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:
Jul. 27, 2004
Filed:
Jan. 24, 2002
Applicant:
Inventors:
Assignee:
Aston Photonic Technologies Limited, Birmingham, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J 5/08 ;
U.S. Cl.
CPC ...
G01J 5/08 ;
Abstract
A fiber optic grating sensor ( ) comprising an optical fiber ( ) in which a grating portion ( ) is provided, the refractive index ( ) of the fiber ( ) varying periodically along the grating portion ( ). The periodic variation of the refractive index ( ) has an amplitude envelope which includes, in this example, two regions ( ) in which the amplitude of the envelope is substantially reduced, and in this example is substantially nulled. The null regions ( ) give the grating portion a spectral profile ( ) within which there are, in this example two pass bands ( ).