| 摘要 |
A method of calculating a geometrical distance of a test optical path on the basis of interfering a test beam and a reference beam includes an optical-path-length calculating step of calculating an optical path length of the test optical paths having different wavelengths by using the interfering beam having mutually different wavelengths, a refractive-index calculating step of calculating the refractive index of the test optical path on the basis of the optical path length of the test optical path calculated by the optical-path-length calculating step, a smoothing step of smoothing a plurality of refractive indices acquired by repeating the optical-path-length calculating step and the refractive-index calculating step to calculate a smoothed refractive index, and a geometrical distance calculating step of calculating the geometrical distance of the test optical path on the basis of the smoothed refractive index calculated by the smoothing step. |
