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:
Feb. 13, 1990
Filed:
Nov. 15, 1988
Glenn M Light, San Antonio, TX (US);
Edward A Bloom, San Antonio, TX (US);
Soung-Nan Liu, Freemont, CA (US);
Electric Power Research Institute, Palo Alto, CA (US);
Abstract
An inspection system for non-destructively detecting physical defects in solid shafts by launching and receiving longitudinal acoustic waves has been described incorporating a transducer head containing a transducer head containing a matrix of transducers, pulsers, pulse width modulators, preamplifiers and a summing amplifier. A fiber optic cable may couple the transducer head to a remote location containing a receiver and a oscilloscope. The invention overcomes the problem of launching longitudinal acoustic waves with insufficent energy. Further, the invention overcomes the problem of asymmetric load conversions affecting the output signal arising at times when only one transducer is used and is positioned off center with respect to the solid shaft.