Roadbed emptying monitoring sensor based on distributed optical fiber sensing technology

According to the roadbed emptying monitoring sensor based on the distributed optical fiber sensing technology, optical fibers penetrate through an optical fiber telescopic control spring at certain intervals and are fixed to the two ends of the stretched optical fiber telescopic control spring, so that certain deformation redundancy is given to the optical fibers in the sensor in a non-working state; the optical fiber is prevented from being fractured due to overlarge local stress before the sensor is transported or installed; the optical fiber at the interval section of the two optical fiber telescopic control springs is sleeved by the protection groove and is covered by the deformation block; an armored protective sleeve is sleeved outside the optical fiber telescopic control spring, so that the optical fiber telescopic device is protected; optical fibers at the end parts of the protection grooves are connected with jumpers; the jumpers are led out of the pavement and are connected with an optical fiber dem