Automated interferometric alignment system for paraboloidal mirr

Details Automated interferometric alignment system for paraboloidal mirr Automated interferometric alignment system for paraboloidal mirr

1991-11-27

1993-09-28

Turner, Samuel A.

Optics: measuring and testing

By polarized light examination

With birefringent element

356352, 356361, 356138, G01B 1126

Patent

active

052490335

ABSTRACT:
A method is described for a systematic method of interpreting interference fringes obtained by using a corner cube retroreflector as an alignment aid when aigning a paraboloid to a spherical wavefront. This is applicable to any general case where such alignment is required, but is specifically applicable in the case of aligning an autocollimating test using a diverging beam wavefront. In addition, the method provides information which can be systematically interpreted such that independent information about pitch, yaw and focus errors can be obtained. Thus, the system lends itself readily to automation. Finally, although the method is developed specifically for paraboloids, it can be seen to be applicable to a variety of other aspheric optics when applied in combination with a wavefront corrector that produces a wavefront which, when reflected from the correctly aligned aspheric surface will produce a collimated wavefront like that obtained from the paraboloid when it is correctly aligned to a spherical wavefront.

REFERENCES:
patent: 3844660 (1974-10-01), Hunter
patent: 4472054 (1984-09-01), Pouit
C. Bond and C. A. Pipan, "How to Align an Off-Axis Parabolic Mirror," Proceedings of the SPIE, vol. 1113, 236-248 (1989).

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