Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1974-12-13
1976-11-09
Queisser, Richard C.
Measuring and testing
With fluid pressure
Dimension, shape, or size
73160, G01B 1302
Patent
active
039902927
ABSTRACT:
A frequency modulated fluidic gauge having no moving parts for monitoring a characteristic of a continuously moving strand-like material. The gauge is comprised of a fluidic oscillator circuit including a fluidic amplifier, and a fluidic phase shifting network for fluidically coupling an output fluidic signal from an amplifier output port to an amplifier control input port at a phase angle that insures oscillation of an output signal from the amplifier output port at a predetermined frequency which is proportional to the characteristic of the material being monitored. The phase shifting network is comprised of a fluidic capacitor, an enclosed gauging channel for receiving the strand-like material passing therethrough, means for fluidically coupling the output signal from the amplifier output port to the gauging channel, and means for fluidically coupling at least a portion of the output signal to the fluidic capacitor and the amplifier control port. A part of the gauging channel, which receives that portion of the output signal passing between the walls of the gauging channel and the continuously moving strand-like material, defines a variable fluidic resistor, whereby the frequency of the oscillator output signal varies inversely as the product of the variable resistor and the fluidic capacitor.
REFERENCES:
patent: 3271997 (1966-09-01), Horne et al.
patent: 3282085 (1966-11-01), Benson et al.
patent: 3728894 (1973-04-01), Stern
patent: 3768303 (1973-10-01), Rauch
Bernkopf Walter C.
Cahill Robert A.
General Electric Company
Queisser Richard C.
Roskos Joseph W.
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