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:
Nov. 04, 2003
Filed:
May. 20, 2002
Kohji Toda, Yokosuka 239-0814, JP;
Other;
Abstract
A system for measuring sound velocity in material comprises a piezoelectric substrate, first- and second comb-shaped electrodes, and a counter electrode in contact with a surface-part of a material. When input electric signals E having carrier frequencies f , respectively, are applied between the first comb-shaped electrode and the counter electrode in turn, longitudinal waves are radiated into the material. The longitudinal waves are reflected at the opposite surface-part of the material, and then, detected between the second comb-shaped electrode and the counter electrode as delayed electric signals D , respectively. The input electric signals E and the delayed electric signals D interfere respectively, so that respective interference signals R occur. A sound velocity V in the material is estimated from the interference signals R .