Optics: measuring and testing – For light transmission or absorption
Patent
1996-07-30
1998-03-03
Font, Frank G.
Optics: measuring and testing
For light transmission or absorption
356320, 356317, G01N 2100
Patent
active
057241511
ABSTRACT:
A waveguide sensing element has a substrate having an input opening adapted to house an input optical fiber and an output opening adapted to house an output optical fiber. The input optical fiber transmits electromagnetic radiation, and the output optical fiber emits the electromagnetic radiation. The waveguide sensing element also has a guiding layer disposed adjacent the substrate. The guiding layer has a beveled end face. The angle of the bevel is chosen so that the guiding layer selects only those modes within a given range--i.e., high order modes. This increases the spectral absorption measurement sensitivity as compared to a waveguide sensing element which uses the complete mode spectrum. Such a highly sensitive waveguide sensing element has been found to be particularly useful as an internal reflection spectroscopic sensing element. Moreover, the waveguide sensing element of the present invention is particularly useful in a process environment, where the corrosive effects of chemicals make on-line spectral absorption measurements difficult. Thus, the waveguide sensing element of the present invention may be rear-fired, which is particularly attractive from a process seal integrity standpoint.
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Oren Moshe
Perrotto Joseph Anthony
Riegert Ronald Jack
Ryley James Francis
E.I. Du Pont de Nemours and Company
Font Frank G.
Hamby Jane Obee
Ratliff Reginald A.
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