Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate

A rotating disk and compressed sensing technology, applied in the field of terahertz wave imaging, can solve the problems of unsatisfactory imaging speed and imaging quality, limited number of matrices, large volume, etc., and achieve the effect of fast speed, small size and high imaging quality

Inactive Publication Date: 2017-04-26
TIANJIN UNIV
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It is not difficult to see that the imaging speed and imaging quality of the system are not ideal for the method of constantly changing the mask and continuously adjusting the DMD (Digital Micromirror Device); while the method of translating a large rectangular mask, one On the one hand, the translation of the mask plate is driven by the lateral displacement platform, although the imaging speed has been improved, but it is still slow; on the other hand, its volume is large, and the number of matrices that can be designed to be filled and used for modulation is extremely limited

Method used

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  • Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate
  • Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate
  • Terahertz wave compression perception rapid imaging apparatus based on rotation disc-like mask plate

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Embodiment 1

[0035] A fast imaging device of terahertz wave compressed sensing based on rotating disc-shaped mask, see figure 1 , Mainly includes:

[0036] The mask plate 4 capable of realizing terahertz wave transmission, and its outer shape is a disc shape.

[0037] See figure 2 , The mask matrix in the mask plate 4 is a binary Toplitz matrix containing [0,1] made of thin metal sheets, where "1" corresponds to hollow square holes, and "0" corresponds to non-hollow square holes.

[0038] The mask 4 and the imaging object 3 are placed in parallel in the light path, so that the terahertz wave carrying the information of the imaging object 3 passes through the modulation window 5 on the disc mask 4 to achieve transmission modulation.

[0039] A terahertz wave parabolic mirror 7 is used to converge the transmitted light at the focal point, and a terahertz detector 8 is used to detect its intensity.

[0040] Continuously rotating the disc mask 4 measures multiple sets of data, and inputs them into the ...

Embodiment 2

[0045] Combine below Figure 1 to Figure 3 The solution in Example 1 is introduced in detail, see the following description for details:

[0046] Reference figure 1 , A fast imaging device for compressive sensing of terahertz waves based on a rotating disc mask, which mainly includes: a disc mask 4 that can achieve partial transmission, a modulation window 5 arranged on the disc mask 4, and terahertz waves Parabolic mirror 7 and terahertz wave detector 8.

[0047] Among them, the disc mask 4 can be driven to rotate by a rotating motor 6 at the center, and the modulation matrix is ​​a Toplitz matrix. The terahertz wave parabolic mirror 7 is arranged between the modulation window 5 and the terahertz wave detector 8. The imaging object 3 is placed between the beam expanding system 2 and the disc mask 4.

[0048] When it is implemented:

[0049] First, the terahertz source 1 generates a terahertz wave output, and expands the beam through the beam expanding system 2, so that it can comp...

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Abstract

The invention discloses a terahertz wave compression perception rapid imaging apparatus based on a rotation disc-like mask plate. The apparatus comprises a mask plate used for realizing terahertz wave transmission, the profile of the mask plate is disc-like, a mask matrix in the mask plate is a binary Toeplitz matrix which is prepared by use of a metal sheet and comprises [0, 1], wherein "1" is corresponding to a hollow square hole and "0" is corresponding to a non-hollow square hole; the mask plate and an imaging object are arranged in parallel in an optical path, terahertz waves carrying the imaging object information realize transmission modulation after passing through a modulation window in the disc-like mask plate; and transmitted light is gathered at a focus by use of one terahertz wave paraboloidal mirror, and the intensity is detected by use of one terahertz detector. According to the invention, the sampling efficiency and the speed of terahertz compression perception can be greatly improved at a modulation phase of terahertz wave compression perception imaging, i.e., faster imaging is realized.

Description

Technical field [0001] The invention relates to the field of terahertz wave imaging, in particular to a terahertz wave compressed sensing fast imaging device based on a rotating disc-shaped mask plate. Background technique [0002] Terahertz (terahertz, THz for short) waves usually refer to electromagnetic waves with a frequency of 0.1 to 10 THz (wavelength of 0.03 to 3 mm). As a radiation source with unique advantages, terahertz waves have important scientific significance and great research value. [0003] Terahertz imaging technology was first realized by Hu and Nuss in 1995. For a long time, terahertz imaging systems have mostly adopted point-by-point scanning imaging or array imaging, but these two methods have the disadvantages of slow imaging speed or low sensitivity. In recent years, a terahertz imaging method based on compressed sensing has been proposed to improve the defects of point-by-point scanning imaging and array imaging. The so-called compressed sensing is a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/02
CPCG01J3/0229
Inventor 王与烨任宇琛徐德刚陈霖宇唐隆煌姚建铨
Owner TIANJIN UNIV
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