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Gas sensor

A gas sensor and gas technology, applied in the structural details of gas analyzers, analyzing gas mixtures, instruments, etc., can solve problems such as measurement value errors

Active Publication Date: 2020-05-15
TDK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The gas sensor detects the concentration of the gas to be measured contained in the atmosphere, but errors may occur in measured values ​​due to gases different from the gas to be measured contained in the atmosphere

Method used

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Embodiment Construction

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

[0038] figure 1 It is a circuit diagram showing the configuration of the gas sensor 10A according to the first embodiment of the present invention.

[0039] like figure 1 As shown, the gas sensor 10A of the present embodiment includes a sensor unit S and a signal processing circuit 20 . Although not particularly limited, the gas sensor 10A of the present embodiment detects CO in the atmosphere 2 As for the gas concentration, as will be described later, measurement errors due to humidity can be eliminated by hardware. In this specification, the gas to be detected may be referred to as "first gas", and the gas that is noise may be referred to as "second gas". For this embodiment, the first gas is CO 2 gas, the second gas is water vapour.

[0040] The sensor unit S is used to detect CO as the detection target gas 2 A heat conduction type gas sens...

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Abstract

[Problem] To measure the concentration of a gas to be detected while eliminating the influence of a different gas from the gas to be detected. [Solution] The present invention comprises a first thermistor Rd1 that has a resistance that changes with a first sensitivity according to the concentration of a first gas and changes with a second sensitivity according to the concentration of a second gas,a second thermistor Rd2 that is connected in series to the first thermistor and has a resistance that changes with a third sensitivity according to the concentration of the first gas and changes witha fourth sensitivity according to the concentration of the second gas, and a correction resistor R1 that is connected in parallel with the first or second thermistor. In the present invention, the first and second thermistors are connected in series and the potential change according to the concentration of the second gas at the point of connection between the first thermistor and second thermistor is cancelled by the correction resistor, so it is possible, without involving computation processing, to simply and highly accurately remove the influence of the second gas and accurately calculatethe concentration of the first gas.

Description

technical field [0001] The present invention relates to a gas sensor that detects a gas contained in an atmosphere, and more particularly, to a gas sensor that can eliminate the influence of a gas other than a gas to be detected. Background technique [0002] A gas sensor detects the concentration of a gas to be measured contained in the atmosphere, but errors may occur in measured values ​​due to gases different from the gas to be measured contained in the atmosphere. Patent Document 1 discloses a method of providing an oxygen concentration measuring unit or a humidity measuring unit separately from a hydrogen sensor unit that detects hydrogen gas to be detected, and correcting a signal obtained from the hydrogen sensor unit based on the oxygen concentration or humidity. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2011-133401 Contents of the invention [0006] The problem to be solved by the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/18
CPCG01N27/124G01N27/125G01N33/004G01N33/006G01N27/18G01N33/0031G01N27/122
Inventor 海田佳生松尾裕
Owner TDK CORP
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