Method of measuring the height of a liquid using a...

Details Method of measuring the height of a liquid using a... Method of measuring the height of a liquid using a...

2008-01-15

2008-01-15

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Immersible electrode type

Reexamination Certificate

active

07318345

ABSTRACT:
The invention relates to a method of measuring the height of a liquid using a high-frequency line probe. According to the invention, a comparison is made, on an electric circuit (3) which is supplied with high-frequency alternating current, between the impedance of a coaxial or non-coaxial line probe (1) and a reference resistor (17), using a resistive measuring bridge (7). The probe (1), which is submerged in a lank of the fluid of which the height is to be determined, forms one measuring arm of the measuring bridge and the above-mentioned reference resistor (17) forms an opposite arm of the measuring bridge, the comparison signal resulting from the alternative measurement of the signals on each of said arms using a suitable detector. Subsequently, the comparison signal is processed in order to obtain the calculation of the height of the liquid according to the permittivity thereof, the length of the probe (1) and the circuit (3) power line frequency.

REFERENCES:
patent: 4284951 (1981-08-01), Dahl et al.
patent: 6237412 (2001-05-01), Morimoto
patent: 6486679 (2002-11-01), Holt
patent: 0 360 405 (1990-03-01), None
patent: 0 405 835 (1991-01-01), None
patent: 1 121 661 (1956-08-01), None

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