Interferometer

Details Interferometer Interferometer

1978-11-30

1981-01-06

Corbin, John K.

Optics: measuring and testing

By particle light scattering

With photocell detection

356352, 356358, G01B 902

Patent

active

042433231

ABSTRACT:
An interferometer of relatively simple design which is tilt compensated, and which facilitates adjustment of the path lengths of split light beams. The interferometer includes a pair of plate-like elements with a dielectric coating and an oil film between them, that forms a beamsplitter interface, and with a pair of reflector surfaces at the ends of the plates. A pair of retroreflectors are positioned so that each split beam component is directed by a retroreflector onto one of the reflector surfaces and is then returned to the beamsplitter interface, so that the reflector surfaces tilt in a direction and amount that compensates for tilting of the beamsplitter interface. The oil film is less than about 20 microinches thick, to pass approximately equal amounts of all wavelengths longer than the film thickness, and yet to provide a sliding surface that enables one plate to shift relative to the other. The plate-like elements are slightly tapered to avoid channeling effects.

REFERENCES:
patent: 3109049 (1963-10-01), Williams
patent: 3704934 (1972-12-01), Holmes et al.
patent: 3809481 (1974-05-01), Schindler

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