Chromatic compensation in Fizeau interferometer

Details Chromatic compensation in Fizeau interferometer Chromatic compensation in Fizeau interferometer

2007-06-22

2009-08-25

Lee, Hwa (Andrew) S (Department: 2886)

Optics: measuring and testing

By light interference

For dimensional measurement

Reexamination Certificate

active

07580135

ABSTRACT:
The focus of the collimating lens in the optical train of a Fizeau interferometer is adjusted to change the power of the test beam illuminating the transmission sphere. As a result, the rays can be made sufficiently perpendicular to the reference surface to eliminate the chromatic focus shift and non-common path errors produced by a light source of wavelength different from the design wavelength of the transmission sphere. By making the position of the collimating lens relative to the beam expander adjustable along the optical axis over some small range, illumination sources of various wavelength can be used in the same interferometer.

REFERENCES:
patent: 5416586 (1995-05-01), Tronolone et al.
patent: 7012700 (2006-03-01), De Groot et al.
patent: 2006/0221350 (2006-10-01), Murphy et al.

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