US 12,092,563 B2
Sensor and electric device with the sensor
Raizo Maeda, Tokyo (JP); Tetsuo Tanaka, Tokyo (JP); and Osamu Mizuno, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/566,664
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Jun. 9, 2021, PCT No. PCT/JP2021/021924
§ 371(c)(1), (2) Date Dec. 4, 2023,
PCT Pub. No. WO2022/259423, PCT Pub. Date Dec. 15, 2022.
Prior Publication US 2024/0264070 A1, Aug. 8, 2024
Int. Cl. G01N 17/00 (2006.01); G01N 17/02 (2006.01); G01N 17/04 (2006.01); G01N 33/00 (2006.01)
CPC G01N 17/04 (2013.01) [G01N 17/006 (2013.01); G01N 17/02 (2013.01); G01N 33/0027 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A sensor to identify a type of a corrosive gas present in an environment, the type of the corrosive gas at least including a first type and a second type, the sensor comprising:
a sensor body comprising at least three structures;
a measurer to measure a resistance value of each of the at least three structures or a resistance value of the sensor body;
an analyzer to identify the type of the corrosive gas present in the environment based on the resistance value measured by the measurer and corrosion resistance information that represents a magnitude relation in corrosion resistance between the at least three structures for each environment; and
a notification device to notify a content identified by the analyzer,
the at least three structures comprising:
a first structure comprising a thin film including a first metallic material, the thin film being exposed in the environment;
a second structure comprising a thin film including a second metallic material that differs from the first metallic material, the thin film being exposed in the environment; and
a third structure comprising a thin film including the second metallic material, a surface of the thin film exposed in the environment being covered with a coating material,
the corrosive gas of the first type and the corrosive gas of the second type each causing corrosion of the first metallic material and the second metallic material, wherein
the magnitude relation in corrosion resistance between the at least three structures differs between a first environment, a second environment, and a third environment,
the corrosive gas of the first type is present and the corrosive gas of the second type is not present in the first environment,
the corrosive gas of the second type is present and the corrosive gas of the first type is not present in the second environment, and
the corrosive gas of the first type and the corrosive gas of the second type are both present in the third environment, wherein
the coating material decreases the corrosion speed of the thin film including the second metallic material and covered with the coating material, in the first environment,
the coating material increases the corrosion speed of the thin film including the second metallic material and covered with the coating material, in the second environment and the third environment, and
the first metallic material has a lower corrosion resistance to the corrosive gas of the first type than the second metallic material.