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Oxygen concentration measurement method and system

A technology of oxygen concentration and measurement method, applied in the direction of analyzing materials, instruments, etc., can solve the problems of non-vibration resistance and high power consumption, and achieve the effect of improving the anti-vibration performance, reducing the power consumption of the circuit, and eliminating the influence.

Pending Publication Date: 2019-01-29
SHENZHEN UNIV
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose an oxygen measurement method and system to avoid the problems of non-vibration resistance, high power consumption and zero drift in the prior art paramagnetic oxygen measurement system

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Embodiment Construction

[0022] The content of the invention will be further described below in conjunction with the accompanying drawings.

[0023] Such as figure 1 The oxygen concentration measurement system involved in the preferred embodiment shown includes a measurement gas path 100 for the measured gas to flow through, a reference gas path 200 for the reference gas to flow through, a differential pressure sensor 300 and a pressure sensor for providing An electromagnetic element 500 with a changing magnetic field; the differential pressure sensor 300 is connected between the measuring gas circuit 100 and the reference gas circuit 200, so that the two pressure sensing ends of the differential pressure sensor 300 are respectively connected to the measuring gas circuit 100 and the reference gas circuit 200 Unicom, used to measure the gas path pressure difference between the measuring gas path 100 and the reference gas path 200; the measuring gas path 100 and the reference gas path 200 merge at the m...

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Abstract

Disclosed are an oxygen concentration measurement method and system based on paramagnetic properties of oxygen molecules, The system includes a measurement gas path, a reference gas path, a measurement gas chamber, a pressure difference sensor, and an electromagnetic component used for providing a changing magnetic field. The changing magnetic field acts on the measurement chamber. The measurementgas chamber communicates with the measurement gas path and the reference gas path. Two pressure sensing ends of the pressure difference sensor communicate with the measurement gas path and the reference gas path to measure a gas path difference between the two gas paths. Due to the paramagnetic properties of oxygen, under the action of the changing magnetic yield on the measurement gas chamber, the gas path difference is generated between the two ends of the pressure difference sensor. A gas path pressure difference signal contains oxygen concentration information of measured gas, is modulated on a wave carrier frequency of an excitation current signal frequency of the electromagnetic element, is amplified by an analog circuit, and then is demodulated and analog-to-converted to obtain a digital oxygen concentration signal. The oxygen concentration measurement method and system designed by the invention have the advantages of good anti-vibration performance, low power consumption, zerodrift resistance, accurate measurement and good robustness.

Description

technical field [0001] The invention relates to an oxygen concentration measurement method and system, in particular to an oxygen concentration measurement method and system utilizing the paramagnetic properties of oxygen molecules. Background technique [0002] Oxygen concentration monitoring is one of the indispensable key monitoring indicators in modern clinical operations and related treatments, food processing, chemical industry, automobiles and other fields. Oxygen concentration analyzers are usually divided into different categories according to their working principles and application ranges. Including paramagnetic oxygen analyzer, electrochemical oxygen analyzer and laser oxygen analyzer. [0003] In the prior art, the electrochemical oxygen analyzer using zirconia uses the electrochemical reaction of zirconia to generate a current proportional to the concentration after encountering oxygen, so as to realize the measurement of oxygen concentration; however, the el...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00
CPCG01N7/00
Inventor 叶继伦张旭叶南亭郑盛坤
Owner SHENZHEN UNIV
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