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Spectral method-based multi-component gas concentration analysis method

A technology of gas concentration and analysis method, which is applied in the direction of material analysis, analysis material, and measuring device through optical means, and can solve problems such as anti-interference error

Active Publication Date: 2018-07-17
BEIJING RES INST OF TELEMETRY +1
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  • Application Information

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Problems solved by technology

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, the present invention provides a multi-component gas concentration analysis method based on the spectrum method, which realizes the absorption spectrum signal by using the least squares method of the asymmetric weighted penalty function Automatic background calculation; by using differential anti-interference wavelength selection algorithm, the problem of water vapor and component anti-interference errors is solved, and the real-time online analysis requirements of high-sensitivity and anti-interference spectral analysis devices are met.

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Embodiment

[0124] Such as figure 2 As shown, the gas measurement device includes a wide-spectrum light source, a gas cell, a detector, and a data acquisition and processing module; the wide-spectrum light source can be an interference light source after Fourier transform of a continuous light source, or an external cavity quantum cascade laser light source . This embodiment uses an 8-10um external cavity quantum cascade laser light source (OEM Mini-100), the detector and gas cell use Gasera PA201, and the data acquisition and processing module is a DSP module based on a linear array CMOS image sensor Perform phase demodulation and data processing. The temperature of the laser shell is stabilized at 25°C, the repetition frequency is set to 1MHz, the duty cycle is 5%, the pulse width is 100ns, and the minimum scanning step wavelength is 0.1cm -1 . The optical power curve uses Thorlabs' S302C pyroelectric probe combined with PM200, and its optical power curve is as follows image 3 sho...

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Abstract

The invention discloses a spectral method-based multi-component gas concentration analysis method. The spectral method-based multi-component gas concentration analysis method comprises the following steps: determining a background gas absorption response spectrum in a wide spectrum range; determining a standard sample absorption response spectrum in the wide spectrum range; determining an absorption response spectrum of to-be-detected mixed gas in a standard sample; determining the concentration value of each component in the to-be-detected mixed gas in the standard sample. Background automatic calculation of an absorption spectrum signal is realized according to an asymmetric reweighted penalty function lease square method; the problem of water vapor and component anti-interference erroris solved by using a differential type anti-interference wavelength selection algorithm, and the real-time on-line analysis requirement of a high-sensitivity and anti-interference spectral analysis device is met.

Description

technical field [0001] The invention relates to a spectroscopic-based multi-component gas concentration analysis method, which is especially suitable for quantitative analysis and calculation in analytical devices with wide spectral ranges such as Fourier transform infrared spectroscopy and photoacoustic spectroscopy, and belongs to the technical field of gas detection. Background technique [0002] Regardless of the Fourier transform infrared spectrometer or the photoacoustic spectrometer, as the wavelength range covered by the scan widens, the number of substances that can cause cross-interference will also increase, so the problem of component anti-interference is more serious. At present, in the quantitative analysis of infrared spectroscopy, the commonly used multivariate correction methods are multiple linear regression (MLR), principal component regression (PCR), partial least squares (PLS), artificial neural network (ANN), support vector machine (SVM) Wait. Principa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504
CPCG01N21/3504
Inventor 周建发王伟魁赵汗青徐暠蒙瑰刘蓓
Owner BEIJING RES INST OF TELEMETRY
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