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Multi-component substance detection method and device based on wavelength modulation spectrum technology

A technology of wavelength modulation spectrum and detection method, which is applied in the field of detection and can solve problems such as inapplicable detection

Active Publication Date: 2021-08-13
TSINGHUA UNIV
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Problems solved by technology

However, the traditional wavelength modulation spectroscopy technology is not suitable for detecting substances without obvious absorption peaks (that is, broad-spectrum absorption), so there is an urgent need for a multi-component substance detection method that can be used for substances without obvious absorption peaks (that is, broad-spectrum absorption) and device

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  • Multi-component substance detection method and device based on wavelength modulation spectrum technology
  • Multi-component substance detection method and device based on wavelength modulation spectrum technology
  • Multi-component substance detection method and device based on wavelength modulation spectrum technology

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Embodiment Construction

[0049] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0050] For ease of understanding, the basic principles of the wavelength modulation technology are first introduced below.

[0051] The frequency modulation and intensity modulation of light can be expressed as:

[0052] (frequency modulation of light)

[0053] (intensity modulation of light)

[0054] v(t) is the frequency over time, is the center frequency, Δv is the modulation depth, I 0 (t) is the laser intensity, is the center frequency intensity, i 1 is the light intensity linear modulation amplitude, ω is the angular frequency of the modulating signal, and ψ is the phase shift between frequency modulation and light intensity modulation.

[0055] Lambert-Beer's Law:

[0056] I t (t)=I 0 (t)exp[-CLα...

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Abstract

The invention provides a multi-component substance detection method based on a wavelength modulation spectrum technology, the method comprises the following steps: calibrating a detection system by using at least one probe substance with known path integral concentration to obtain a monomial coefficient kwm of a first relational expression of Vm and CwLw; grouping the absorption peaks of the probe material to obtain expressions, so that the expressions among the absorption peak groups are linearly independent from one another; equentially utilizing (n-1) to-be-detected substance calibration detection systems, obtaining a first term coefficient of a second relational expression of CepLep by combining results of the probe substance calibration detection system, measuring the to-be-detected substances through the detection system, obtaining V1, V2, V3... Vn through measurement, and obtaining the path integral concentration CepLep of each to-be-detected substance.

Description

technical field [0001] The present disclosure relates to the field of detection technology, in particular to a multi-component substance detection method and device based on wavelength modulation spectroscopy technology. Background technique [0002] With the rapid development of semiconductor laser technology, tunable semiconductor laser absorption spectroscopy technology has become an important high-sensitivity multi-component material detection method, which is applied in the fields of environmental monitoring, industrial production control and biomedicine. Wavelength Modulation Spectroscopy (WMS) is a branch of Tunable Laser Absorption Spectroscopy (TDLAS), which has many advantages such as high sensitivity, strong selectivity, and high time resolution. When wavelength modulation spectroscopy is used for measurement, the principle of phase-sensitive detection is used to extract the harmonic component of the absorption signal, so as to invert the concentration of substanc...

Claims

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Application Information

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IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/39G01N21/01
Inventor 李绍民孙利群
Owner TSINGHUA UNIV
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