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Fast terahertz imager with spectral characteristic and its method

An imaging device and imaging method technology, applied in the field of terahertz wave applications, to achieve the effects of fast object recognition, high spatial resolution and spectral resolution, and fast imaging speed

Inactive Publication Date: 2007-04-04
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current application of BWO is either for spectrum analysis or imaging detection, and the combination of THz spectrum analysis and spatial imaging can quickly obtain THz images with spectral characteristics to judge the shape of objects and detect specific chemical substances. , there is no such fast and effective technology at home and abroad

Method used

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  • Fast terahertz imager with spectral characteristic and its method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Detection of substances containing cyclone explosives (trimethyltrinitroamine explosives):

[0017] Choose the BWOs sold by Microtech, where the return wave tube model is selected as QS-400ov81 (the frequency is tunable in the 0.6-0.9THz frequency band), and the computer controls the BWO output wave to change in the 0.70-0.75THz frequency band. If you need to scan an object with a size of 0.5m×0.5m, first preset the computer to divide the scanning space into 50×50 grids, each small grid is divided into 50×50 pixels, and each pixel scans a frequency in the frequency band, a After scanning the 0.70-0.75THz frequency band in the small grid area, the minimum spectral resolution of the scan can be obtained as 20MHz. The output frequency of BWO and the two-dimensional displacement platform of the sample are simultaneously controlled by the computer, so that the THz wave of the corresponding frequency is focused on the preset sample position (pixel point), and the image carryi...

Embodiment 2

[0019] Detection of methamphetamine (ice poison) substances: choose BWOs sold by Microtech, where the return wave tube model is selected as QS-260ov84 (frequency can be tuned in the 1.0-1.25THz frequency band), and the computer-controlled BWO output wave is in the 1.17-1.22THz frequency band Change. For example, when scanning mail items with a size of 0.2m×0.2m, the scanning space is divided into 40×40 grids, each small grid is divided into 10×10 pixels, and the spectral resolution is 500MHz. The obtained image is digitally processed, and the spatial resolution can reach 0.5mm. Methamphetamine has a known characteristic peak at 1.2THz, while other non-banned drugs with similar shapes such as aspirin (the adjacent characteristic peak is around 1.4THz), sugar powder (the adjacent characteristic peak is at 1.44THz), etc., their spectral peaks It is outside the scanning range of the system, so the system can effectively detect methamphetamine, and at the same time give the shape ...

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Abstract

A terahertz quickly imaging method of object to be tested includes dividing scan space to be a numbers of sub regions averagely in advance and then dividing each sub region to be a numbers of pixel points averagely, carrying out coding on pixel in each sub region by utilizing different TH2 wave frequency and suing TH2 wave to scan object to be tested as per set frequency code for obtaining TH2 image with spectrum character of object to be tested. The device used for obtaining TH2 image with spectrum character of object to be tested is also disclosed.

Description

technical field [0001] The invention belongs to the technical field of terahertz wave applications, and in particular relates to a terahertz fast imaging device with spectral characteristics and a method thereof. Background technique [0002] Terahertz (THz, 1THz=1012Hz) radiation usually refers to electromagnetic radiation waves with a frequency range from 0.1THz to 10THz. It occupies a very special position in the electromagnetic spectrum and has a series of special properties and important academic and application values. This band is located at the junction of electronics and optics. Compared with electromagnetic waves in other bands, THz electromagnetic waves have the following characteristics: (1) The wavelength of THz waves is between millimeter waves and infrared light, and it can penetrate deep into many organic materials. It does not harm materials, which makes terahertz imaging very suitable for biological sample detection and security detection. (2) The THz band...

Claims

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Application Information

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IPC IPC(8): G01N23/04
Inventor 汪伟何金龙洪治
Owner CHINA JILIANG UNIV
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