Patent ID: 8149648
Filing Date: 2012-04-03
Classification: G01F,G01S

Abstract:
1. A method of processing echo pulses in a pulse-echo measurement system, comprising: providing and using a tank containing a material, wherein the tank comprises an ultrasonic transducer; providing and using a microprocessor which is coupled to the ultrasonic transducer via a transmitter; generating ultrasonic pulses using the ultrasonic transducer, wherein the ultrasonic pulses are reflected by a top surface of the material in the tank; receiving reflected pulses by the transducer and converting the reflected pulses into electrical signals; generating a digital echo profile based on the electrical signals, wherein the digital echo profile is processed by the microprocessor, comprising: identifying a rising edge of an echo; defining a rising edge reference point; fitting a parabolic curve to the rising edge; calculating an error correction as being the lesser of adding the calculated error correction to a previous error correction using a first order filter to provide an updated error correction value.