| 摘要 |
PURPOSE: An optical deformation sensor is provided to prevent an optical fiber from being damaged for a long term by coating a polymer material having a relatively high elasticity around the optical fiber, and improve measuring sensitivity of minute deformation of an establishment owing to a pressing protrusion for pressing a core of the optical fiber on an inner peripheral surface of the coating material. CONSTITUTION: An optical deformation sensor in which an end of an optical fiber(20) is connected to a light source(40) and the other end is connected to a loss measuring device(50) for measuring deformation degree of buildings, tunnels, bridges, dams and the like, includes a pair of fixing elements(10) fixedly mounted at predetermined positions of an establishment separately from each other, a coating material(21) fixed mounted to the fixing elements to be applied with tension and having at least one pressing protrusion on an inner periphery to be extended longitudinally and radially according to deformation of the establishment, and an optical fiber core(25) fitted into the coating material or coated by the coating material to be pressed by the pressing protrusion, wherein tension and side pressure are applied to the optical fiber ribbon by the fixing elements, which are alienated from each other, and an optical loss is generated in proportion to the side pressure while a predetermined optical signal is passing through the optical fiber, so that the deformation of the establishment is precisely measured by sensing the optical loss.
|
