G - Physics – 01 – N
Patent
G - Physics
01
N
349/40
G01N 29/02 (2006.01) G01N 29/024 (2006.01) G01N 29/22 (2006.01) G01N 29/32 (2006.01) G01N 29/34 (2006.01) G01N 29/36 (2006.01)
Patent
CA 2031115
Abstract of the Disclosure An ultrasonic gas measuring device including a housing, end walls for the housing, the end walls having a gas inlet and a gas outlet provided therethrough, ultrasonic detecting means provided within the housing means, the ultrasonic means having a transmitter, operatively mounted on one end wall, and a receiver, operatively mounted on the other end wall, arranged at spaced locations within the housing, the housing incorporating gas processing means for dividing the gas flow at least at some instance during its flow through the housing, electronic circuitry functioning to detect and generate a signal in cooperation with the ultrasonic detecting means representative of the concentration of gas passing through the housing, the electronic means also generating a reference signal corresponding to the electronic signal delivered to the ultrasonic means, a phase a shift of one of said signals to furnish an aligned phased relationship between the two signals whereby the concentration of the gas passing through the housing as detected by the ultrasonic means can be electronically computed and precisely determined by the said electronic means.
Puritan-Bennett Corporation
Smart & Biggar
LandOfFree
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