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:
Sep. 19, 2023
Filed:
Apr. 09, 2021
Ultra Communications, Inc., Vista, CA (US);
Joseph Farzin Ahadian, San Marcos, CA (US);
Sandra Skendzic, Vista, CA (US);
Man W. Wong, San Diego, CA (US);
Charles B. Kuznia, Encinitas, CA (US);
ULTRA COMMUNICATIONS, INC., Vista, CA (US);
Abstract
Methods and devices for a single wavelength fiber optic sensor system are described. Sensing is based on relative shift in spectral responses of two co-located fiber gratings (FBGs) within a fiber optic cable and measured at one measurement wavelength. Under a range of conditions of interest, the shift in spectral responses maintains the measurement wavelength within respective slopes of the spectral responses. A normalized difference in reflected power is used to desensitize the measurement from any variation in power of the single laser power and/or in loss through the fiber optic cable. Several pairs of co-located FBGs may be used within the same fiber optic cable, each pair used for sensing at a corresponding location. An OTDR system couples light pulses at the measurement wavelength to the fiber optic cable, and measures amplitudes and timing of corresponding reflected light pulses to perform the normalized difference.