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Non-dispersive infrared absorption spectrum calibration method for measuring CO content in SF6 gas

A non-dispersive infrared and absorption spectrum technology, which is applied in the field of non-dispersive infrared absorption spectrum calibration for the determination of CO content in SF6 gas, can solve the problems of inability to guarantee practicability and reliability, and achieve the effect of improving detection accuracy.

Pending Publication Date: 2020-09-22
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for measuring SF 6 The non-dispersive infrared absorption spectrum calibration method of CO content in gas is used to solve the technical problems such as the initial calibration and inversion of sensors in the prior art, which cannot guarantee the practicability and reliability of use.

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  • Non-dispersive infrared absorption spectrum calibration method for measuring CO content in SF6 gas

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Embodiment Construction

[0033] The realization principle of the present invention: various substances have different absorption degrees of infrared radiation of different wavelengths, so when infrared radiation of different wavelengths is irradiated to the sample material in sequence, the radiation energy of certain wavelengths is selectively absorbed by the sample and weakened , thus forming a characteristic absorption. Its absorption relationship obeys Lambert-Beer (Lambert-Beer) absorption law. Assuming that the incident light is parallel light, the same incident light can be directly measured to a certain value, and its intensity is I 0 , the intensity of the outgoing light is I, and the measured optical path length of the gas medium is L.

[0034] When the light intensity caused by the absorption of the molecular number dN in the gas medium is reduced to dI, according to the Lambert-Beer absorption law:

[0035] dI / I=-KdN

[0036] In the formula, K is a constant of proportionality, which can ...

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Abstract

The invention discloses a non-dispersive infrared absorption spectrum calibration method for measuring CO content in SF6 gas. The method comprises the following steps: step 1, installing an optical filter for analyzing gas absorption wavelength in front of the detection end of a sensor; step 2, the infrared light source is subjected to GFC signal modulation to obtain a reference light beam and a measurement light beam, and the reference light beam and the measurement light beam sequentially enter a third gas absorption cell; step 3, the reference light beam and the measurement light beam are absorbed by standard gas in a third gas absorption cell in sequence and then are received by an infrared detector through an optical filter; step 4, obtaining a difference voltage between the referencesignal and the measurement signal through the reference signal and the measurement signal received by the infrared detector; and step 5, completing CO infrared calibration through the concentration and the difference voltage of the standard gas; the technical problems that in the prior art, initial calibration and inversion are conducted on the sensor, and use practicability and reliability cannot be guaranteed are solved.

Description

technical field [0001] The invention belongs to gas detection technology, in particular to a method for measuring SF 6 Calibration method of CO content in gas by non-dispersive infrared absorption spectroscopy. Background technique [0002] Power industry SF 6 The equipment is widely used, and SF can be detected according to the gas composition 6 Latent faults inside equipment, especially those involving internal insulating materials, can be characterized by CO content. However, due to the infrared region SF 6 The fault characteristic gas components present in the equipment contain SO 2 、H 2 0.CO 2 , SO 2 f 2 、SOF 2 、CF 4 etc. Economical and accurate detection of SF in the infrared region where a large number of gas components exist 6 The content of CO in gas components is a difficult problem. Some literatures have reported the detection of SF by tunable laser infrared absorption spectroscopy. 6 CO content in gas, tunable laser infrared absorption spectroscopy to...

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Application Information

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IPC IPC(8): G01N21/3504
CPCG01N21/3504G01N2021/3509
Inventor 张英牧灏余鹏程郭思琪刘喆
Owner GUIZHOU POWER GRID CO LTD
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