Abstract
This paper discribes a new method for measuring rotation rate with laser interference technology.The methods of measuring angle before have two limitations.One is that the methods can not measure the instantaneous value of rotation rate,the other is that the accuracy ofrotation rate depends on the measuring accuracy oftime and rotation angle.This method in this paper overcomes these shortages,and fulfills dynamic contactiess angle measurement. This system consists of two elastic bodys that fix two pyramid prisms,a rotary table for giving angle, a laser,an optic measuring system and two photo detector received interference fringes.The beam from the laser is devided reflex beam and transmission beam by pyramid prism.The reflex beam is received by photo detector.The transmission beam is reflexed by pyramid prisms that rotate with rotary table,and is received by another photo detector.By comparing the interference fringes that two photo detector received,we can get Doppler frequency difference z f In addition,we can find the relation of the rotation rate and L f. Theoretical analyses and experimental testing fmd that the faster rotation rate is,the higher measurement resolution of rotation rate is.But the distance of elastic body is limited.So,experiment in this paper determines that the highest rotation rate of rotary table is 4.3rad/s.Moreover,in this paper,we analyse errores and give their values that influence experimental results. Keywords:rotation rate,interference,accuracy,measurement
