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High resolution ratio digital holographic image capturing device

A digital holographic, high-resolution technology, which is applied in the field of digital holography, can solve the problems of low resolution and small field of view of digital holographic reproduction images, and achieve the purpose of increasing the area of ​​holograms, increasing the field of view, and improving digital holographic reproduction images. The effect of resolution

Inactive Publication Date: 2010-12-15
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of low resolution and small field of view of digital holographic reconstruction images in the prior art, the present invention proposes a high-resolution digital holographic image acquisition device based on linear array CCD push-broom to improve the resolution of digital holographic reconstruction images and increase its field of view

Method used

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  • High resolution ratio digital holographic image capturing device
  • High resolution ratio digital holographic image capturing device
  • High resolution ratio digital holographic image capturing device

Examples

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Effect test

Embodiment 1

[0021] Device Example 1: See figure 1 , the acquisition device of the high-resolution digital hologram includes a helium-neon laser 1, a beam splitter 2, a first total reflection mirror 3, a second total reflection mirror 7, a beam expander collimator 4, the same Product 5, a beam expander 8, a pinhole 9, a semi-transparent and semi-reflective mirror 6, a linear array CCD 10, a micro-displacement platform 11 capable of moving in two-dimensional directions, and a computer 12.

[0022] Wherein, the beam splitter 2 is an adjustable splitting ratio beam splitter, which is arranged on the optical path of the beam emitted by the He-Ne laser 1, and can split the beam into a first beam and a second beam. The first total reflection mirror 3 is arranged on the optical path of the first beam, and reflects the first beam to the beam expander and collimator 4 . After the first light beam is expanded and collimated into parallel light by the beam expander and collimator 4 , it irradiates t...

Embodiment 2

[0032] Device embodiment 2: see figure 2 The acquisition method and device of the high-resolution digital hologram include a semiconductor laser 13, a beam splitter 2, a first total reflection mirror 3, a second total reflection mirror 7, a beam expander collimator 4, A sample 5 , a beam expander 8 , a pinhole 9 , a linear CCD 10 , a two-dimensionally movable micro-displacement platform 11 , and a computer 12 .

[0033] Will figure 2 The second embodiment shown with figure 1 Comparing the first embodiment shown, it can be found that the first light beam as the object light and the second light beam as the reference light formed by the semiconductor laser 13 have not undergone the transflective and semi-reflective process described in the first embodiment of the present invention. mirror 6, and the interference occurs directly. The formed interference fringes are collected by the linear array CCD 10 in the interference area through the movement of the micro-displacement pl...

Embodiment 3

[0034] Device embodiment 3: see image 3 The acquisition method and device of the high-resolution digital hologram include a helium-neon laser 1, a beam splitter 2, a first total reflection mirror 3, a second total reflection mirror 7, a beam expander collimator 4 , a sample 14, a microscope objective lens 8, a pinhole 9, a half-transparent mirror 6, a line-array CCD combination 15, a two-dimensionally movable micro-displacement platform 11, and a computer 12.

[0035] Will image 3 Comparing the embodiment shown with the embodiment 1 shown in the figure, it can be found that the first total reflection mirror 2 is arranged on the optical path of the first light beam, and reflects the first light beam to the beam expander collimator 4 . The first light beam is expanded and collimated into parallel light by the beam expander and collimator 4 , passes through the half mirror 6 , and then irradiates the sample 14 . The first light beam reflected from the sample 14 is emitted to...

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Abstract

The utility model is an acquisition device of high resolution digital holograph. A first one of beams from a laser shines down on a sample through a beam splitting device. A second one of the beams from the laser is converted into a spherical light-wave and then, together with the first beam, forms an interference area. A CCD line array is arranged on a micrometric displacement platform that can move in a two-dimensional direction, which is positioned in the interference area. A point source of the spherical light-wave is equal to an optical length from an object light-wave to the CCO line array. The computer, the CCD line array and the micrometric displacement platform are electrically connected. The CCD line array has a push-broom collection of interference fringes made by the first andthe second beams and synthesizes the digital holograph. The digital holograph executes a numerical reconstruction by means of fast Fourier transform algorithm and digital image processing, obtaining the highest resolution digital holographic representation image at last. The invention effectively enlarges an area of a recorded holograph, improves the resolution of the holographic representation image and widens a field of view.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to a digital holographic acquisition device. Background technique [0002] Digital holography technology uses solid-state imaging devices CCD (Charge Coupled Device, Charge Coupled Device) or CMOS (Complementary Metal-Oxide Semiconductor, Metal Oxide Semiconductor) to replace traditional silver salt dry plates to record holograms, and simulate digital holograms through computer numerical simulation The diffraction reproduction process, using the fast Fourier transform algorithm and spectral filtering processing to obtain the amplitude and phase information of the object optical wave field, realizes the reconstruction of the three-dimensional object optical wave field, avoids the traditional wet chemical processing process, and has the advantages of fast and real-time . [0003] However, digital holography has been unable to achieve the resolution of conventional optical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/08G02B27/10G06E1/02
Inventor 赵建林邸江磊杨德兴姜宏振张鹏范琦
Owner NORTHWESTERN POLYTECHNICAL UNIV
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