Single-pixel terahertz detection system and image acquisition method

A detection system and terahertz technology, applied in the field of terahertz detection, can solve problems such as low imaging resolution, high hardware requirements, and long imaging time, and achieve the effects of improving data collection efficiency, wide practicability, and low hardware requirements

Pending Publication Date: 2020-10-02
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a single-pixel terahertz detection system and image acquisition method, which are used to solve the technical prob

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  • Single-pixel terahertz detection system and image acquisition method
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  • Single-pixel terahertz detection system and image acquisition method

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Embodiment 1

[0056] For ease of understanding, see figure 1 , a single-pixel terahertz detection system provided by the present application, including: a laser source 101, a spatial light modulator 104, a projection lens 105, a terahertz wave source 106, a terahertz wave imaging lens 109, and an optically controlled terahertz wave modulator 110 , a terahertz wave converging lens 111 and a terahertz wave intensity detector 112;

[0057] Further, the laser source 101 is used to generate a laser beam and then enter the spatial light modulator 104;

[0058] Further, the spatial light modulator 104 is used to sequentially load the speckle patterns therein according to the sequence of pre-stored single-pixel speckle patterns, and at the same time, by limiting its relative position with respect to the laser source 101, the incident spatial light The laser beam of the modulator 104 completely covers the speckle pattern, thereby realizing modulation of the laser beam and outputting the modulated l...

Embodiment 2

[0077] For ease of understanding, see figure 2 Embodiment 2 provides a single-pixel terahertz detection image acquisition method, which is based on the single-pixel terahertz detection system in the above-mentioned embodiment 1, including the following steps:

[0078] Step S1: sequentially load the speckle patterns in the spatial light modulator according to the pre-stored speckle pattern sequence;

[0079] It should be noted that the pixel values ​​of the speckle pattern are randomly distributed in [0,1], and several speckle patterns are stored in the hard disk, and the speckle pattern can be read from the hard disk.

[0080] Step S2: emit a laser beam to the spatial light modulator through a laser source and make the laser beam completely cover the preloaded speckle pattern of the spatial light modulator, thereby realizing modulation of the laser beam;

[0081] Step S3: After the laser beam is modulated by the spatial light modulator, output the laser beam to the projectio...

Embodiment 3

[0107] In this embodiment, the single-pixel terahertz detection image acquisition method is described by combining specific implementation data, specifically,

[0108] Step S1: Generate 4000 speckle images of 128×128 pixels by computer, such as image 3 As shown, each speckle image is marked as S j (u, v), j=1, 2, 3...4000, the speckle pattern sequence can be obtained as:

[0109] S j (u,v)=[S 1 (u,v),S 2 (u,v),...,S 4000 (u,v)], (u,v) represents the pixel coordinates, and all the speckle patterns are loaded into the spatial light modulator in turn according to the speckle pattern sequence, and the pre-stored speckle pattern sequence is followed by the spatial light modulator Load the speckle map in it.

[0110] Step S2: emit a laser beam to the spatial light modulator through a laser source and make the laser beam completely cover the preloaded speckle pattern of the spatial light modulator, thereby realizing modulation of the laser beam;

[0111] Step S3: After the la...

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Abstract

The invention discloses a single-pixel terahertz detection system and an image acquisition method. According to the system, a single-pixel speckle pattern is adopted to modulate a terahertz wave beamreflected by a to-be-measured target object to obtain the light field intensity value of the terahertz wave beam corresponding to each single-pixel speckle pattern, so that imaging data can be quicklyobtained, the data acquisition efficiency is greatly improved, the imaging time is shortened, and the requirements on environment and hardware by adopting single-pixel imaging are low. And meanwhile,the strong penetrating power and detection capability of terahertz waves are combined, so that the imaging resolution and detection efficiency of the system are greatly improved, high-quality imagingand detection can be carried out on the surfaces or the interiors of various objects, and the practicability is wide.

Description

technical field [0001] The present application relates to the technical field of terahertz detection, and in particular to a single-pixel terahertz detection system and an image acquisition method using the system. Background technique [0002] In the electromagnetic spectrum, the frequency of terahertz wave is in the range of 0.1-10THz, and the wavelength is between 3μj and 1000μj, which is an electromagnetic wave between microwave and infrared. The harm of terahertz wave radiation to human body is one thousandth of that of X-rays, and it causes almost no harm to human body, so it can be used in the field of security inspection. At present, security checks in public places such as high-speed rail stations and airports usually require two steps: the inspected person first passes through the metal security gate (currently most security gates are based on X-rays), and then his whole body is second-handed by the staff with a hand-held metal detector. scan detection. Different...

Claims

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Application Information

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IPC IPC(8): G01S17/89G01S7/481
CPCG01S7/481G01S17/89
Inventor 吴衡杨鹏陈梅云罗劭娟徐利民程良伦王涛
Owner GUANGDONG UNIV OF TECH
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