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 T

Method used

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  • Fast terahertz imager with spectral characteristic and its method

Examples

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Example Embodiment

[0015] Example 1

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

[0017] Choose BWOs sold by Microtech, among which the retro-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. Each pixel scans one frequency in the frequency band, one After scanning the 0.70-0.75THz frequency band with a small grid area, the minimum spectral resolution that can be scanned is 20MHz. The output frequency of the BWO and the sample two-dimensional displacement platform are simultaneously controlled by the computer, so that the THz wave of the corresponding frequency is focused on the preset sample position (pixel), and the image carryin...

Example Embodiment

[0018] Example 2

[0019] Detection of methamphetamine (meth) substances: Choose BWOs sold by Microtech, among which the model of the retroreflective tube is QS-260ov84 (the frequency is tunable 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. Perform digital processing on the obtained images, and the spatial resolution can reach 0.5mm. Methamphetamine has a known characteristic peak of 1.2 THz, while other similarly shaped non-banned drugs such as aspirin (the adjacent characteristic peak is around 1.4 THz), powdered sugar (the adjacent characteristic peak is at 1.44 THz), etc., have their spectral peaks Outside of the system's sweep frequency range, the system can effectively detect the ice and give the appear...

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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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