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. 03, 2005
Filed:
Dec. 12, 2001
Erlend Ronnekleiv, Trondheim, NO;
Dag Roar Hjelme, Trondheim, NO;
Jon Thomas Kringlebotn, Trondheim, NO;
Erlend Ronnekleiv, Trondheim, NO;
Dag Roar Hjelme, Trondheim, NO;
Jon Thomas Kringlebotn, Trondheim, NO;
Optoplan AS, Trondheim, NO;
Abstract
A fiber optic sensor system comprises at least one measuring sensorproviding an optical output dependent upon one or more parameters to be measured, e.g. temperature, and at least one reference sensorproviding a reference output for comparison with the measuring sensor output. The reference sensor is provided in a birefringent fiber. The system includes a detecting meanswhereby a reference beat signal fis derived by measuring the optical frequency splitting between frequency components in different polarization planes of the reference sensor output. A further beat signal fis generated between the measuring and reference sensor outputs, such beat signals being used to derive a measurement of one or more parameters.