Interferometric method for optically testing an object with an a

Details Interferometric method for optically testing an object with an a Interferometric method for optically testing an object with an a

1995-05-24

1997-04-29

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

G01B 902

Patent

active

056254547

ABSTRACT:
A method for testing an object with an aspherical surface. Based on the theory that an aspherical surface is composed of a plurality of spherical surfaces with different radii, the method tests the profile of said aspherical object by positioning the focus of an interferometer on the curvature centers of the plurality of spherical surfaces, recording the relative displacement of the aspherical object and the referenced spherical surfaces and calculating the aberrations therebetween.

REFERENCES:
patent: 4743117 (1988-05-01), Kitabayashi et al.
patent: 5004346 (1991-04-01), Kohel
patent: 5416586 (1995-05-01), Tronolone et al.
"Profile Measurement of an Aspheric Cylindrical Surface From Retroreflection", Ding-tin Lin, et al., Applied Optics, vol. 30, No. 22, Aug. 1991, pp. 3200-3204.

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