STRAIN SENSOR AND STRAIN AMOUNT MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a strain sensor and a strain amount measurement method that can detect a strain amount of a thickness direction in a highly accurate manner while suppressing the size to enlarge.SOLUTION: The strain sensor comprises: a maker 3 regularly and periodically arrayed in a first direction that is parallel to a direction orthogonal to a light-receiving surface of a strain body in which strain occurs in particles generating a surface plasmon due to a load and also parallel to an in-plane direction of the light-receiving surface; a light source 2 for emitting light against the marker 3; a first detector (a detector 4) for detecting the spectrum intensity of the light reflected by the marker 3; a second detector (a signal processor 5) for detecting the absorption spectrum peak of the light reflected by the marker 3 on the basis of the spectrum intensity detected by the first detector; and a calculator (the signal processor 5) for calculating the strain amount of the direction orthogonal to the light-receiving surface on the basis of the absorption spectrum peak detected by the second detector. The strain body is composed of a transparent body, in which a particle has a diameter equal to or less than the wavelength of the light incident to the marker 3.SELECTED DRAWING: Figure 1