CPC G01L 11/025 (2013.01) [G02B 6/0229 (2013.01); G02B 6/2551 (2013.01)] | 13 Claims |
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.
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