Measuring and testing – Gas analysis – By vibration
Reexamination Certificate
2005-05-17
2005-05-17
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Gas analysis
By vibration
C073S597000
Reexamination Certificate
active
06892566
ABSTRACT:
A gas concentration sensor includes a measurement chamber for measuring a concentration of a specific gas component in a gas under measurement; an inflow path for allowing inflow of the gas under measurement thereinto and an outflow path for allowing outflow of the gas under measurement therefrom; a reflection wall for reflecting an acoustic wave; and an acoustic wave transmitting-receiving element having a transmitting-receiving surface adapted to transmit an acoustic wave toward the reflection wall and receive an acoustic wave reflected from the reflection wall. The concentration of the specific gas in the gas under measurement is detected on the basis of a propagation time between transmission of the acoustic wave and reception of the reflected acoustic wave. When a predetermined member having the sensor attached thereto is placed in a horizontal plane, the transmitting-receiving surface faces downward. A recess is formed in a peripheral portion of the reflection wall. The recess is receded toward a back surface of the reflection wall, namely, in a direction away from the transmitting-receiving surface.
REFERENCES:
patent: 4452090 (1984-06-01), Kou et al.
patent: 6308572 (2001-10-01), Ishikawa et al.
SAE Technical Paper Series No. 980306, “Closed Loop Canister Purge Control System” Feb. 1998.
M. Habaguchi et al., Gasoline Vapor Concentration Sensor—On Board Management by Ultrasonic Pulse-, Proceedings for Society of Automotive Engineers of Japan 955, 1955-9. pp. 89-92. Sep. 1995.
Banno Keigo
Ishida Noboru
Ishikawa Hideki
Sakamoto Masashi
Sato Yoshikuni
Lefkowitz Edward
Miller T
NGK Spark Plug Co. Ltd.
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