A Quantitative Analysis Method of Terahertz Spectroscopy Based on Scattering Analogy

Abstract

The invention relates to a terahertz spectrum quantitative analysis method based on scattering analogy, and belongs to the technical field of terahertz spectrum application. The present invention performs terahertz time-domain spectrum detection on three pure polyethylene (PE) tablet samples with different concentrations, obtains their terahertz absorption spectra and performs average calculation, and uses the average calculated PE terahertz absorption spectra to characterize the scattering effect ; Obtain the terahertz absorption spectrum of the mixture sample and the simple substances in the mixture respectively; the terahertz absorption spectrum of the sample measured in the experiment is actually composed of two parts: the absorption of the terahertz wave by the sample itself and the attenuation caused by the scattering effect. Establish the terahertz absorption spectrum model of the mixture sample measured in the experiment; establish the relationship between the terahertz absorption spectrum of the mixture sample, the terahertz absorption spectrum of each component in the mixture and the PE terahertz absorption spectrum based on the principle of analog scattering; use The least square algorithm calculates the concentration of each component in the mixture.

Description

technical field [0001] The invention relates to a terahertz spectrum quantitative analysis method based on scattering analogy, and belongs to the technical field of terahertz spectrum application. Background technique [0002] In recent years, with the development of ultrafast laser technology, a series of effective methods have been provided for the generation and detection of terahertz waves. Terahertz (THz, 1THz=10 12 Hz) waves, as a band in the electromagnetic spectrum, have not been deeply developed and utilized for a long time due to the lack of effective sources and detection devices, so that they have been called "terahertz gap" for a long time. Due to the unique characteristics of terahertz waves, it has shown great potential in many fields, such as material identification, medicine, security inspection, and astronomical observation. Among them, quantitative analysis based on terahertz absorption spectrum is one of the most important application directions of tera...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a terahertz spectral quantitative analysis method based on scattering analogy, so as to solve the problem that only the absorption of the sample itself is considered in the current terahertz spectral quantitative analysis, and the scattering effect is ignored, which leads to the problem of quantitative analysis. Technical issues with less accurate results

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