Vibration type transducer

Details Vibration type transducer Vibration type transducer

1989-03-20

1991-02-05

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367167, 367171, 310348, 73702, 73704, H01L 4104, H01L 4108

Patent

active

049911538

ABSTRACT:
The apparatus of the present invention detects the resonant frequency of a vibratory member in contact with a fluid. The detection of the resonant frequency enables the device to be used to detect the density of a fluid which it is in contact with and thereby calculate the flow rate of the fluid. The vibratory member is mounted in a housing in such a way that the chambers on either side of the vibratory member have equal volumes. The fluid enters the device through a conduit and then divides into two equal tubes on either side of an extension of a vibratory member extending down these tubes. The apparatus for measuring the resonant frequency of the vibratory member is mounted on the vibratory member and is comprised of a piezoelectric element coupled to a driver circuit in a feedback loop.

REFERENCES:
patent: 3788140 (1974-01-01), Turtle
patent: 3817098 (1974-06-01), Brown
patent: 4208737 (1990-06-01), Thompson et al.
patent: 4236235 (1980-11-01), Gilbert
patent: 4600855 (1986-07-01), Strachan
patent: 4803671 (1989-02-01), Rochling et al.

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