A large range self-displaying fibre optic grating displacement sensor

For the current fiber grating displacement sensor range is small and the sensor can't display the displacement value on the spot, a large range of self-displaying fiber grating displacement sensor is proposed, through all levels of the transmission mechanism in the sensor, converting the amount of stretch in the wire rope into stress on the fibre grating, which causes the change of the central wavelength of the reflected light of the fiber grating. The sensor adopts double grating structure, which can achieve automatic temperature compensation. Sensor internal mechanical digital display structure, through the sensor digital display window can be directly observed in the field to the displacement value. Calibration experiments and static characteristic analysis of the sensor, the results show that: the measurement range of the sensor for 0 ~ 1000mm, the accuracy can be within ± 5mm.