Rotatable shear plate interferometer

Details Rotatable shear plate interferometer Rotatable shear plate interferometer

1986-09-26

1988-11-22

LaRoche, Eugene R.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

356363, G01B 902

Patent

active

047861754

ABSTRACT:
A rotatable shear plate interferometer comprises a transparent shear plate mounted obliquely in a tubular supporting member at 45.degree. with respect to its horizontal center axis. This tubular supporting member is supported rotatably around its center axis and a collimated laser beam is made incident on the shear plate along this center axis such that defocus in different directions can be easily measured.

REFERENCES:
patent: 3345912 (1967-10-01), Lohmann
patent: 3912394 (1975-10-01), Kelsall
Murty et al, "Rotational-Shearing Interferometry", Applied Optics, vol. 5, No. 4, Apr. 1966, pp. 615-618.
Greenaway et al, "A 180.degree. Rotation Shearing . . . Efficiency", Optics Communications, vol. 32, No. 1, Jan. 1980, pp. 48-50.
Harrison, "Cosine Error-Detection Apparatus", IBM Tech. Disclosure Bulletin, vol. 15, No. 3, Oct. 1972, pp. 1477-1478.

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