17 May 2012 Experimental study of plastic optical fiber TNT sensor based on evanescence absorption
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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.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Fenghong Chu, "Experimental study of plastic optical fiber TNT sensor based on evanescence absorption," Optical Engineering 51(5), 054403 (17 May 2012). https://doi.org/10.1117/1.OE.51.5.054403 . Submission:
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