US 11,719,559 B2
Fiber optic sensing system for grid-based assets
Peter Kiesel, Palo Alto, CA (US); Ajay Raghavan, Mountain View, CA (US); Todd Karin, Fairfield, CA (US); and Qiushu Chen, San Jose, CA (US)
Assigned to PALO ALTO RESEARCH CENTER INCORPORATED, Palo Alto, CA (US)
Filed by Palo Alto Research Center Incorporated, Palo Alto, CA (US)
Filed on Oct. 28, 2019, as Appl. No. 16/665,015.
Claims priority of provisional application 62/925,611, filed on Oct. 24, 2019.
Prior Publication US 2021/0123775 A1, Apr. 29, 2021
Int. Cl. G01D 5/353 (2006.01); G01K 11/32 (2021.01); G01R 31/62 (2020.01); G01L 1/24 (2006.01)
CPC G01D 5/35345 (2013.01) [G01K 11/32 (2013.01); G01L 1/242 (2013.01); G01R 31/62 (2020.01)] 14 Claims
OG exemplary drawing
 
1. A sensor system comprising:
a sensor network comprising at least one optical fiber that includes one or more optical sensors, the optical sensors arranged to sense vibration of an electrical device and to produce a time varying light output in response to the vibration;
at least one detector configured to generate an electrical time domain signal in response to the time varying light output of at least one optical sensor of the sensor network; and
an analyzer configured to:
acquire at least one snapshot frequency component signal comprising one or more time varying signals of frequency components of the time domain signal over a data acquisition time period; and
detect a condition of the electrical device based on the snapshot frequency component signal;
wherein the electrical device is electrically connected to a power grid, and the snapshot frequency component signal includes a frequency of the power grid and one or more harmonics thereof.