Patent ID: 6397656
Filing Date: 2002-06-04
Classification: B06B,G01F,G01N

Abstract:
An object detecting system using an ultrasonic sensor, said object detecting system comprising:a detector for being mounted on an outside face of a vessel; operating frequency setting means for causing said detector to emit an ultrasonic wave a plurality of times while varying a frequency, for inputting an emission waveform or a reflected waveform at that time, for detecting a resonance frequency of a system comprising said detector and said outside face of said vessel on the basis of an analysis of the inputted waveform, and for setting the detected resonance frequency as an operating frequency; and a detection operation control circuit for causing said detector to emit the ultrasonic wave toward an object to be detected in said vessel and to receive a reflected wave from said object, and for controlling an object detecting operation on the basis of a measured period of time between the ultrasonic wave emitting time and the reflected wave receiving time.