Abstract:In precision angle sensor, the sensitivity and noise performance are two factors influencing the sensor accuracy. In order to improve the sensitivity and noise performance of the angle sensor,a new type of precision angle sensor has been built by combing the optical lever with Sagnac interferometer. The interference pattern of the Sagnac interferometer are very sensitive to the path difference of two coherent beam in the destructive interference, at the same time, the optical lever can amplify the beam path difference thus the sensitivity can be improved. Furthermore, the destructive interference of the Sagnac interferometer can suppress some noise source and then the noise performance can be improved. The simulation results show that the proposed precision angle sensor based on the optical lever has high sensitivity and high noise performance.