title: Theoretical fringe profiles with crossed Babinet compensators in testing concave aspheric surfaces.
abstract: This paper presents the theory for the use of crossed Babinet compensators in testing concave aspheric surfaces. Theoretical fringe profiles for a sphere and for an aspheric surface with primary aberration are shown. Advantages of this method are discussed.
authors.affiliation: Indian Institute of Astrophysics, Bangalore- 560 034, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Saxena
authors.forename: J P
authors.initials: JP
authors.lastname: Lancelot