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Proceedings Paper

Increasing lifetimes of fiber-optic sensor arrays for chemical warfare detection
Author(s): Sandra Bencic; David R. Walt
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Paper Abstract

We are exploring the ability of cross reactive sensor arrays to monitor the presence of chemical warfare agents. The sensing platform developed in our lab uses a variety of fluorescent microbead sensors, either 3 or 5 microns in diameter. The sensors have a wide range of surface functionalities and are coated with fluorescent dyes that change their emission properties upon interaction with analyte vapors. Every time the sensors are interrogated with light they photobleach which leads to signal loss and a decreased array lifetime. In order to monitor for long periods of time, a strategy has been developed that extends the array lifetime. Here, we implement a method to increase the lifetime of an array by up to 10-fold, as we incrementally expose small sections of the array at a time. We divide the array into sections by moving an optical slit across the face of the fiber.

Paper Details

Date Published: 8 March 2004
PDF: 6 pages
Proc. SPIE 5269, Chemical and Biological Point Sensors for Homeland Defense, (8 March 2004); doi: 10.1117/12.516085
Show Author Affiliations
Sandra Bencic, Tufts Univ. (United States)
David R. Walt, Tufts Univ. (United States)

Published in SPIE Proceedings Vol. 5269:
Chemical and Biological Point Sensors for Homeland Defense
Arthur J. Sedlacek; Richard Colton; Tuan Vo-Dinh, Editor(s)

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