16 May 2007 Bio-chemical sensor based on imperfected plastic optical fiber
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In this paper we report results for an intrinsic evanescent field sensor based on not-regular plastic optical fiber with polymer film containing Malachite Green MG+([PhC(C6H4NMe2)3]+) as an absorption reagent, which coats the fiber's imperfected area. A theoretical model was developed which shows that changes of light in such structure result from the attenuation of light in the strait and bent imperfected fiber. In this model, the imperfected area with malachite green polymer film is replaced by a uniform layer with a complex refractive index. The changes in color and absorption characteristics of the polymer film depend on the acidic and basic environmental properties in the sensing area. Additional increase of the evanescent field interaction can be achieved by decrease the bending radius of the fiber with the coated imperfection area at the middle of the bent fiber. An imperfected plastic optical fiber with Malachite Green coating has been presented for the detection of ammonia vapor. The initial results show that depending on the sensing application demands, it is possible to design a high sensitive sensor with a relatively long response time, while when the demands require fast response times the sensor with less sensitivity can be used. In addition, the sensors' sensitivity can be calibrated in real-time by changing the bending radius.
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Anatoly Babchenko, Valeri Chernyak, Jonathan Maryles, "Bio-chemical sensor based on imperfected plastic optical fiber", Proc. SPIE 6585, Optical Sensing Technology and Applications, 65851V (16 May 2007); doi: 10.1117/12.722911; https://doi.org/10.1117/12.722911

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