Acoustic sensor for in-line continuous monitoring of gasses

Details Acoustic sensor for in-line continuous monitoring of gasses Acoustic sensor for in-line continuous monitoring of gasses

1996-11-13

1998-06-23

Williams, Hezron E.

Measuring and testing

Gas analysis

By vibration

73 2401, 73 232, 73579, 73597, 73648, G01F 1700, G01N 2922

Patent

active

057689377

ABSTRACT:
An acoustic cell includes multiple acoustic cavities fluidly coupled together. At least two of the acoustic cavities have unequal lengths and cross sections. End segments of the acoustic cell are uniformly cylindrically shaped or conically shaped. A driver transducer at one end of the acoustic cell and a receiver transducer at another end of the acoustic cell are acoustically isolated from the acoustic cell. A pair of preferably metallic isolation diaphragms transmit acoustic signals to and from the transducers without significantly altering the phase-frequency characteristics of the acoustic signals. The acoustic cell operates as an acoustic resonator operating at frequencies lower than any possible self-resonance frequencies of the isolation diaphragms or the driver and receiver transducers. When a binary gas is flowed through the cell, a processor detects a resonant frequency of the gas within the cell to determine a composition of the gas.

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