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Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism

A Fresnel biprism, digital hologram technology, applied in the recording/reproducing/erasing, optical recording/reproducing/erasing methods using optical interference patterns, etc., to achieve good dynamics, simple structure, and deformation detection. Effect

Inactive Publication Date: 2011-07-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method realizes single-beam recording of off-axis holograms, but the carrier frequency of the holograms depends on the splitter prism, which requires the tester to have a certain understanding of the measurement principle to ensure that the state of the instrument meets the test requirements

Method used

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  • Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism
  • Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism
  • Coaxial recording device for digital hologram of transparent substance based on beam-splitting property of Fresnel biprism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] see figure 1 and figure 2 , the coaxial transparent material digital hologram recording device of Fresnel double prism light splitting, including a laser (1), a beam expander assembly (2-4), a Fresnel double prism (6), a CCD A camera (8), a baffle plate (7) and a computer (9), characterized in that the beam expander assembly (2-4) is set on the optical path of the beam emitted by the laser (1), The measured object (5) is placed in the optical path between the Fresnel prism (6) and the beam expansion period (2-4), and the CCD camera ( 8) Align the Fresnel double prism (6), set the baffle plate (7) around the CCD camera (8), and the CCD camera (8) is connected to the computer (9); the beam emitted by the laser passes through the beam expander assembly After (2-4), part of the light passes through the measured object (5), and then splits the light through the Fresnel biprism (6), the non-measurement beam is absorbed or blocked by the baffle plate (7), and the overlappin...

Embodiment 2

[0025] see figure 2 , the present embodiment is basically the same as the first embodiment and the special features are as follows:

[0026] The beam expander assembly (2-4) is composed of a mirror (3) arranged on the optical path behind the spatial filter (2), and a negative lens (4) is placed behind the mirror (3); the spatial filter (2) ) and the negative lens (4) play the role of beam expansion, wherein the negative lens (4) is required to be installed on the guide rail so that it can move along the optical axis; the function of the mirror (3) is to turn the beam direction to reduce the overall The transverse overall length dimension of the device.

[0027] The object to be measured (5) is a transparent object, placed between the negative lens (4) and the Fresnel biprism (5), and required to be within the space beam angle below the optical axis.

[0028] The refractive index of the Fresnel double prism (4) is , whose top angle The selection of the size needs to be s...

Embodiment 3

[0031] see figure 2 and 3 , this embodiment is the same as Embodiment 2, and its working principle is as follows: the light beam emitted by the laser (1) is focused at point S after passing through the spatial filter (2), and since the negative lens (4) has a diverging effect on the light beam, it passes through the negative lens (4). The converging point of the light beam after the projection lens (4) is S', that is, the light beam passing through the negative lens (4) can be regarded as being emitted through the point S'. Investigate the overlapping area (that is, the area received by the CCD camera (8)) of the two beams of light after the Fresnel double prism (6), and assume that the included angle of the Fresnel double prism (6) is θ , the refractive index of the prism is n , then the opening angle of the beam corresponding to the overlapping area is:

[0032] (1)

[0033] (2)

[0034] Su...

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Abstract

The invention relates to a coaxial digital holographic measuring device for a transparent substance based on the beam-splitting property of a Fresnel biprism. The measuring device consists of a laser, a beam expander, a transparent object to be measured, a Fresnel biprism, a CCD (charge coupled device) camera and the like. In the invention, after light sent by the laser is expanded, one part of the light is projected on the Fresnel biprism through the object to be measured and then is split into two beams which form an included angle, and interference information between the two beams is recorded by the CCD camera; and meanwhile one coherent beam of the two beams passes through the object to be measured, thus forming a hologram carried with object information. The device has the advantages of fewer components, simple structure and good portability; and the recording device can be applied to testing structural and state parameters of the transparent substances such as a transparent medium, a living cell and the like.

Description

technical field [0001] The invention relates to a coaxial transparent material digital holographic recording device based on Fresnel double prism light splitting, mainly used for measuring the structure and state parameters of transparent objects, that is, pure phase objects, such as living cells, optical fibers, micro slides, etc. Such as deformation and so on. Background technique [0002] Digital holography technology is an important measurement technology developed in recent years, and has been widely used in object contour and state parameters. The recording methods used can be divided into two types, one is the coaxial recording method, the advantage is that only one beam of light is needed, and the device structure is often simple, but the digital hologram reproduction algorithm is more complicated, and there are certain requirements for the recording medium, such as transparency Advanced; the application is more off-axis recording method, the advantage is that when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/0065
Inventor 于瀛洁郭路周文静刘钧琦
Owner SHANGHAI UNIV
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