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:
May. 08, 2001
Filed:
Aug. 26, 1996
Stanley A. Fisher, Boyds, MD (US);
Larry S. Chandler, Falls Church, VA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
The invention is directed to a fiber-optic sensor for measuring acoustic signals originating from a single point remote from the sensor. The sensor includes a sensing cable formed with a light transmitting optical fiber core encased within an acoustically sensitive jacket that is bonded to the optical fiber core; a reference cable formed with a light transmitting optical fiber core encased within a protective jacket that is not bonded to the optical fiber core; a base structure forming a concave surface having a focal point that corresponds to the point in space from which acoustic measurements are desired; an acoustically sensitive surface formed by mounting the sensing cable and the reference cable in a collocated pair onto the concave surface; a coherent light source connected to and transmitting light to the sensing optical fiber and the reference optical fiber; and an electro-optic processor connected to and receiving transmitted light from the sensing optical fiber and the reference optical fiber and suitable for determining phase shift differences between transmitted light from the sensing and reference optical fibers.