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Terahertz time-domain spectroscopy system and measurement method thereof

A terahertz time-domain and spectral system technology, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve problems such as not reflecting the overall situation

Inactive Publication Date: 2014-08-06
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional focused terahertz time-domain spectroscopy system can only reflect the information of a certain point of the sample, but cannot reflect the overall situation.

Method used

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  • Terahertz time-domain spectroscopy system and measurement method thereof
  • Terahertz time-domain spectroscopy system and measurement method thereof
  • Terahertz time-domain spectroscopy system and measurement method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Wherein, according to the transmission type terahertz time-domain spectroscopy system in Example 1, the measurement of the uniformity of the measurement sample is as follows:

[0052] 1) Use the power meter to measure and select the initial position of the required spot size, fix the position of the translation stage, and fix the actual sample on the translation stage. in, Figure 5 is a schematic diagram of a heterogeneous sample;

[0053] 2) Obtain the terahertz time-domain spectral signal of the non-uniform sample, such as Figure 6 As shown, it is a double peak signal.

[0054] 3) Data processing: compare the terahertz time-domain spectral signal (single-peak signal) of the standard uniform sample with the terahertz time-domain spectral signal (double-peak signal) of the actual sample, and use the data processing software to process the superimposed signal and Differentiate and obtain single-peak time-domain spectra of various materials. According to the peak siz...

Embodiment 2

[0056] Among them, according to the transmission type terahertz time-domain spectroscopy system in Example 1, the detection method for the defect of the measurement sample is as follows:

[0057] 1) Use the power meter to measure and select the initial position of the required spot size, fix the position of the translation stage, fix the reference sample and the actual sample on the translation stage respectively, Figure 7 is a schematic diagram of an actual sample with defects, where the gaps between squares are defects.

[0058] 2) Obtain the terahertz time-domain spectral signals of the reference sample and the actual sample respectively, such as Figure 8 shown.

[0059] 3) Data processing: compare the terahertz time-domain spectral signals of the reference sample and the actual sample, use data processing software to process and distinguish the superimposed signals, and obtain single-peak time-domain spectra of various materials. and peak position change (delay), wheth...

Embodiment 3

[0061] Using the terahertz time-domain spectroscopy system of the present invention, the pore structure of the sample material can be detected, and the porosity of the sample material can be obtained. The main steps are as follows:

[0062] 1. Select the sample material: the sample material used is plastic.

[0063] 2. Prepare standard porosity samples.

[0064] 3. Detection of standard porosity samples: use the transmission terahertz time-domain spectroscopy system of the present invention to detect each standard sample, use the terahertz time-domain waveform of the standard sample as the sample signal, and move the translation stage to improve accuracy , repeat the measurement several times at the center of the particle and pore of each sample, and extract the average value of the two peaks as the final signal.

[0065] 4. Signal processing: the sample signals of different standards are summarized and sorted out. Detection by external standard method: the two peaks of the ...

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Abstract

The invention provides a terahertz time-domain spectroscopy system, comprising a terahertz launcher, a reception detection device and a sample platform, wherein the sample platform comprises a translation table for driving a sample to move away from a focus to a place with the required spot size for measurement. By virtue of a traditional terahertz optical path and the sample platform with the translation table and a rotating table, the terahertz time-domain spectroscopy system can be used for testing defects of some surfaces of samples and the uniformity of the samples and quickly reflecting macroscopic integral information of the samples.

Description

technical field [0001] The invention relates to a terahertz time-domain spectroscopy system, in particular to a terahertz time-domain spectroscopy system for rapidly measuring heterogeneous materials and a measurement method thereof. Background technique [0002] Terahertz technology is a new technology. Terahertz time-domain spectroscopy system (THz-TDS) based on terahertz technology has been applied in chemistry, physics, materials, energy, security and other fields. According to different detection needs, according to the design of its optical path, two systems, parallel and focusing, have been developed, and on this basis, technologies such as two-dimensional scanning imaging have been realized. [0003] However, the traditional focused terahertz time-domain spectroscopy system can only reflect the information of a certain point of the sample, but cannot reflect the overall situation. Contents of the invention [0004] The purpose of the present invention is to overco...

Claims

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Application Information

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IPC IPC(8): G01N21/3586G01N21/3563G01N15/08
Inventor 宝日玛董晨赵昆孟倩王蕊
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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