Patent ID: 6631639
Filing Date: 2003-10-14
Classification: G01F

Abstract:
A system for measuring the level of liquid in the interior of a vessel comprising:a pair of ultrasonic transducers mounted spaced apart on the exterior of the wall of the vessel; means for producing single pulses of electrical energy at successive spaced times having an output coupled to one of said transducers which converts each electrical energy pulse to a corresponding pulse of electro-mechanical energy that is applied to the vessel wall to generate propagation of an elastic wave in the vessel wall that is received after a phase delay by the other transducer which converts the received elastic wave into an electrical signal waveform; and means for processing a said electrical signal waveform from said other transducer to determine the phase delay between the start of propagation of said elastic wave by said one transducer and the reception of the elastic wave by said other transducer.