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:
Apr. 04, 1989
Filed:
Jul. 01, 1987
Friedhelm Schlawne, Kerpen-Sindorf, DE;
Mannesmann AG, Duesseldorf, DE;
Abstract
Defects are detected in cylindrical rods, tubes or the like by a stationary transmission and receiving device arranged along the path which the test object passes axially by providing per test cycle a particular pulse being split for propagating bidirectionally azimuthally in the test object; both pulses are received repeatedly, once per circulation, so that a plurality of pulses appear with gradually declining amplitude; a sequence of burst signals, each of limited duration, is provided for purposes of timing and gating the burst being repeated per circulation on the basis of the expected and known propagation time between transmission and receiving portions; peaks of the received signal are detected once or twice per circulation and in synchronism with the timing and gating signal; the respective detected peak signals are digitized, summed in groups and the quotient of the sums is formed as quality indicator.