A Method for Simultaneously and Accurately Measuring the Concentration of Multiple Gases
A technology for accurate measurement of gas concentration, applied in measurement devices, color/spectral characteristic measurement, instruments, etc., can solve the problem that gas concentration cannot be measured at the same time, and achieve the effect of eliminating interference factors, ensuring accuracy, and ensuring stability
Active Publication Date: 2020-09-11
HEILONGJIANG INST OF TECH
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[0004]
In order to solve the technical problem that the existing gas concentration cannot be measured at the same time, the present invention
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[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0023] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0024] like figure 1 As shown, a method for synchronously and accurately measuring the concentration of multiple gases includes the following steps:
[0025] A fiber laser 1 with a spectral line width of 0.1nm outputs 1064nm linearly polarized laser light, which is divided into two beams of pumping li...
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The invention relates to a method for synchronously and accurately measuring concentrations of various gases. The method comprises the following steps: emitting one beam of pump light into a first resonant cavity to form first detection laser; emitting the other beam of pump light into a second resonant cavity to form second detection laser; directly transmitting the first detection laser and thesecond detection laser to a sample tank (22); after reflecting the first detection laser and the second detection laser in the sample tank (22) for a plurality of times, emitting the laser out from alight outgoing opening (23) of the sample tank (22); then converging the laser into an absorption spectrograph (25) through an adjustable converging lens (24); transforming a received light signal into an electric signal through the spectrograph (25) and transmitting the electric signal to a computer (26); analyzing and calculating by the computer (26) to obtain a measured value N1 of the first detection laser and a measured value N2 of the second detection laser, and acquiring an accurate gas concentration value N. According to the method provided by the invention, double wavelengths are usedfor measuring and are mutually used as reference standards to carry out pulse width correction, and an accurate measurement result is obtained; the detection of the various gases under high precisionis met.
Description
technical field [0001] The invention relates to a method for detecting the concentrations of multiple gases, in particular to a method for synchronously and accurately measuring the concentrations of multiple gases. Background technique [0002] Industry and commerce usually require accurate measurement of harmful gases in a certain space to ensure the safety of this space. Currently, harmful gases that need to be protected include SO 2 、H 2 S, CO, etc. Whether the claimed hazardous gases meet certain purity limits and / or whether the emissions of these gases comply with environmental regulations. Typical applications such as process control, emissions and environmental monitoring, security, and air conditioning require accurate concentration measurement. [0003] Wavelength modulation spectroscopy is a way to enhance the sensitivity of gas measurements, especially when measuring smaller concentrations. Usually, the concentration of the gas to be measured is calculated b...
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IPC IPC(8): G01N21/39
CPCG01N21/39G01N2021/391
Inventor 杨曦凝李林军许聪谢文强申英杰
Owner HEILONGJIANG INST OF TECH