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:
Jan. 03, 1978
Filed:
Dec. 13, 1976
Werner Grabendorfer, Bensberg-Refrath, DT;
Herbert Vogt, Burgwedel, DT;
Harri Haacke, Dusseldorf, DT;
Harry Kuhn, Langenfeld, DT;
Reinhard Pawelletz, Erkrath-Unterbach, DT;
Karl Ries, Mulheim, DT;
Krautkramer GmbH, Cologne, DT;
Mannesmann Aktiengesellschaft, Dusseldorf, DT;
Abstract
This invention relates to immersion ultrasonic pulse-echo testing of tubes or bars for internal defects wherein means are provided to continuously monitor the operation of the test channel. As ultrasonic energy enters the workpiece, the round workpiece surface causes acoustic energy scatter responsive echo signals which are sensed by the transmitter probe, are amplified and applied to a threshold circuit. If the amplitude of the scatter responsive signal falls below a predetermined level, an output signal indicative of 'loss of operation' is produced. Means are provided to inhibit such output signal in the event of only a momentary decrease of the scatter responsive signal below a predetermined value.