Optical-fiber displacement gage

PURPOSE: To make it possible to measure the accurate amount of displacement without the effects of the output fluctuation of a light source and the transmission loss of a lightguide caused by the temperature change of an environment and the like. CONSTITUTION: A detecting part 1, around which an optical fiber is wound, is deformed by the displacement of a body to be measured 2. The transmission loss at the time of the deformation is measured, and the amount of the displacement of the body to be measured is measured. The detecting part 1 or the detecting part 1 and optical transmission paths 3 and 4 are constituted of polarized-wave holding fiber. COPYRIGHT: (C)1993,JPO&Japio