Reflectometer optical system

Details Reflectometer optical system Reflectometer optical system

1976-03-23

1977-05-10

Corbin, John K.

Optics: measuring and testing

Photometers

G01N 2148

Patent

active

040225348

ABSTRACT:
A reflectometer optical system having an optical axis for illuminating a sample with flux derived from an extended source such as a pulsed xenon flashtube. A wedge-shaped diffuser, symmetric with respect to the optical axis, is used to diffuse the flux emanating from the source and refract it radially outward from the optical axis. The polished inner surface of a cylinder is used to reflect these radially expanding rays such that they converge upon the sample area from all azimuth angles. A series of baffles are located between the diffuser and the sample to limit the flux incident upon the sample to a small angular spread about 45.degree.. A lens located along the optical axis focuses the flux diffusely reflected from the sample onto one end of a fiber optical bundle. An aperture stop disposed between the lens and the sample limits the reflected flux to a small angular spread about 0.degree. while the end of the fiber optic bundle serves as a field stop to limit the region of the sample from which reflcted light is collected.

REFERENCES:
patent: 2311101 (1943-02-01), Tuttle et al.
patent: 3792268 (1974-02-01), Bjerke et al.
patent: 3918814 (1975-11-01), Weiser

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