Patent Number: 6,298,008

Title: Pulse-echo system for mediums having varying densities

Abstract: A method of measuring the position of a target feature in a pulse-echo ranging system including transmitting at least one pulse of high frequency energy from a transducer towards the target feature, receiving energy reflected back from the direction of the target feature to the transducer to provide at least one return signal, repeatedly sampling the amplitude of the return signal(s) at intervals to form a digital database relating signal amplitude to elapsed time, and searching the database for at least one target zone in which a greater than background rate of fall of the return signal amplitude is sustained.

Inventors: Lyon; Quinton (Peterborough, CA), Woodward; Steven J. (Port Hope, CA)

Assignee: Siemens Milltronics Process Instruments Inc.

International Classification: G01F 23/284 (20060101); G01S 13/00 (20060101); G01S 13/18 (20060101); G01S 15/00 (20060101); G01S 15/18 (20060101); G01S 7/40 (20060101); G01S 7/52 (20060101); G01S 015/08 (); G01S 015/00 ()

Expiration Date: 10/02/2018