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Stacked diffraction imaging device

The technology of an imaging device and an adjusting device is applied in the field of diffraction imaging and holographic imaging to achieve the effect of reducing the pattern receiving time

Pending Publication Date: 2017-11-07
HEBEI UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method still needs to adjust the phase mask, which still requires a certain data acquisition time

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: A stacked diffractive imaging device using a phase-type spatial light modulator

[0026] A laminated diffraction imaging device, the main structure of which is as follows figure 1 As shown, the beam adjustment device uses a transmissive spatial light modulator 6, which is fixed inside the device (the fixture is not shown), and the incident light and outgoing light of the spatial light modulator 6 have their own angle-adjusted polarizers (not shown) to ensure that they operate in phase-only mode.

[0027] The other parts of the device are described in detail below according to the propagating direction of the incident light beam. The device includes a shutter 1, and when the shutter 1 is pressed, all receiving devices charge-coupled device (CCD) industrial cameras 8 take pictures at the same time. The exposure time of the camera 8 is adjustable, and the minimum is 0.005 seconds.

[0028] The spectroscopic device of the device is composed of a prism group...

Embodiment 2

[0032] Embodiment 2: A stacked diffraction imaging device using a checkerboard grid-like amplitude template

[0033] A laminated diffraction imaging device, the main structure of which is as follows Figure 4 As shown, the beam adjustment device uses amplitude-type lattice templates 61-65, which are fixed inside the device (fixtures are not shown), and its working part is composed of several grids, which are divided into fully transparent and semi-transparent or opaque Two types, the light transmittance of the former is close to 1, the light transmittance of the latter is less than 0.8, or even 0, and the light transmittance of the latter is 0 in this example. These two grids are randomly distributed. In order to prevent the grid corresponding to a certain part of the beam from being 0 or 1, we use the templates of two adjacent outgoing beams as complementary, that is, the transmittance of a template is 0 The grid of the other template corresponds to a grid transmittance of 1...

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Abstract

The invention discloses a stacked diffraction imaging device, and belongs to the diffraction imaging and holographic imaging fields. Incident light containing an object information quantity is divided into a plurality of outgoing beams through utilization of a light splitting prism group, an optical fiber or other light splitting devices in the method, and each outgoing beam corresponds to a receiving device; and, before outgoing beams enter the receiving devices, a spatial light modulator or a fixed template is used to adjust an amplitude and a phase of each outgoing beam or distribution of the amplitude or the phase of each outgoing beam, so a set of related diffraction patterns can be obtained, reconstruction is performed then by utilizing a stacked diffraction algorithm, and amplitude and phase information, i.e., a holographic image, of an object is obtained. Diffraction patterns of multiple objects can be simultaneously obtained through photographing at a time by utilizing the device, pattern reception time is greatly reduced; separation of light spots are not needed when a sample image is reconstructed; and, after the device is assembled, a parameter of the device can be kept at a certain value, the device can be used again without repeated adjustments, and industrial applications are facilitated.

Description

technical field [0001] The invention belongs to the fields of diffraction imaging and holographic imaging, and specifically relates to dividing incident light containing object information into multiple sub-beams by using a spectroscopic device, and then adjusting the amplitude, phase or one of the two sub-beams to obtain multiple correlations. The diffraction pattern of the object is reconstructed using the stacked diffraction algorithm to obtain a holographic image of the object. Background technique [0002] Ptychography is a new method of obtaining holograms of objects developed in the past ten years. Different from traditional holography, this method does not require reference light, but obtains holograms by changing the relative position of light waves and objects. A series of diffraction spots, the spot irradiated on the object overlaps with at least one other spot. Diffraction spots are recorded by CMOS, CCD and other devices, and then computer programs can be used ...

Claims

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Application Information

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IPC IPC(8): G03H1/12
CPCG03H1/12
Inventor 董昭沙笑慧王华英
Owner HEBEI UNIV OF ENG