Internal reflectance apparatus and method using cylindrical elem

Details Internal reflectance apparatus and method using cylindrical elem Internal reflectance apparatus and method using cylindrical elem

1989-02-17

1991-01-29

McGraw, Vincent P.

Optics: measuring and testing

Sample, specimen, or standard holder or support

356300, G01N 2101

Patent

active

049881957

ABSTRACT:
An apparatus and method for fluid sample analysis are disclosed which use a cylindrical internal reflectance element (IRE) having conical end surfaces. The divergence of rays inside the IRE is minimized by using reflecting cones at each end of the IRE, the structural elements and their dimensions being such that each entering ray strikes the conical IRE end surface at substantially the same angle of incidence. Means are included for providing optical stops at the large end of both the input and output reflecting cones, in order to eliminate any rays which might travel through the IRE without first being reflected by the input cone. Using such stops and properly dimensioning the entering diameter of the reflecting cone, result in a system in which each ray entering the IRE has been reflected once, and only once, by the reflecting cone.

REFERENCES:
patent: 3370502 (1968-02-01), Wilks, Jr.
patent: 4595833 (1986-06-01), Sting

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