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Optical Engineering

Experimental study of plastic optical fiber TNT sensor based on evanescence absorption
Author(s): Fenghong Chu
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Paper Abstract

Here, the concentration of TNT was detected by using evanescent absorption method, U-shaped plastic optical fiber was used as sensor head and light transmit element. A high brightness blue light-emitting diode with spectrum centered at 470 nm was used as excitation source. The relationship between the transmitted light power of U-shaped sensor head and TNT concentration was linearly and the linear coefficient was 0.944. The system showed excellent reversibility when the sensor tested by alternately cycling between 0 and 25  mg/100  ml TNT solution in five cycles. The stability of the sensor head in 25  mg/100  ml TNT solution was also tested within two hours. The proposed sensor is a cost-effective alternative to traditional TNT sensors and provides a platform for other optically based sensors.

Paper Details

Date Published: 17 May 2012
PDF: 4 pages
Opt. Eng. 51(5) 054403 doi: 10.1117/1.OE.51.5.054403
Published in: Optical Engineering Volume 51, Issue 5
Show Author Affiliations
Fenghong Chu, Shanghai Univ. of Electric Power (China)

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