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Method and device for obtaining reference information of methane concentration

A technology of methane concentration and reference information, which is applied in the field of obtaining methane concentration reference information, can solve the problems of instability of the second harmonic and low calculation accuracy of methane concentration, and achieves the effect of improving the accuracy and reducing the influence.

Active Publication Date: 2017-02-15
CCTEG SHENYANG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the absorption of methane leads to the change of the modulation waveform, the second harmonic in the sine wave is extracted, and the second harmonic is compared with the fundamental wave (the ratio is proportional to the methane concentration) for calculation. In the implementation process of this method In the process, it needs to rely on a large number of peripheral circuits of the processor for calculation and processing, and a lot of noise that interferes with the calculation of methane concentration will be generated in the process of signal processing by the peripheral circuit; in addition, the instability of the second harmonic extraction will also lead to the calculation of methane concentration low precision

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  • Method and device for obtaining reference information of methane concentration
  • Method and device for obtaining reference information of methane concentration
  • Method and device for obtaining reference information of methane concentration

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Embodiment 1

[0051] see figure 1 , a methane concentration reference information acquisition method provided by an embodiment of the present invention, comprising: acquiring a plurality of optical signals of different wavelengths passing through a gas chamber containing methane gas and corresponding scanning currents required for generating the plurality of optical signals value, converting the multiple acquired optical signals into multiple corresponding discrete digital electrical signals. In this embodiment, preferably, the obtained multiple optical signals may be firstly converted into multiple analog electrical signals, then the converted multiple analog electrical signals are filtered, and finally the filtered The analog electrical signal is converted into a plurality of corresponding discrete digital signals through the A / D converter.

[0052] The voltage amplitudes of the plurality of digital electrical signals are respectively acquired, and the voltage amplitude of each digital e...

Embodiment 2

[0056] see figure 2 , a methane concentration reference information acquisition method provided by an embodiment of the present invention, a methane concentration reference information acquisition method, applied to a methane concentration information spectral analysis device, comprising:

[0057] The optical signal passing through the gas chamber containing methane gas and the corresponding scanning current value required to generate the optical signal are acquired, and the acquired optical signal is converted into a discrete digital electrical signal corresponding to the optical signal. According to the method of obtaining discrete digital electrical signals from optical signals, this embodiment of the present invention does not limit it. In this embodiment, an A / D converter is used as an example. First, the obtained optical signals can be converted into analog electrical signals, and then Filtering is performed on the converted analog electrical signal, and finally the fil...

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Abstract

The invention provides a methane concentration reference information obtaining method and device and belongs to the field of gas detection. The methane concentration reference information obtaining method comprises the steps of obtaining an optical signal carrying methane concentration information, converting the optical signal into a digital electrical signal, then directly transferring the digital electrical signal to a processor to perform analytical processing so as to obtain methane concentration reference information. In the application process of the method, after the optical signal carrying the methane concentration information is converted into the digital electrical signal, and the digital electrical signal is directly transferred to the processor to perform analytical processing. Therefore, excessive circuits for signal processing are not needed to arranged outside the processor, the influence of noise of peripheral circuits on final data is reduced, and accordingly the problem that an existing methane concentration reference information spectrum processing method excessively relies on the peripheral circuits and noise easily produced by the peripheral circuits interferes final methane concentration computation accuracy is solved.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a method and device for acquiring methane concentration reference information. Background technique [0002] Based on the principle that the light absorption of gas changes with the concentration at its characteristic absorption wavelength, through the analysis of the absorption spectrum of methane gas, a spectral absorption methane concentration detection method is proposed, which uses the second harmonic ratio fundamental wave The method of methane concentration processing, in the modulation process of the laser, then add the modulation of the sine wave. Since the absorption of methane leads to the change of the modulation waveform, the second harmonic in the sine wave is extracted, and the second harmonic is compared with the fundamental wave (the ratio is proportional to the methane concentration) for calculation. In the implementation process of this method In the process, it n...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504G01N21/359
Inventor 宁德义高昊周海坤
Owner CCTEG SHENYANG RES INST