US 12,092,514 B2
Optical fiber sensing system, optical fiber sensing device, and method for detecting pipe deterioration
Yukihide Yoda, Tokyo (JP); Naoto Ogura, Tokyo (JP); and Yoshiaki Aono, Tokyo (JP)
Assigned to NEC CORPORATION, Tokyo (JP)
Appl. No. 17/626,209
Filed by NEC Corporation, Tokyo (JP)
PCT Filed Jul. 15, 2020, PCT No. PCT/JP2020/027424
§ 371(c)(1), (2) Date Jan. 11, 2022,
PCT Pub. No. WO2021/010407, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 2019-131495 (JP), filed on Jul. 16, 2019.
Prior Publication US 2022/0244097 A1, Aug. 4, 2022
Int. Cl. G01H 9/00 (2006.01); F17D 5/06 (2006.01); G01D 5/353 (2006.01); G01N 29/04 (2006.01); G01N 29/06 (2006.01)
CPC G01H 9/004 (2013.01) [F17D 5/06 (2013.01); G01D 5/35358 (2013.01); G01N 29/069 (2013.01); G01N 29/043 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical fiber sensing system comprising:
an optical fiber that is laid in a pipe;
a processor; and
a memory storing instructions executable by the processor to:
receive, from the optical fiber, an optical signal superimposed with vibration detected by the optical fiber;
extract a vibration pattern of the vibration detected by the optical fiber from the optical signal;
change a matching pattern according to a substance flowing through the pipe;
compare the vibration pattern of the vibration detected by the optical fiber with the changed matching pattern; and
determine a degradation state of the pipe based on a comparison result.