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:
Jun. 23, 2026
Filed:
Apr. 02, 2024
Applicant:
Exfo Inc., Quebec, CA;
Inventors:
Hongxin Chen, Montreal, CA;
Michel Leblanc, Quebec, CA;
Assignee:
EXFO Inc., Quebec, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01H 9/00 (2006.01); G01D 5/353 (2006.01);
U.S. Cl.
CPC ...
G01H 9/004 (2013.01); G01D 5/35358 (2013.01);
Abstract
There is provided a method and system of frequency dithered distributed acoustic sensing (FD-DAS) using group data signal processing, where the continuous wave (CW) coherent laser's optical frequency or optical phase for the FD-DAS interrogator may be set in evenly or randomly distributed manner for different data groups but they are kept as constant or with negligibly variation within each data group. Such FD-DAS may be used to improve acoustic or vibration signal measurement reliability, to allow to use a low-cost single-frequency laser such as a DFB laser, and/or to suppress polarization fading effect.