Optical measuring device

Details Optical measuring device Optical measuring device

1976-02-09

1978-02-21

Clark, Conrad J.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

356153, G01B 902, G01B 1126

Patent

active

040749371

ABSTRACT:
A lens system which has a built-in reference surface and which provides an emerging wavefront of variable radius of curvature useful in a Fizeau interferometer or a differential autocollimator is described. By interposing between the reference surface and the test surface a collimating lens whose distance from the reference surface can be varied, an emerging wavefront is produced whose radius of curvature can be varied from some positive value to infinity to some negative value depending on the distance of the lens from the reference surface. The improvement is particularly valuable in measuring long radius of curvature optical elements and systems.

REFERENCES:
patent: 3028782 (1962-04-01), Bernhardt et al.
patent: 3782829 (1972-06-01), Herriott
Polhemus; C. et al., "Method for Subtracting Phase Errors in an Interferometer", Applied Optics, vol. 10, No. 2, pp. 441-442 (Feb. 1971).

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