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:
Feb. 26, 1991
Filed:
Dec. 26, 1989
William W Morey, West Hartford, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
An arrangement for determining the magnitudes of selected physical quantities at a multitude of spaced locations includes an elongated optical fiber having a multitude of separate longitudinally spaced Bragg sensing gratings of substantially identical initial periodicity situated at such locations. Light pulses are launched into the core for propagation longitudinally thereof and for return from any of the sensing gratings of a detectable light echo at a central wavelength determined by the instantaneous value of the periodicity of the respective sensing grating that depends on the longitudinal stress applied to such grating as a result of the action of the physical quantity being monitored at the location of such grating. The light echoes are detected and allocated to the respective sensing gratings on the basis of time intervals elapsed between the issuance of the respective light pulses and the arrival of the echoes responsive thereto, and to the respective longitudinal stresses applied to the respective sensing gratings on the basis of the respective wavelengths of the echoes returned from the respective gratings.