A kind of improvement line-of-sight course for roundness error measurement

One kind being used for turn error, three point methods of improvement of roundness error measurement, first by three displacement sensor distributing installations in the circular runout of different angular position measurement check bars, sensor measurement is recorded with high-frequency data acquisition system, then with each harmonic wave Fourier coefficient of three point tolerance isolation technics Calculation of Roundness Error, second and/or third sensor are re-installed in different angles again, it is multiple to repeat line-of-sight course measurement, in this way, multiple estimated values can be obtained in each Fourier coefficient, screening is most accurate Fourier coefficient estimated value by the Fourier coefficient that the maximum transfer matrix of determinant is calculated, finally by most accurate Fourier coefficient estimated value composite calulation deviation from circular from, the present invention improves the accuracy of each harmonic wave estimation, thus the accuracy of entire roundness error measurement is improved.