Karman vortex type flow measuring apparatus

Details Karman vortex type flow measuring apparatus Karman vortex type flow measuring apparatus

1980-02-22

1982-06-15

Gill, James J.

Measuring and testing

Simulating operating condition

Marine

7386122, G01F 132

Patent

active

043344267

ABSTRACT:
A Karman vortex type flow measuring apparatus comprises a conduit (2) for a fluid whose flow rate or flow velocity is to be measured, and a columnar vortex shedding member (3) extending within the conduit transversely of the fluid flow direction. Frequency of the vortex shedding is detected by a detector (6) whose output electrical signal is compared by a comparator (20) with a slice level signal, to generate a pulse train which is synchronous with the vortex shedding frequency. The slide level is variable in response to fluctuation in the output electrical signal of the detector (6). A highly accurate measurement can be achieved even when the vortex shedding is unstable.

REFERENCES:
patent: 3225213 (1965-12-01), Hinrichs et al.
patent: 3832577 (1974-08-01), Harr
patent: 3982434 (1976-09-01), McMurtrie
IBM Technical Disclosure Bulletin, vol. 20, No. 8, Jan. 1978, "Threshold Circuit", by Yount, pp. 3199-3200.
"Electronics", Jun. 12, 1975, Auto Firms Look at Thin-Film Meter, pp. 31-32.

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