Fluid parameter measurement in pipes using acoustic pressures

Details Fluid parameter measurement in pipes using acoustic pressures Fluid parameter measurement in pipes using acoustic pressures

2005-03-08

2005-03-08

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

C073S061470, C073S061490, C073S597000, C073S643000

Reexamination Certificate

active

06862920

ABSTRACT:
At least one parameter of at least one fluid in a pipe is measured using a spatial array of acoustic pressure sensors placed at predetermined axial locations along the pipe12. The pressure sensors provide acoustic pressure signals, which are provided to a signal processing system that determines the speed of sound amixof the fluid (or mixture) in the pipe12using acoustic spatial array signal processing techniques. Numerous spatial array processing techniques may be employed to determine the speed of sound amix. The speed of sound amixis provided to another logic system that calculates the percent composition of the mixture, e.g., water fraction, or any other parameter of the mixture or fluid which is related to the sound speed amix. The signal processing system may also determine the Mach number Mx of the fluid. The acoustic pressure signals measured are lower frequency (and longer wavelength) signals than those used for ultrasonic flow meters, and thus are more tolerant to inhomogeneities in the flow. No external source is required and thus may operate using passive listening. The invention will work with arbitrary sensor spacing and with as few as two sensors if certain information is known about the acoustic properties of the system.

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