Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1991-09-23
1993-02-16
Rosenberger, Richard A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
356127, 356153, 356354, 356363, 356374, G01B 1127
Patent
active
051875390
ABSTRACT:
An apparatus and method are disclosed for characterizing the surface of mirrors in which a cross-grid type phase grating is illuminated from behind by light reflected from the mirror so as to create a grid-like interference pattern when observed along an observation axis. The fringe lines in the generated or observed interference pattern are correlated to the grating and observed for relative displacement from the grating axis. Apparent fringe index numbers for the fringe lines are used to determine coefficients for a plurality of monomial series which are in turn used to derive Zernike coefficients from which a wavefront contour is obtained. In order to reduce alignment errors during analysis, each fringe line is subtracted from the next lower order line and before monomial coefficients are determined. In further embodiments of the invention, the fringe pattern is transferred, using one or more lenses, to an image digitizer such as a CCD camera which is coupled to a digital computation device that analyzes the observed fringes and computes the series coefficients and then translates them into Zernike coefficient values which are used to reconstruct the mirror surface contours.
REFERENCES:
patent: 4692003 (1987-09-01), Adachi et al.
patent: 4818108 (1989-04-01), Eppinger
patent: 5066119 (1991-11-01), Bertrand
patent: 5066120 (1991-11-01), Bertrand
patent: 5076689 (1991-12-01), Adachi
patent: 5080477 (1992-01-01), Adachi
Adachi Iwao P.
Coffman Stephen B.
Hamann H. Fredrick
Montanye George A.
Pham Hoa Q.
Rockwell International Corporation
Rosenberger Richard A.
LandOfFree
Mirror surface characteristic testing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Mirror surface characteristic testing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mirror surface characteristic testing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2151353