Measuring and testing – Liquid level or depth gauge
Patent
1997-03-31
1998-10-13
Williams, Hezron E.
Measuring and testing
Liquid level or depth gauge
324642, 324643, G01F 2300, G01R 2704
Patent
active
058195823
ABSTRACT:
Slow wave, time-domain reflectometer based point level sensors and instruments. Such sensors and instruments include a transmission line having an inner conductor, an outer shield that extends over that inner conductor so as to define a gap between the inner conductor and the outer shield, a dielectric material that fills the gap, except at a point, thereby defining a space, and an access opening for enabling a material being sensed to fill the space when that material is present. According to the invention the dielectric material has a permittivity substantially different from the material being sensed. Further included are a pulse generator for generating pulses on the transmission line, and a processing unit for determining whether the material being sensed fills the space. Beneficially the inner conductor is helically wound around a core, creating a slow wave transmission line.
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Politzer Jay L.
Williams Hezron E.
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