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Proceedings Paper

New small-diameter fiber optic absorbance sensor for continuous spectral scanning
Author(s): David A. Landis; Carl J. Seliskar
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Paper Abstract

A new efficient fiber optic absorbance sensor is described. The sensor can be configured with optical pathlengths from a few millimeters to 10 cm while maintaining high throughput. The sensor contains a graded index (GRIN) microlens which is ground for a specific sensor optical configuration. The sensor is able to be configured in several diameters ranging from sizes that fit within clinically acceptable gauge hypodermic needles to several millimeter diameter sizes. The sensor has currently been tested for the near-UV-VIS and near-IR spectral regions. Optical test results for several sensor sizes are presented and compared to sensor configurations described previously in the literature. A brief analysis of the sensor design is given in terms of the physical optics of the graded-index lens/multimode fiber optic couples which lead to high optical efficiencies. Example numerical simulations of the sensor optical efficiency are presented and compared with experimental results. Sample spectra and performance results also are presented.

Paper Details

Date Published: 21 July 1994
PDF: 9 pages
Proc. SPIE 2136, Biochemical Diagnostic Instrumentation, (21 July 1994); doi: 10.1117/12.180801
Show Author Affiliations
David A. Landis, Univ. of Cincinnati (United States)
Carl J. Seliskar, Univ. of Cincinnati (United States)

Published in SPIE Proceedings Vol. 2136:
Biochemical Diagnostic Instrumentation
Robert F. Bonner; Gerald E. Cohn; Thomas M. Laue; Alexander V. Priezzhev, Editor(s)

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