Multiple internal reflection analyzers not requiring external op

Details Multiple internal reflection analyzers not requiring external op Multiple internal reflection analyzers not requiring external op

1995-09-18

1997-03-04

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

257416, 257246, 25033912, 2503411, 2503418, G01N 2127

Patent

active

056085184

ABSTRACT:
Multiple internal reflection, MIR, rods or internal reflection elements, IRE, use the principal of frustrated total internal reflection, FTIR, (also known as attenuated total reflection, ATR,) in infrared spectroscopy, spectrometers, and spectrophotometers. The rods have polished ends which may be wedges with parallel apexes intersecting the optical axis of the rod. One wedge is convex and the other concave. The concave may be a cone with the axis of the cone coincident with the optical axis of the rod. The angle of the concave wedge or the apex of the cone is slightly greater than twice the critical angle of incidence of the wavelengths to be used for optical analysis incident on the inner surface of the rod when immersed in a material to be analyzed. The angle of the apex of the convex wedge is slightly less than twice 90.degree. minus the critical angle.

REFERENCES:
patent: 3998591 (1976-12-01), Eckfeldt
patent: 4595833 (1986-06-01), Sting

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