title: Improved technique for measuring small angles.
abstract: Based on the total-internal-reflection effect and heterodyne interferometry, an improved technique for measuring small angles is proposed. This technique not only expands the measurement range but it also improves measurement performances. Its validity is demonstrated.
authors.forename: M H
authors.initials: MH
authors.lastname: Chiu
authors.forename: D C
authors.initials: DC
authors.lastname: Su