METHOD AND APPARATUS FOR CLASSIFYING GASEOUS AND NON-GASEOUS OBJECTS

摘要

Ultrasonic pulse echo object classification is described. A broadband ultrasound transducer transmits a broadband ultrasound pulse towards the object and detecting an associated ultra sound echo of that pulse from the object. An ultrasound receiver receives the detected echo signal. A signal processor, coupled to the ultrasound receiver, determines and analyzes a time duration parameter and a frequency parameter (and possibly one or more other parameters like amplitude and/or phase) of the detected echo signal and classifies the object as a solid or liquid or as gaseous based on the parameters of the detected echo signal.