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:
Oct. 28, 2003
Filed:
May. 20, 2002
Kohji Toda, Yokosuka, JP;
Other;
Abstract
A vibration displacement sensing system comprises a piezoelectric substrate, first- and second comb-shaped electrodes, a counter electrode, and a signal analyzer. When input electric signals are applied between the first comb-shaped electrode and the counter electrode, longitudinal waves are radiated into a medium, and reflected at a material in the medium. If the material vibrates in response to times T , reflected longitudinal waves are detected between the second comb-shaped electrode and the counter electrode as delayed electric signals D in accordance with distances Z between the counter electrode and the material. In this time, the distances Z correspond with the times T , respectively. Electrical coupled-signals from the input electric signals and the delayed electric signals D interfere respectively, so that respective interference signals R occur. A vibration displacement caused by the material is estimated from the interference signals R .