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High resolution ratio digital holographic image capturing device

A digital holography, high-resolution technology, applied in the field of digital holography, can solve the problems of small field of view and low resolution of digital holographic reproduced image, to increase the field of view, increase the area of ​​​​the hologram, and improve the reproduced image of digital holography. The effect of resolution

Inactive Publication Date: 2008-02-13
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
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  • High resolution ratio digital holographic image capturing device

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Embodiment 1

[0021] Device Embodiment 1: Please refer to FIG. 1 , the high-resolution digital holographic image acquisition device 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 , a sample 5 , a beam expander 8 , a pinhole 9 , a semi-transparent mirror 6 , a linear CCD 10 , a two-dimensionally movable micro-displacement platform 11 , and a computer 12 .

[0022] Wherein, the beam splitter 2 is a beam splitter with adjustable beam splitting ratio, which is arranged on the optical path of the light beam emitted by the helium-neon laser 1, and can divide the light beam into a first beam and a second beam. The first total reflection mirror 3 is disposed on the optical path of the first beam, and reflects the first beam to the beam expander collimator 4 . After the first beam is expanded and collimated into parallel light by the beam expander collimator 4 , the sample 5 is then irradiated, an...

Embodiment 2

[0032] Device Embodiment 2: Referring to FIG. 2, the method and device for acquiring a high-resolution digital holographic image 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 array CCD 10 , a two-dimensionally movable micro-displacement platform 11 , and a computer 12 .

[0033] Comparing the second embodiment shown in FIG. 2 with the first embodiment shown in FIG. 1 , 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 present invention. The half mirror 6 described in the first embodiment directly interferes. The formed interference fringes are collected by the linear CCD 10 in the interference area through the movement of the micro-displacement platform 11 to realize push-broom collection, and th...

Embodiment 3

[0034] Device Embodiment 3: Referring to FIG. 3 , the method and device for acquiring a high-resolution digital holographic image include a helium-neon laser 1 , a beam splitter 2 , a first total reflection mirror 3 , and a second total reflection mirror 7 , a beam expander collimator 4, a sample 14, a microscope objective lens 8, a pinhole 9, a semi-transparent mirror 6, a linear array CCD combination 15, a two-dimensional movable micro-displacement platform 11, a computer 12.

[0035] Comparing the embodiment shown in FIG. 3 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 beam, and reflects the first beam to the beam expander. Straightener 4. After the first beam is expanded by the beam expander and collimator 4 and collimated into parallel light, it passes through the half mirror 6 and then illuminates the sample 14 . The first light beam reflected from the sample 14 is emitte...

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Abstract

The invention discloses a high-resolution digital holographic image acquisition device. The first beam irradiates the sample after the beam emitted by the laser passes through the beam splitting device, and the second beam is converted into spherical light waves through the beam expander and the first beam after irradiating the sample. The light beam forms an interference area, and the linear array CCD is arranged on a two-dimensionally movable micro-displacement platform and is located in the interference area. The point source of the spherical light wave is equal to the optical path of the object light wave from the sample to the linear array CCD. The computer It is electrically connected with the linear array CCD and the micro-displacement platform. The linear array CCD push-brooms the interference fringes generated by the first and second light beams to collect and synthesize a digital hologram, and the digital hologram is numerically reconstructed by the computer through fast Fourier transform algorithm and digital image processing, etc. Finally, a high-resolution digital holographic reconstruction image is obtained. The invention effectively increases the area of ​​the recorded hologram, improves the resolution of the digital hologram reproduced image, and increases the field of view.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to a device for acquiring a digital holographic image. Background technique [0002] Digital holography technology uses solid-state imaging device CCD (Charge Coupled Device, charge coupled device) or CMOS (Complementary Metal-Oxide Semiconductor, metal oxide semiconductor) to replace traditional silver salt dry plate to record hologram, through computer numerical simulation of digital hologram It uses the fast Fourier transform algorithm and spectral filtering to obtain the amplitude and phase information of the object light wave field, realizes the three-dimensional object light wave field reconstruction, avoids the traditional wet chemical processing process, and has the advantages of fast, real-time, etc. . [0003] However, digital holography has been unable to achieve the resolution of traditional optical holography. The main reason is that the area array CCD or C...

Claims

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Application Information

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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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