Gas concentration monitoring method based on cavity ring-down spectroscopy technology of kalman filter

A Kalman filter, gas concentration technology, applied in spectrometry/spectrophotometry/monochromator, color/spectral characteristic measurement, optical radiation measurement, etc., can solve the problem of inaccurate analysis results of the device

Inactive Publication Date: 2014-06-25
SHANXI UNIV
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Problems solved by technology

[0015] In order to solve the technical problem that the gas concentration detection method and device analysis results based on cavity ring-down spectroscopy are not accurate enough, the present invention provides a gas concentration monitoring method of cavity ring-down spectroscopy combined with a Kalman filter

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  • Gas concentration monitoring method based on cavity ring-down spectroscopy technology of kalman filter
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  • Gas concentration monitoring method based on cavity ring-down spectroscopy technology of kalman filter

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Embodiment Construction

[0054] A gas concentration monitoring method of cavity ring-down spectroscopy combined with a Kalman filter, a method for collecting data by using a gas concentration monitoring device based on cavity ring-down spectroscopy and a method for analyzing the collected data using a Kalman filter Composition; The gas concentration monitoring device based on cavity ring-down spectroscopy technology includes a laser emitting device, the exit end of the laser emitting device is connected with an acousto-optic modulator 3 through an optical fiber, and the exit optical path of the acousto-optic modulator 3 is set in sequence There is a coupling lens 4 and an optical cavity 5 with an air inlet and an air outlet on the cavity. The two ends of the optical cavity on the optical path are high reflection mirrors and the reflection surfaces of the two high reflection mirrors are opposite, one of which is high The anti-mirror is fixed on the piezoelectric ceramic, and the piezoelectric ceramic is...

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Abstract

The invention belongs to the field of gas detection, and in particular relates to a gas concentration monitoring method based on a cavity ring-down spectroscopy technology of a kalman filter. The gas concentration monitoring method based on the cavity ring-down spectroscopy technology of the kalman filter comprises a method for acquiring data by adopting a gas concentration monitoring device based on the cavity ring-down spectroscopy technology and a method for analyzing the acquired data through the kalman filter, wherein the gas concentration monitoring device based on the cavity ring-down spectroscopy technology comprises a laser emission device; the emission end of the laser emission device is connected with an acoustic optical modulator through an optical fiber; a coupling lens and an optical cavity of which a cavity body is provided with a gas inlet and a gas outlet are arranged on an emission light path of the acoustic optical modulator in sequence; a first photoelectric detector is arranged on the emission light path of the optical cavity. A cavity ring-down signal is subjected to subsequent processing through the kalman filter, so that the system error is reduced, and the accuracy of a cavity ring-down spectrum is improved.

Description

technical field [0001] The invention belongs to the field of gas detection, in particular to a method for monitoring gas concentration using cavity ring-down spectroscopy combined with a Kalman filter. Background technique [0002] As a long-term development technology, gas detection technology is widely used in production and life. As people are more and more concerned about the quality of the air environment, the detection of air pollutants, especially PM2.5, is becoming more and more important. In industry, the detection and control of raw gas and generated gas can greatly improve production efficiency and reduce economic costs, such as NOx in thermal power plants 2 detection. In agriculture, by measuring CO in greenhouses 2 The content can know the growth status of crops, so as to control the addition of different fertilizers. Common gas detection methods include traditional chemical detection methods and new spectral technology detection methods. Traditional chemic...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39G01J3/1256G01J3/28G01J3/42G01N2021/391G01N2021/399
Inventor 赵刚马维光李志新谭巍尹王保贾锁堂
Owner SHANXI UNIV
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