The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1989
Filed:
Dec. 29, 1987
Rudolf Bender, Lich, DE;
Jorg Quittkat, Neuberg, DE;
Nukem GmbH, Hanau, DE;
Abstract
A method and an apparatus for measuring the wall thickness of a workpiece by ultra-sound is disclosed. For measuring the wall thickness, it is necessary to determine the time interval between a surface echo occurring during irradiation by ultra-sound and a rear wall echo. According to the present invention, a saw tooth generator generates a saw tooth signal including a sequence of saw teeth when the surface echo occurs. Each of the saw teeth causes a counting pulse to be generated. Upon occurrence of the rear wall echo, the instantaneous amplitude value of the saw tooth signal is measured and the number of counting pulses is recorded by a counter. Each counting pulse defines a constant unit of wall thickness. The amplitude value provides a fraction of such wall thickness unit.