Gas concentration quantitative calculation method based on nondispersive methane (CH4) gas analysis instrument
A gas analyzer and gas concentration technology, which is applied in the measurement of color/spectral characteristics, etc., can solve the problems of large deviation of gas concentration value, weak increase of absorption rate, and poor linear relationship, and achieve the effect of improving calculation accuracy.
Active Publication Date: 2014-06-18
昆明斯派特光谱科技有限责任公司
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This method is not applicable in the high-concentration section, because in the high-concentration section, the higher the gas concentration, the weaker the increase in the absorption rate, and the linear relationship between the k value and the c value becomes worse. Fitting method in U 1 / U 2 =U 01 / U 02 The gas concentration value calculated by the new empirical equation fitted on the basis of EXP (-kcl) has a large deviation
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[0036] The present invention will be described in detail below with reference to the accompanying drawings and examples.
[0037] Suppose a certain type of non-dispersive CH 4 The gas analyzer adopts a dual optical path design, channel 1 is the test channel, the center wavelength of its narrow band pass filter is 3.35μm, and the half maximum width is 170nm; channel 2 is the reference channel, and the center wavelength of its narrow band pass filter is The wavelength is 3.95 μm, and the half-maximum width is 90 nm.
[0038] A kind of CH based on non-dispersive gas analyzer involved in the present invention 4 Quantitative determination method of gas concentration to be measured, such as figure 1 As shown, the steps of this method are as follows:
[0039] Step 1: Calculate CH according to Beer Lambert's law 4 The formula for calculating the gas concentration is:
[0040] u 1 / U 2 =U 01 / U 02 EXP (-kcl)
[0041] where U 1 is the voltage output value of the test channel ...
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Abstract
The invention belongs to the field of gas concentration measurement. In order to solve the technical problem of greater errors in the CH4 gas concentration calculation in the gas concentration quantitative calculation method by using the nondispersive CH4 gas analysis instrument in the prior art, the invention provides a methane (CH4) gas concentration quantitative calculation method based on a nondispersive CH4 gas analysis instrument. According to the method, the whole test dynamic range is divided into a plurality of concentration sections, each concentration section has the similar gas absorption rate k value, an empirical equation for calculating the concentration c value in different concentration sections is obtained, then, a look-up table method is used for replacing a linear interpolation method to calculate the concentration of gas to be measured, the problem of fluctuation generation of the inherent calculation concentration at the subsection part in the subsection absorption rate linear interpolation method is solved, meanwhile, the high coincidence of the calculation concentration in the whole concentration range is realized, and the CH4 gas concentration calculation precision is effectively improved.
Description
technical field [0001] The invention relates to a non-dispersive CH 4 The invention discloses a gas concentration quantitative determination method for a gas analyzer, which belongs to the field of gas concentration measurement. Background technique [0002] In the gas analyzer, a binary spectral detector placed behind the light source is responsible for converting the energy signal into a voltage signal output, and the voltage signal is linearly proportional to the incident energy. Add a narrowband bandpass filter before each unit of the binary spectrum detector: channel 1 is the measurement channel, and the central wavelength of the narrowband bandpass filter is the characteristic absorption peak of the gas to be measured; channel 2 is the reference channel, The central wavelength of the narrowband bandpass filter is not the characteristic absorption peak of the gas to be measured. Before the photons emitted by the broad-spectrum light source irradiate the narrow-band fi...
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IPC IPC(8): G01N21/25
Inventor 李永辉易宏黄家新
Owner 昆明斯派特光谱科技有限责任公司