Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-07-05
2005-07-05
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S861270, C073S861280, C073S001160
Reexamination Certificate
active
06912907
ABSTRACT:
An apparatus for measuring a gas concentration comprises a conduit through which an objective gas to be measured flows, a ultrasonic transmitting and receiving element fixed in a straight portion of the conduit and a reflecting plate fixed in the straight portion to face to the ultrasonic transmitting and receiving element. The apparatus further comprises a calibration gas source for supplying a calibration gas of which components and component ratio are preliminarily known, temperature sensors for measuring the temperature of the calibration gas flowing through the conduit, a propagation time calculating means for calculating the time period for propagation of the ultrasonic through the calibration gas in the conduit, a calibration means for calibrating the reference distance between the ultrasonic transmitting and receiving element and the reflecting plate based on the calculation results of the propagation time calculating means.
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Fayyaz Nashmiya
Rader & Fishman & Grauer, PLLC
Teijin Limited
Williams Hezron
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