US 12,436,003 B2
System to measure coil locations and lengths on aerial fiber cables by distributed fiber sensing for decision making
Yue Tian, Princeton, NJ (US); Yangmin Ding, East Brunswick, NJ (US); Sarper Ozharar, Pennington, NJ (US); Shaobo Han, Princeton, NJ (US); Ting Wang, West Windsor, NJ (US); Jiatong Li, Piscataway, NJ (US); Zhuocheng Jiang, Plainsboro, NJ (US); and Yuanda Xu, Jersey City, NJ (US)
Assigned to NEC Corporation, Tokyo (JP)
Filed by NEC Laboratories America, Inc., Princeton, NJ (US)
Filed on May 11, 2023, as Appl. No. 18/316,208.
Claims priority of provisional application 63/341,441, filed on May 13, 2022.
Claims priority of provisional application 63/341,453, filed on May 13, 2022.
Prior Publication US 2023/0366703 A1, Nov. 16, 2023
Int. Cl. G01D 5/353 (2006.01); G01H 9/00 (2006.01); G06N 20/00 (2019.01)
CPC G01D 5/35358 (2013.01) [G01H 9/004 (2013.01); G06N 20/00 (2019.01)] 5 Claims
OG exemplary drawing
 
1. A method of determining coil locations and lengths of an optical fiber cable using distributed fiber optic sensing (DFOS) system, the method comprising:
providing the DFOS system including
a length of optical sensor fiber, at least a portion of the length of optical sensor fiber being coiled;
an optical interrogator in optical communication with the length of optical sensor fiber, the optical interrogator configured to generate optical pulses from laser light, introduce the pulses into the optical sensor fiber and receive backscattered signals from the optical sensor fiber, wherein the backscattered signals received originate at locations of the length of optical sensor fiber and result from environmental activities occurring at the locations of the length of the optical sensor fiber;
an analyzer configured to store and analyze the backscattered signals received from locations along the length of the optical sensor fiber;
operating the optical interrogator for a predetermined time and storing the backscattered signals received from the locations along the length of the optical sensor fiber;
pre-processing the stored backscattered signals using a short-time Fourier transform such that transformed segmented spectral data for the locations along the length of the optical sensor fiber is produced;
training a machine learning model using the transformed segmented spectral data for the locations along the length of the optical sensor fiber together with identification of whether a corresponding location is part of a coil of optical fiber sensor or straight-line optical fiber sensor;
operating the optical interrogator in a coil location detection mode and generate detection mode backscattered signals for locations along the length of the optical fiber sensor, transform the detection mode backscattered signals into detection transformed segmented spectral data for locations along the length of the optical fiber; and
determining, from the trained machine learning model and the transformed segmented spectral data for locations along the length of the optical fiber, any locations along the length of the optical fiber sensor including a coil of optical fiber sensor.