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:
Aug. 02, 2005
Filed:
Aug. 01, 2003
Joseph Lawrence Chovan, North Syracuse, NY (US);
Martin Francis Lowry, Liverpool, NY (US);
Evelyn Hope Monsay, Brewerton, NY (US);
William Arthur Penn, Baldwinsville, NY (US);
William Pattee Whyland, Marcellus, NY (US);
Lawrence Richard Snowman, Liverpool, NY (US);
Joseph Lawrence Chovan, North Syracuse, NY (US);
Martin Francis Lowry, Liverpool, NY (US);
Evelyn Hope Monsay, Brewerton, NY (US);
William Arthur Penn, Baldwinsville, NY (US);
William Pattee Whyland, Marcellus, NY (US);
Lawrence Richard Snowman, Liverpool, NY (US);
Lockheed Martin Corporation, Bethesday, MD (US);
Abstract
The present invention relates to an optical sensor of air borne acoustic waves. The sensor comprises means for producing mutually coherent optical sampling and reference beams, which may be combined to form an intermediate frequency carrier, the sampling beam being exposed to the acoustic field, in which acoustic wave induced density variations occur. These density variations produce a variation in the index of refraction and thereupon a phase modulation of the sampling beam. This phase modulation may be recovered by an optical detector and a phase detector as an electrical signal representative of the acoustic signal. The invention has application to security systems.