Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1998-04-06
1999-11-23
Turner, Samuel A.
Optics: measuring and testing
By particle light scattering
With photocell detection
25033911, G01N 2101, G01B 902
Patent
active
059910291
ABSTRACT:
A sample immersion probe is disclosed which has an ATR (attenuated total reflectance) element at its tip. The ATR is so shaped that radiation exiting the probe will travel in paths parallel to radiation entering the probe. The angles of incidence of radiation on the ATR surface (or surfaces) which permit partial absorption by the sample material are greater than 45.degree.. At least one of the ATR surfaces in contact with the sample has a fully reflecting coating which prevents radiation absorption by the sample at that location. The ATR shape may be symmetrical or non-symmetrical with respect to the axis of symmetry of the probe. The radiation entering the probe may be in a separate light guide (i.e., path) from the radiation exiting the probe; or the entering and exiting radiation may be in the same light guide (path).
REFERENCES:
patent: 3591287 (1971-07-01), Hannis
patent: 4829186 (1989-05-01), McLachlan et al.
patent: 5326972 (1994-07-01), Codella
patent: 5773825 (1998-06-01), Doyle
Internal Reflection Spectroscopy, N.J. Hendrick, Mar. 1971, pp. 89-145.
Axiom Analytical, Inc.
Plante Thomas J.
Turner Samuel A.
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