Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1987-09-30
1988-11-29
Myracle, Jerry W.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 166
Patent
active
047872527
ABSTRACT:
A flow meter, or flow path intervalometer, transmits a transmission signal modulated with digital pseudo-noise or similar code. The received signal is correlated with the transmitted signal at successive times to produce a correlation function having a peak at a time to equal to the propagation time. The code is selected such that the side lobes of the correlation function are small. An interpolator determines a precise time of maximum correlation. In one embodiment, upstream and downstream correlation functions are defined and are correlated to determine an upstream-downstream propagation time difference interval .DELTA.t. In a preferred embodiment the digital code is a Barker code, and the transmitted signal is a finite interval wave which is phase modulated by the Barker code. In another embodiment, the received signal is a reflected signal which is range gated so as to represent flow data originating from a desired region within the conduit. The signal is sampled in phase quadrature and transformed to determine its frequency domain representation, and the devide derives local flow rate information from Doppler information. In yet another embodiment, a plurality of transducers are arranged to provide a number of sampling paths across the conduit, and the flow meter varies the range gating interval for the signal received along each path to derive a Doppler frequency, hence flow rate, for each of many sample intevals or bins along the path. The total flow in the conduit is then obtained by summing the flow in each bin times a cross-sectional area weighting factor.
REFERENCES:
patent: 4630482 (1986-12-01), Traina
Jacobson Saul A.
Korba James M.
Lynnworth Lawrence C.
Myracle Jerry W.
Panametrics, Inc.
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