Abstract
An axial force sensor for screw bolt using optical fiber grating (FBG, Fiber Bragg Grating) was studied and developed. This sensor has the tolerance to an electromagnetic noise. Furthermore, it has a characteristic as long-distance signal transmission possibility, because it made in optical fiber. This axial force sensor has a doughnut-formed projection. It is because the stress distribution in the sensor is got in only proportion to a screw bolt axis force. Axial force sensor for M10 screw bolt was produced experimentally. According to characteristic test result, reflection wavelength shift was in proportion to axial force. It means that this is good characteristic sensor.
