Flow meter for gaseous media

Details Flow meter for gaseous media Flow meter for gaseous media

2008-03-18

2008-03-18

Thompson, Jewel (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

Reexamination Certificate

active

11223560

ABSTRACT:
For the purpose of metering a flow of gaseous media, there is arranged a perturbation body in a measuring chamber which has a medium flowing through it, and an ultrasonic excitation signal is transmitted through the measuring chamber transverse to the direction of flow and at a point downstream of the perturbation body. The ultrasonic excitation signal after having traversed the measuring chamber is captured together with the ultrasonic excitation signal transmitted as structure-borne noise. The captured signal is squared first and then demodulated with a filter. An indication for the flow through the measuring chamber is derived from the frequency of the demodulated signal.

REFERENCES:
patent: 4879908 (1989-11-01), Tutumi
patent: 5503035 (1996-04-01), Itoh et al.
patent: 3601407 (1987-07-01), None
patent: 38 72 276 (1988-09-01), None
Menz, Bernhard, Dittes, Markus; Vortex-Durchflussmesser mit akustischer Wirbeldetektion in Clamp-on Technik; Technisches Messen 64 (1997), pp. 54-59.

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