Dual frequency acoustic fluid flow method and apparatus

Details Dual frequency acoustic fluid flow method and apparatus Dual frequency acoustic fluid flow method and apparatus

1983-11-07

1985-07-09

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

045274320

ABSTRACT:
An acoustic fluid flow meter determines the flow velocity or volumetric flow from a measurement of the phase shift of acoustic signals propagated upstream and downstream along an acoustical path in the fluid. High resolution measurements of the phase difference of transmitted and received signals represent the fractional wavelength which exceeds the integral number of waves along the acoustic path. The low resolution determination of the integral and fractional number of waves for each direction is made by measuring the fractional phase shift at one frequency of the acoustic signal and again at a slightly different frequency of the acoustic signal. The difference of those phase shift measurements is proportional to the number of waves along the path for a given direction of propagation. That value is combined with high resolution fractional phase shift measurement to obtain a high resolution total wave number value for each direction of propagation. The difference of those two values then is proportional to the fluid flow.

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Camac et al., "Absolute Distance Measurement by Variable Wavelength Interferometry", in Applied Optics, vol. 20, #3, 2/81, pp. 400-403.

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