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Gas status quantitative analyzer based on extended kalman filter theory

A technology that expands Kalman and gas states, and is applied to thermometers, instruments, and measuring devices that change physically/chemically, and can solve problems such as errors

Inactive Publication Date: 2008-07-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual measured spectrum drifts, stretches or compresses, or H changes due to changes in measurement conditions, so treating H as fixed may cause errors

Method used

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  • Gas status quantitative analyzer based on extended kalman filter theory
  • Gas status quantitative analyzer based on extended kalman filter theory
  • Gas status quantitative analyzer based on extended kalman filter theory

Examples

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Embodiment

[0097] The gas to be measured is oxygen, and the optical path of the laser in the gas chamber is 40cm. The laser beam emitted by the LD laser passes through the gas to be measured in the quartz gas chamber and is received by the sensor. The quartz gas chamber is placed in the constant temperature zone of the heating furnace, and the temperature of the constant temperature zone can be adjusted. The gas temperature in the gas chamber can be measured by thermocouple preparation.

[0098] The laser beam with a continuously changing frequency generated by a tunable diode laser is used to scan the absorption peak of a specific gas. The laser beam enters the central processing unit after passing through the gas to be measured to obtain the corresponding transmittance relationship of each frequency of the laser beam, and the corresponding light is given. Intensity spectral data of the wavelengths are sent to the computer. After the computer obtains the spectral data, the gas concentr...

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Abstract

The invention discloses a gas state quantitative analyzer based on the extended Kalman filtering theory for simultaneous online estimation of concentration and temperature of gas to be detected. The hardware portion is composed of a light source, a receiving system, an optical detection system and a computer, and the software portion is composed of a gas state space model and an extended Kalman filtering portion. Light wave emitted from the light source passes through the gas to be detected and enters the optical detection system through a receiving system, and the optical detection system acquires transmittance corresponding to each wavelength of the light wave and transmits corresponding light intensity spectral data to the computer. The computer constructs a measurement equation based on gas absorption intensity data by gas state analysis software to obtain a gas state equation, thus inversing the concentration and the temperature of the gas by using the extended Kalman filtering algorithm.

Description

technical field [0001] The invention relates to a gas state quantitative analysis device, in particular to a gas state quantitative analyzer based on extended Kalman filter theory and capable of simultaneously estimating gas concentration and temperature. Background technique [0002] Environmental pollution is a worldwide concern. Gas produced by various burners, industrial and commercial boilers, motor vehicle exhaust, and toxic gases from various chemical plants (such as HCl, NH 3 , HF) and other monitoring and forecasting of environmental pollutants is a necessary prerequisite for environmental protection and pollution control. [0003] Traditional gas pollution monitoring is based on wet chemical technology and experimental analysis after absorption sampling. These instruments are usually limited to single-point measurement, and the response time is relatively slow. In contrast, optical and spectroscopic remote sensing technology has become an ideal tool for environme...

Claims

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Application Information

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IPC IPC(8): G01N21/61G01N21/39G01K11/00
Inventor 刘华锋
Owner ZHEJIANG UNIV
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