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Gas metering monitoring device and monitoring method

A gas measurement and monitoring device technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of low measurement and monitoring accuracy, and achieve the effects of high stability, high reliability and improved accuracy

Inactive Publication Date: 2010-12-15
BEIJING DEFINE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the research on the prior art, the inventors found that in this gas metering and monitoring scheme using infrared spectroscopy technology, because infrared rays are easily interfered by other factors such as water vapor and dust in the sample gas, the accuracy of metering and monitoring is relatively low. Low

Method used

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  • Gas metering monitoring device and monitoring method

Examples

Experimental program
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Effect test

Embodiment 1

[0059] figure 1 A schematic structural diagram of a gas detection device provided in Embodiment 1 of the present invention, the device includes:

[0060] Laser 101 , signal detector 102 , laser control module 103 , signal processing module 104 , data analysis module 105 and sample chamber 106 .

[0061] The laser control module 103 is connected to the laser 101 and is used to drive the laser 101 to emit a laser with a specific wavelength to the sample gas in the sample chamber 106 .

[0062] The laser 101 may be a tunable diode laser, specifically: a semiconductor distributed feedback laser or a semiconductor vertical cavity surface emitting laser.

[0063] A sample gas is passed into the sample chamber 106 . The sample chamber 106 can be a single sample chamber or a multiple reflection sample chamber, and the multiple reflection sample chamber can specifically be a double reflection sample chamber, a Herriott type or a White type multiple reflection sample chamber. The mul...

Embodiment 2

[0112] see image 3 As shown, it is a schematic flow chart of the gas metering monitoring method provided in this embodiment, and the method specifically includes the following steps:

[0113] S301, emitting a specific laser beam to the sample chamber;

[0114] S302, receiving a transmission signal through the sample gas in the sample chamber;

[0115] S303, converting the transmission signal into an absorption spectrum of the gas to be measured;

[0116] S304, analyzing the absorption spectrum of the gas to be measured to obtain information about the gas to be measured.

[0117] Wherein, the conversion of the transmission signal into the absorption spectrum of the gas to be measured may specifically include:

[0118] converting the transmitted signal from an optical signal to an electrical signal;

[0119] The transmission signal is amplified, and the amplified transmission signal is demodulated to obtain the absorption spectrum of the gas to be measured.

[0120] As for...

Embodiment 3

[0123] Referring to the figure, it is a schematic flow chart of the gas metering and monitoring method provided in this embodiment. The method specifically includes the following steps:

[0124] S401, superimposing the low-frequency sawtooth wave and high-frequency sine wave to drive the laser to emit a specific laser beam to the sample chamber;

[0125] S402. Obtain a transmission signal containing high-frequency information passing through the gas to be measured in the sample chamber;

[0126] S403, converting the transmission signal into an absorption spectrum of the gas to be measured;

[0127] S404, acquiring the double frequency signal curve in the absorption spectrum line;

[0128] S405, analyzing the peak value of the double frequency signal to obtain the information of the gas to be measured.

[0129] Wherein, in order to make the obtained gas information to be measured more accurate, before analyzing the peak value of the frequency-doubling signal to obtain the inf...

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Abstract

The invention discloses gas metering monitoring device and monitoring method. The device comprises a laser, a signal detector, a laser control module, a signal processing module, a data analysis module and a sample room, wherein the laser control module is connected with the laser and is used for driving the laser to transmit laser light with a specified wavelength to a sample gas in the sample room; the signal detector is used for acquiring a transmission signal passing through the sample gas in the sample room and sending the transmission signal to the signal processing module; the signal processing module is used for converting the transmission signal into the absorption spectrum of gas to be tested; and the data analysis module is used for analyzing the absorption spectrum of the gas to be tested to obtain the information of the gas to be tested. The metering monitoring scheme can not be influenced by moisture, dust and other factors and can increase the metering monitoring accuracy of the gas to be tested.

Description

Technical field: [0001] The invention relates to the field of environmental monitoring, in particular to a gas metering monitoring device and a monitoring method. Background technique: [0002] Under the CDM (Clean Development Mechanism) agreed in the "Kyoto Protocol", developed countries can invest in developing countries to obtain greenhouse emission reductions at a lower cost than domestic costs. "The emission reduction targets promised in ", but also conducive to the promotion of sustainable socio-economic development in developing countries. The accuracy of data measurement of CDM projects is very important, especially the measurement and monitoring of gases related to greenhouse gases (methane, carbon dioxide, etc.), which is the key to the quality assurance of CDM projects. All CDM projects must conduct post-mortem monitoring in accordance with the established monitoring plan, and the United Nations Executive Council will issue the certified emission reductions gener...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N21/35G01N21/39
Inventor 周欣
Owner BEIJING DEFINE TECH
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