0001] The invention belongs to scattering imaging technology, in particular to a device and method for expanding the depth of field of an imaging system based on scattering. Background technique [0002] Scattering media are ubiquitous objects in life. In recent years, through in-depth research on scattering media, it has been found that the propagation of light beams in thin scattering media can be regarded as a linear process. Since then, scattering media have been regarded as having considerable DOF optics. [0003] For an imaging system with fixed focal length and numerical aperture, when the detection position and the position of the measured object cannot be changed, the imaging of objects outside the depth of field range is often blurred. Generally speaking, the depth of field can be increased by reducing the numerical aperture, but as the clear aperture decreases, the output light energy will also decrease, which will reduce the resolution of the im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B26/06H04N5/225
CPCG02B26/06H04N23/55
Inventor 辛煜韩伟张也庄秋实何泽文
Owner NANJING UNIV OF SCI & TECH