One kind of crack monitoring sensor and method of use of the technique based otdr

One kind of fracture and methods of using OTDR monitoring sensor technology based on technical field belonging to the monitoring fiber, comprising a protective case, the bare optical fiber coil having two ends and a first, a second protective layer has an optical fiber; the bare optical fiber coil It is a length of a bare optical fiber through the optical fiber coil formed by winding the knot, and the bare fiber coil diameter between 14mm-16mm, when using the first sensor and a first external optical fiber, the second optical protective layer by welding tip and then releasing blocking action glue solution of epoxy glue, to ensure that the sensor can freely inside the fiber drawing as crack propagation, and then continue pouring the concrete, the present invention is not only convenient construction, production is simple, low cost, and can be applied to monitor the internal crack a variety of concrete structures, while workable, to achieve real-time monitoring of the internal structure of the concrete and distributed monitoring.