360 $^{\circ}$ Rotation Sensor Using a Chirped Fiber Grating

In this letter, a rotation sensor based on a chirped fiber grating for detecting the rotary position with a full 360 ^° shaft is proposed. A full circle reading 9.9 nm of wavelength shift for detecting the shaft´s rotation angle is experimentally demonstrated. The sensor can be used to measure a rotor´s rotation angle in random directions while continuously rotating in the same direction. The operation mechanism is mainly based on the shift of the reflective wavelength peak of a chirped fiber grating caused by a rolled ball type magnet in accordance with the shaft´s rotated angle.