title: Absolute distance measurement by lateral shearing interferometry of point-diffracted spherical waves.
abstract: We describe a method of absolute distance measurement based on the lateral shearing interferometry of point-diffracted spherical waves. A unique feature is that the distance measurement is not confined only along a single line of the optical axis, but the target is allowed to take movement freely within a volumetric measurement space formed by the aperture angle of point-diffraction. Detailed measurement theory is explained along with experimental verification.
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Chu
authors.forename: Seung-Woo
authors.initials: SW
authors.lastname: Kim