Arithmetic device, arithmetic method, and gas detection system

Patent metadata

Field	Value
Publication number	US-2022236225-A1
Application number	US-202017605543-A
Country	US
Kind code	A1
Filing date	Apr 17, 2020
Priority date	Apr 22, 2019
Publication date	Jul 28, 2022
Grant date	—

Abstract

[Object] To provide an arithmetic device, an arithmetic method, and a gas detection system that are capable of easily correcting deterioration over time of a detection element.
[Solving Means] The arithmetic device includes a calculation unit. The calculation unit calculates a correction coefficient from a detection element that causes a resonant frequency change by adsorption of gas on the basis of a resonant frequency change amount associated with a humidity change of the detection element in a degraded state and a resonant frequency change amount associated with a humidity change of the detection element in an initial state that was acquired in advance, and corrects the resonant frequency change amount of the detection element in the degraded state by using the correction coefficient.

First claim

1 . An arithmetic device, comprising:
a calculation unit that
calculates a correction coefficient on a basis of a resonant frequency change amount associated with a humidity change of a detection element in a degraded state and a resonant frequency change amount associated with a humidity change of the detection element in an initial state that was acquired in advance, the detection element causing a resonant frequency change by adsorption of gas, and
corrects the resonant frequency change amount of the detection element in the degraded state by using the correction coefficient.

2 . The arithmetic device according to claim 1 , further comprising
a storage unit that stores the resonant frequency change amount associated with the humidity change of the detection element in the initial state.

3 . The arithmetic device according to claim 2 , wherein
the storage unit stores the correction coefficient.

4 . The arithmetic device according to claim 2 ,
wherein the detection element is provided in a plurality, wherein each of the plurality of detection elements includes an oscillator, and an adsorption film that is provided on the oscillator and adsorbs the gas, the plurality of detection elements having different types of the adsorption film, and wherein the storage unit stores the resonant frequency change amount associated with the humidity change of each of the plurality of detection elements in the initial state.

5 . The arithmetic device according to claim 1 , further comprising:
a determination unit that determines a lifetime of the detection element on a basis of a difference between a resonant frequency detected from the detection element in the degraded state to which a zero-point gas has arrived, and a resonant frequency that was detected from the detection element in the initial state to which the zero-point gas has arrived and that was acquired in advance.

6 . An arithmetic method, comprising:
calculating a resonant frequency change amount associated with a humidity change of a detection element in a degraded state, the detection element causing a resonant frequency change by adsorption of gas; calculating a correction coefficient on a basis of the resonant frequency change amount associated with the humidity change of the detection element in the degraded state and a resonant frequency change amount associated with a humidity change of the detection element in an initial state that was acquired in advance; and correcting the resonant frequency change amount of the detection element in the degraded state by using the correction coefficient.

7 . The arithmetic method according to claim 6 , wherein the resonant frequency change amount associated with the humidity change of the detection element is calculated on a basis of the resonant frequencies detected by the detection element for a zero-point gas and for a gas having a humidity different from a humidity of the zero-point gas.

8 . The arithmetic method according to claim 7 , wherein the zero-point gas is a dehumidified and deodorized gas.

9 . The arithmetic method according to claim 7 , further comprising determining a lifetime of the detection element on a basis of a difference between the resonant frequency detected from the detection element in the degraded state to which the zero-point gas has arrived, and the resonant frequency detected from the detection element in the initial state to which the zero-point gas has arrived that was acquired in advance.

10 . A gas detection system, comprising:
a gas sensor including a detection element that causes a resonant frequency change by adsorption of gas; and an arithmetic device including
a calculation unit that calculates a correction coefficient on a basis of a resonant frequency change amount associated with a humidity change of the detection element in a degraded state and a resonant frequency change amount associated with a humidity change of the detection element in an initial state that was acquired in advance, and that corrects the resonant frequency change amount of the detection element in the degraded state by using the correction coefficient.

11 . The gas detection system according to claim 10 , wherein
the gas sensor includes:
a first flow path that includes a dehumidification and deodorization filter disposed therein and that guides a detection target gas having passed through the dehumidification and deodorization filter to the detection element,
a second flow path that includes a deodorization filter disposed therein and that guides the detection target gas having passed through the deodorization filter to the detection element, and
a third flow path that directly guides the detection target gas to the detection element.

Assignees

• Taiyo Yuden Kk

Inventors

• Hattori Masashi
• Shimomai Kenichi
• Onda Yosuke

Classifications

• G01N2291/106

  one or more transducer arrays · CPC title

• G01N2291/0256

  Adsorption, desorption, surface mass change, e.g. on biosensors · CPC title

• G01N2291/0215

  Mixtures of three or more gases, e.g. air · CPC title

• G01N2291/014

  Resonance or resonant frequency · CPC title

• G01N29/4463

  Signal correction, e.g. distance amplitude correction [DAC], distance gain size [DGS], noise filtering · CPC title