title: Rotation angle measurement based on white-light interferometry with a standard optical flat.
abstract: We propose a simple white-light interferometric method of measuring a one-dimensional rotation angle with use of an optical plane parallel plate of standard refractive index. The phase change of the interference pattern of the interferometer during the rotation of the flat plate of known refractive index and thickness placed in one of the interferometer's arms is used for determination of the rotation angle. This method has been demonstrated for an accurate angle measurement over the angle range from 0° to 40° within a maximum uncertainty of 0.057°.
authors.affiliation: Department of Physics, Inha University, 253 Yonghyun-dong, Nam-gu, Incheon 402-751, South Korea.
authors.forename: Hyo Geun
authors.initials: HG
authors.lastname: Yun
authors.forename: Seung Hwan
authors.initials: SH
authors.lastname: Kim
authors.forename: Heung Sun
authors.initials: HS
authors.lastname: Jeong
authors.forename: Kyong Hon
authors.initials: KH
authors.lastname: Kim