Three-view-field digital holographic detection device and method based on two-dimensional period grating and point diffraction

A two-dimensional periodic, digital holographic technology, applied in measurement devices, optical devices, instruments, etc., can solve the problems of difficult alignment, low utilization rate of CCD field of view, and high difficulty in structural alignment, and achieves simple structure and high efficiency. Field of view utilization and low system positioning complexity requirements

Active Publication Date: 2017-11-17
HARBIN ENG UNIV
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Problems solved by technology

But its structural alignment is more difficult
[0006] It can be found that the current multi-field digital holographic detection technology generally has shortcomings such as difficult collimation and low utilization of CCD field of view.

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  • Three-view-field digital holographic detection device and method based on two-dimensional period grating and point diffraction
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  • Three-view-field digital holographic detection device and method based on two-dimensional period grating and point diffraction

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[0026] The three-field digital holographic detection device and method based on two-dimensional periodic grating and point diffraction of the present invention includes a light source with an emission wavelength of λ, a polarizer I, a collimated beam expanding device, a measurement window, an object to be measured, and a second One lens, two-dimensional periodic grating, hole array, polarizer II, polarizer III, polarizer IV, second lens, diaphragm, image sensor and computer. The light emitted by the light source with the emission wavelength λ is modulated by a linear polarizer into 45° linearly polarized light and then enters the collimated beam expander. The collimated and expanded beam passes through the measurement window and the object to be measured and then enters the first lens , The outgoing light beam condensed by the first lens passes through the two-dimensional periodic grating, and is filtered by the hole array to form the reference light and the three object lights ...

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Abstract

The invention relates to a three-view-field digital holographic detection device and method based on a two-dimensional period grating and point diffraction. The device comprises a light source (1) with emission wavelength lambda, a polarizer I (2), a collimating beam expansion device (3), a measurement window (4), a to-be-detected object (5), a first lens (6), a two-dimensional period grating (7), a hole array (8), a polarizer II (9), a polarizer III (10), a polarizer IIII (11), a second lens (12), a diaphragm (13), an image sensor (14) and a computer (15). View field translation and frequency domain separation are realized through two-dimensional period grating light splitting and carrier wave introduction, interference among three beams of object light can be avoided through the polarizer set, and crosstalk among frequency spectrum can be reduced. The device is advantaged in that the device is simple and easy and is convenient for adjustment, an image sensor view field utilization rate is high, the hologram carrier wave frequency mapping relationship is simple, easy determination is realized, through grating defocusing accurate control, system carrier wave frequency determination complexity is low, and efficiency of a phase recovery algorithm is high.

Description

Technical field [0001] The invention belongs to the field of digital holographic detection, and particularly relates to a three-field digital holographic detection device and method based on two-dimensional periodic grating and dot diffraction. Background technique [0002] On the basis of holography, digital holography uses CCD or CMOS as image collectors instead of holographic recording materials (such as holographic dry plates, etc.) to record digital holograms, and save the digital holograms in a computer. Diffraction propagation process realizes reconstruction imaging of digital hologram. As a new type of three-dimensional digital imaging technology, digital holography involves digitization in the recording and reconstruction imaging processes. Among them, off-axis holography uses the object light with a certain angle and the reference light to interfere, and the phase information of the object to be measured can be obtained from the formed single carrier frequency interfer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B9/021
Inventor 钟志刘磊单明广刘彬张雅彬王红茹
Owner HARBIN ENG UNIV
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