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A Ultra-low Concentration Sulfur Dioxide Ultraviolet Differential Feature Extraction Algorithm

A sulfur dioxide and ultraviolet differential technology, which is applied to the measurement of color/spectral characteristics, etc., can solve the problems of non-periodic absorption signals, low-concentration signals cannot be detected, low-concentration signals and noise cannot be distinguished, etc.

Inactive Publication Date: 2021-05-04
TIANJIN UNIV
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Problems solved by technology

[0007] Fast Fourier transform threshold filtering can effectively remove high-frequency noise, but when performing low-concentration measurement, the low-concentration signal cannot be distinguished from the noise, which will result in the inability to detect the low-concentration signal, and is not suitable for the detection of non-periodic absorption signals

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  • A Ultra-low Concentration Sulfur Dioxide Ultraviolet Differential Feature Extraction Algorithm
  • A Ultra-low Concentration Sulfur Dioxide Ultraviolet Differential Feature Extraction Algorithm
  • A Ultra-low Concentration Sulfur Dioxide Ultraviolet Differential Feature Extraction Algorithm

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] In the differential absorbance calculated according to the Lambert-Beer law, different gases have different absorption characteristics in their respective absorption bands. According to SO 2 The absorption features of , extract the eigenvalues ​​in its absorption band. Picture 1-1 and Figure 1-2 SO 2 Flow chart of UV differential feature extraction algorithm and band selection flow chart.

[0040] SO based on Fast Fourier Transformation (FFT) 2 Detection algorithm, the general idea is to use SO 2The periodical characteristics of the differential absorption curve convert the time domain signal to the frequency domain for processing, and use the frequency domain peak value to reflect the gas concentration, so as to solve the problem of inaccurate measurement when the gas concentration is low, the absorption is not obvious, and the high frequency interference...

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Abstract

The invention discloses an ultra-low concentration sulfur dioxide ultraviolet differential feature extraction algorithm, comprising the following steps: collecting spectral data through an ultraviolet differential absorption spectrum analyzer and using it as an original spectrum S; performing band selection and intercepting data on the original spectrum S, and performing n Degree polynomial fitting, resulting polynomial L n Make a difference with the original spectrum S of the selected band to achieve filtering of low-frequency noise L, and the obtained SO 2 Differential absorbance C; (3) using SO 2 The differential absorbance curve has the characteristics of period-like characteristics, and the differential absorbance C is converted into a frequency domain signal P through the fast Fourier transform algorithm; (4) Collect the amplitude of the spectral line on the frequency domain signal P, and record the adjacent The amplitude of the spectral line; (5) A set of multi-dimensional data is composed of multiple data, and the data is reduced by using the principal component analysis algorithm, and the concentration-related eigenvalues ​​are extracted from it. The present invention can realize low concentration SO 2 The detection of gas pollutants has high efficiency and low cost.

Description

technical field [0001] The invention relates to a feature extraction algorithm based on Lambert-Beer law and fast Fourier transform, in particular to an ultra-low concentration sulfur dioxide ultraviolet differential feature extraction algorithm. Background technique [0002] When the light passes through the gas, the gas molecules will absorb the energy of the light source and undergo a transition, which will produce a corresponding absorption spectrum. Due to their different structures, different gas molecules have different absorption characteristics in corresponding wavelength bands. The Lambert-Beer law points out that the change of light intensity before and after the light passes through the gas has a clear relationship with the concentration, thickness and type of the gas to be measured, so the absorption spectrum can be used to measure the gas pollutants (SO 2 , NO, etc.) concentration. [0003] When measuring the concentration of gas pollutants, it is necessary t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/33
CPCG01N21/33
Inventor 王鹏李游孙长库
Owner TIANJIN UNIV
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