Sensing device for track occupancy inspection

The utility model belongs to the technical field of rail transit, and particularly relates to a sensing device for rail occupancy inspection, which comprises an optical cable. A fiber grating sensor is recorded on the optical cable; the optical cable comprises m optical fibers, and the optical cable comprises m * n fiber grating sensors. Wherein m and n are integers greater than 0. The fiber bragggrating sensor can measure the pressure strain generated by a vehicle wheel set on a pressure occupying steel rail, continuous rail occupation inspection is achieved by laying the fiber bragg gratingsensors which are dense enough along the steel rail, and the functions of train positioning, length measurement, speed measurement, train integrity inspection and the like can be achieved. In order to overcome the limitation of the wavelength division multiplexing technology on the number of single-channel sensors, the patent provides a mode of burning sensors in groups on different optical fibers, and realizes long-dista