Infrared spectrum high-speed measurement system and method

An infrared spectrum and measurement system technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of low time resolution, poor measurement reliability, and cumbersome measurement process of infrared spectrometers, and achieve the effect of wide spectral measurement range and meeting application requirements

Inactive Publication Date: 2019-12-10
CHINA ELECTRONIS TECH INSTR CO LTD
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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

Method used

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Embodiment 1

[0056] Such as figure 1 As shown, an infrared spectrum high-speed measurement system includes 1-optical frequency comb source module; 2-optical module; 3-detection and data acquisition module; 4-data processing module; 5-control module.

[0057] Optical frequency comb source module 1, including 101-light source comb and 102-local oscillator comb, needs to consider the following factors:

[0058] (1) There is a small frequency difference Δf between the local oscillator comb and the light source comb, and the frequency difference Δf is much smaller than the repetition frequency of the local oscillator comb and the light source comb;

[0059] (2) The local oscillator comb and light source comb used in the present invention adopt the optical frequency comb in the mid-infrared band generated by the broadband quantum cascade laser using the four-wave mixing effect as a phase-locking mechanism. The principle is as follows: the broadband of InGaAs / InAlAs structure is adopted Quantum ...

Embodiment 2

[0068] On the basis of above-mentioned embodiment 1, the present invention proposes a kind of infrared spectrum high-speed measurement method, comprises the following steps:

[0069] Step 1: Two optical frequency combs with a frequency difference Δf are used, one of which is used as a local oscillator comb, and the other optical frequency comb is used as a light source comb for measurement;

[0070] Step 2: The output signals of the local oscillator comb and the light source comb are processed by optical elements such as collimation, beam splitting, and beam combining to generate two identical multi-heterodyne beat-frequency lights, and let one multi-heterodyne beat-frequency light be used as The measurement light passes through the sample to be tested, and the other multi-heterodyne beat frequency light is used as a reference light without passing through the sample to be tested, and enters the corresponding detection link respectively;

[0071] Step 3: One channel of measure...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/35
CPCG01N21/35
Inventor 刘加庆刘磊项国庆吴威刘雷王建国韩顺利李志增陈晓峰
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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