Gas measurement device and gas measurement method

Patent metadata

Field	Value
Publication number	US-12379297-B2
Application number	US-202117802244-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Mar 5, 2020
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

The gas measurement device includes a filter having a plurality of openings, each opening being variable in size, an adjustment mechanism configured to vary size of the plurality of openings, a first gas sensor configured to detect gas molecules passing through an opening of the filter and output a first measurement value corresponding to the detected gas molecules, and a second gas sensor configured to detect the gas molecules passing through the opening of the filter, output a second measurement value corresponding to the detected gas molecules, and detect gas molecules of a gas species different from the gas molecules detected by the second gas sensor.

First claim

The invention claimed is:

1. A gas measurement device comprising:
a filter having a plurality of openings, each opening being variable in size;
an adjustment mechanism configured to vary size of the plurality of openings;
a first gas sensor configured to detect gas molecules passing through the plurality of openings of the filter and output a first measurement value corresponding to the detected gas molecules; and
a second gas sensor configured to detect the gas molecules passing through the plurality of openings of the filter, output a second measurement value corresponding to the detected gas molecules, and detect gas molecules of a gas species different from the gas molecules detected by the first gas sensor,
wherein the filter includes a first member and a second member disposed so as to overlap the first member,
the first member includes first member holes,
the second member includes second member holes,
the plurality of openings is formed by overlapping of the first member holes and the second member holes,
the first member and the second member are movable relative to each other, and
the adjustment mechanism moves at least one of the first member and the second member in a direction perpendicular to an overlapping direction to vary the size of the plurality of openings.

2. The gas measurement device according to claim 1 , wherein the filter is formed of a plate-shaped elastic member, and the adjustment mechanism elastically deforms the filter to vary the size of the plurality of openings.

3. The gas measurement device according to claim 1 , wherein the filter is formed of a porous material expanding or contracting depending on temperature, and the adjustment mechanism varies a temperature of the filter to vary the size of the plurality of openings.

4. The gas measurement device according to claim 1 , comprising:
a signal generation unit configured to output a synchronous signal;
a control unit configured to control the adjustment mechanism based on a control signal for determining sizes of the plurality of openings and the synchronous signal;
an acquirement unit configured to acquire the first measurement value and the second measurement value based on the synchronous signal; and
an output unit configured to output both the first measurement value and the second measurement value, and the control signal in association with each other.

5. The gas measurement device according to claim 4 , comprising a determination unit configured to determine the gas species based on a pre-acquired relationship, the first measurement value, the second measurement value, and the control signal output by the output unit,
wherein the pre-acquired relationship is a relationship between the gas species, the first measurement value, the second measurement value, and the control signal.

6. A gas measurement method comprising:
varying sizes of a plurality of openings included in a filter based on a control signal for determining sizes of the plurality of openings and a synchronous signal;
detecting gas molecules passing through the plurality of openings by a first gas sensor and a second gas sensor capable of detecting the gas molecules different from the first gas sensor;
acquiring a first measurement value output by the first gas sensor and a second measurement value output by the second gas sensor in synchronization with the synchronous signal; and
determining a gas species based on a pre-acquired relationship, the acquired first measurement value, the acquired second measurement value, and the acquired control signal, wherein the pre-acquired relationship is a relationship between the gas species, the first measurement value, the second measurement value, and the control signal,
wherein the filter includes a first member and a second member disposed so as to overlap the first member,
the first member includes first member holes,
the second member includes second member holes,
the plurality of openings is formed by overlapping of the first member holes and the second member holes,
the first member and the second member are movable relative to each other, and
the varying includes moving at least one of the first member and the second member in a direction perpendicular to an overlapping direction to vary the size of the plurality of openings.

Assignees

• Sintokogio Ltd
• National Univ Corporation Toyohashi Univ Of Technology

Inventors

• Suzuki Yoshihisa
• Noda Toshihiko
• Sawada Kazuaki

Classifications

• G01N2015/0662

  Comparing before/after passage through filter · CPC title

• B01D2275/302

  Means for changing the porosity of a filter element, e.g. adjustment of a slit width, compression of a foam material · CPC title

• B01D2275/203

  Shapes flexible in their geometry, e.g. bendable, adjustable to a certain size · CPC title

• B01D46/10

  Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces · CPC title

• G01N1/2205

  with filters · CPC title