Gas measurement device having variable volume

Patent metadata

Field	Value
Publication number	US-12281977-B2
Application number	US-202117802306-A
Country	US
Kind code	B2
Filing date	Feb 3, 2021
Priority date	Mar 5, 2020
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

The gas measurement device includes a gas sensor disposed in a gas chamber, a filter configured to control passing gas molecules to the gas chamber, and a driving unit configured to move at least a part of a member defining the gas chamber.

First claim

The invention claimed is:

1. A gas measurement device comprising:
a gas sensor disposed in a gas chamber;
a filter configured to control passing gas molecules to the gas chamber; and
a driving unit configured to move at least a part of a member defining the gas chamber,
wherein the member that defines the gas chamber includes:
an upper portion defining a top surface of the gas chamber and including the filter;
a bottom portion defining a bottom surface of the gas chamber and in which the gas sensor is disposed;
a side wall defining a side surface of the gas chamber and sandwiched between the upper portion and the bottom portion; and
a movable portion that defines a side surface of the gas chamber together with the side wall and is connected to the upper portion, the bottom portion, and the side wall, and
wherein the at least the part of a member that defines the gas chamber and is moved by the driving unit is the movable portion, and
wherein the driving unit moves the movable portion along the top surface, the bottom surface, and the side wall.

2. The gas measurement device according to claim 1 , wherein the movable portion is in close contact with the gas sensor and the filter, and the driving unit moves the movable portion along the gas sensor and the filter.

3. The gas measurement device according to claim 1 , wherein the member that defines the gas chamber includes a valve that is opened when a pressure of the gas chamber is higher than an external pressure and is closed when the pressure of the gas chamber is lower than the external pressure.

4. The gas measurement device according to claim 2 , wherein the member that defines the gas chamber includes a valve that is opened when a pressure of the gas chamber is higher than an external pressure and is closed when the pressure of the gas chamber is lower than the external pressure.

5. The gas measurement device according to claim 1 , wherein the driving unit moves the movable portion to vary volume of the gas chamber.

6. The gas measurement device according to claim 2 , wherein the driving unit moves the movable portion to vary volume of the gas chamber.

7. The gas measurement device according to claim 3 , wherein the driving unit moves the movable portion to vary volume of the gas chamber.

Assignees

• Sintokogio Ltd
• National Univ Corporation Toyohashi Univ Of Technology

Inventors

• Suzuki Yoshihisa
• Noda Toshihiko
• Sawada Kazuaki

Classifications

• G01N2015/1029

  Particle size · CPC title

• G01N2015/1028

  Sorting particles · CPC title

• G01N2291/021

  Gases · CPC title

• G01N29/222

  Constructional or flow details for analysing fluids (optoacoustic fluid cells G01N29/2425) · CPC title

• G01N29/022

  Fluid sensors based on microsensors, e.g. quartz crystal-microbalance [QCM], surface acoustic wave [SAW] devices, tuning forks, cantilevers, flexural plate wave [FPW] devices (microdevices per se B81B) · CPC title