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:
Dec. 13, 1983
Filed:
Oct. 01, 1981
Applicant:
Inventor:
William G Rau, Malvern, PA (US);
Assignee:
Burroughs Corporation, Detroit, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; G01R / ; G01S / ;
U.S. Cl.
CPC ...
331 65 ; 310316 ; 310335 ; 340686 ; 324327 ; 328-5 ;
Abstract
The present disclosure describes a system for detecting very small displacements of an object with respect to a self oscillating piezoelectric crystal by means of acoustic interference at the crystal. Acoustic energy transmitted by the oscillator is reflected by the object, and movement of the latter causes changes in the phase of the reflected energy. Such changes in turn result in variations in the amplitude of the oscillations. An electronic circuit responsive to the last mentioned variations generates output signals indicative of the instantaneous position of the object.