US 12,405,156 B2
Colorless distributed fiber optic sensing / distributed vibration sensing
Yaowen Li, Princeton, NJ (US); Jian Fang, Princeton, NJ (US); Shuj Murakami, Monmouth Junction, NJ (US); Philip Ji, Cranbury, NJ (US); and Ting Wang, West Windsor, NJ (US)
Assigned to NEC Corporation, Tokyo (JP)
Filed by NEC Laboratories America, Inc., Princeton, NJ (US)
Filed on Nov. 15, 2022, as Appl. No. 17/987,822.
Claims priority of provisional application 63/313,060, filed on Feb. 23, 2022.
Claims priority of provisional application 63/280,710, filed on Nov. 18, 2021.
Prior Publication US 2023/0152151 A1, May 18, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. G01H 9/00 (2006.01); G01D 5/353 (2006.01)
CPC G01H 9/004 (2013.01) [G01D 5/35361 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A colorless distributed fiber optic sensing/distributed vibration sensing (DFOS/DVS) system comprising:
a length of optical sensor fiber;
a colorless DFOS/DVS interrogator in optical communication with the optical sensor fiber, said colorless DFOS/DVS interrogator configured to generate optical pulses, introduce the generated pulses into the length of optical sensor fiber, and receive backscattered signals from the length of the optical sensor fiber; and
an intelligent analyzer configured to analyze colorless DFOS/DVS data received by the DFOS/DVS interrogator and determine from the backscattered signals, vibrational activity occurring at locations along the length of the optical sensor fiber;
wherein the colorless DFOS/DVS interrogator includes a narrow bandwidth tunable laser source.