Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1981-11-13
1983-11-08
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386104, G01F 166
Patent
active
044135319
ABSTRACT:
A Doppler flowmeter impulses an ultrasonic fixed-frequency signal obliquely into a slurry flowing in a pipe and a reflected signal is detected after having been scattered off of the slurry particles, whereby the shift in frequencies between the signals is proportional to the slurry velocity and hence slurry flow rate. This flowmeter filters the Doppler frequency-shift signal, compares the filtered and unfiltered shift signals in a divider to obtain a ratio, and then further compares this ratio against a preset fractional ratio. The flowmeter utilizes a voltage-to-frequency convertor to generate a pulsed signal having a determinable rate of repetition precisely proportional to the divergence of the ratios. The pulsed signal serves as the input control for a frequency-controlled low-pass filter, which provides thereby that the cutoff frequency of the filtered signal is known. The flowmeter provides a feedback control by minimizing the divergence. With the cutoff frequency and preset fractional ratio known, the slurry velocity and hence flow will also be determinable.
REFERENCES:
patent: 3940731 (1976-02-01), Cooper et al.
patent: 4095597 (1978-06-01), Hassler
patent: 4255977 (1981-03-01), Newhouse et al.
"Flow Measurement of Dense Slurries Using the Sonic Doppler Principle", H. B. Karplus and A. C. Raptis, Conference, Cherry Hill, N.J., (25-27 Sep. 1978), IEEE, pp. 291-295.
Karplus Henry H. B.
Raptis Apostolos C.
Besha Richard G.
Goldstein Herbert
Lind Charles F.
Mansfield Bruce R.
The United States of America as represented by the United States
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