US 12,078,562 B2
Pressure sensor
Hideaki Hasegawa, Tokyo (JP); Hiroyuki Tamaoka, Tokyo (JP); Takeshi Yagi, Tokyo (JP); and Shinichi Arai, Tokyo (JP)
Assigned to FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed by FURUKAWA ELECTRIC CO., LTD., Tokyo (JP)
Filed on Sep. 3, 2021, as Appl. No. 17/446,876.
Application 17/446,876 is a continuation of application No. PCT/JP2020/009514, filed on Mar. 5, 2020.
Claims priority of application No. 2019-044462 (JP), filed on Mar. 12, 2019.
Prior Publication US 2021/0396617 A1, Dec. 23, 2021
Int. Cl. G01L 11/02 (2006.01); G02B 6/02 (2006.01); G02B 6/255 (2006.01)
CPC G01L 11/025 (2013.01) [G02B 6/0229 (2013.01); G02B 6/2551 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A pressure sensor, comprising:
a light source that outputs signal light;
a sensor optical fiber where the signal light is input and the signal light is propagated with a loss of 0.3 dB/m or more, wherein:
the sensor optical fiber has a core portion and a cladding portion formed around the core portion,
plural nanostructures are present near an interface between the core portion and the cladding portion,
the nanostructures each have a sectional diameter of 100 nm or smaller,
the sectional diameter being that of a cross section perpendicular to a longitudinal direction of the sensor optical fiber, and
the nanostructures are distributed in a length section of 1 m or less along the longitudinal direction; and
an optical receiver that receives the signal light propagated through the sensor optical fiber, wherein pressure applied to the sensor optical fiber is detected on a basis of intensity of the signal light received by the optical receiver.