Infrared spectrum high-speed measurement system and method

Abstract

The invention discloses infrared spectrum high-speed measurement system and method, and belongs to the field of infrared spectrum analysis. The measurement system comprises an optical frequency comb source module, an optical module, a detection and data collection module, a data processing module and a control module. The method has a very wide spectral measurement range, wherein measurement timeand spectral resolution are both considered, and the application requirement of time resolution spectral analysis can be satisfied; time-resolved spectral measurement of a terahertz waveband can be realized by replacing an optical frequency comb source of terahertz working waveband, an optical path device, a detector and the like; spectral light splitting is realized without moving parts or tuningprocessing and other means; an optical spectrum scanning mode of a double-frequency comb beat frequency mode is directly adopted, ultra-high resolution spectrum information of a full waveband can beobtained at a time, the advantage of ultra-high measurement speed is achieved, and the measurement speed of a spectrum analysis system adopting the technology is mainly influenced by an electronic detection link and the like.

Description

technical field [0001] The invention belongs to the field of infrared spectrum analysis, in particular to an infrared spectrum high-speed measurement system and method. Background technique [0002] Infrared spectroscopy, also known as molecular vibrational spectroscopy, belongs to molecular absorption spectroscopy. When a beam of continuous wavelength infrared light irradiates a substance, the substance will absorb a part of the light energy to achieve its own rotation or vibration level transition. Different groups require different energy for the transition, so the absorbed waveband is recorded by certain means. Next, the infrared spectrum is obtained. By comparing with the standard spectrum, the quantitative and qualitative analysis of the substance can be realized through the one-to-one correspondence between the functional group and the wavelength. For example, it can be used to study the structure and chemical bonds of molecules, and it can also be used to characteriz...

AI Technical Summary

Problems solved by technology

The third type is the Fourier transform infrared spectroscopy measurement technology using step-scan technology. Through repeated test procedures and repeated measurements to reconstruct the interferogram many times, the measurement process is very cumbersome and complicated, and it is easy to introduce various measurement defects. , The measurement reliability is relatively poor. At present, the AC-coupled Fourier transform infrared spectroscopy measurement technology can achieve the fastest time resolution of 10 nanoseconds, and the DC-coupled Fourier transform infrared spectroscopy measurement technology can achieve the fastest 3 microseconds When using this technique, the spectral resolution is greatly reduced

However, limited by its working principle and light source, the Fourier transform mid-infrared spectrometer has disadvantages such as low time resolution, low signal-to-noise ratio at high spectral resolution, cumbersome measurement process, and extremely error-prone.

This greatly limits the application of Chinese and foreign spectrometers in the disciplines of reaction kinetics, photocatalysis, protein folding, etc.

If the step-scanning method is used to realize the ultra-high-speed infrared spectrum test, the spectral resolution is only 16cm -1 Or lower, it is difficult to reach 0.4cm at low speed measurement -1 and 0.15cm -1 Spectral resolution, which limits a lot of research work

[0005] Therefore, the existing ultra-high infrared spectroscopy measurement technology has problems such as difficulty in taking into account the measurement time and spectral resolution, the measurement range is limited, and the measurement signal-to-noise ratio is low, which limits the ability of chemistry, biology, integrated chip materials, new materials with special functions, etc. The development of research work in the fields of transient process and transient products in the field

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