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The Effect of Length and Diameter on the Signal-to-Noise Ratio of Evanescent Field Absorption Fiber-Optic Sensors

Volume 46, Number 7 (July 1992) Page 1129-1133

Colin, T.B.; Yang, K.H.; Arnold, M.A.; Small, Gary W.; Stwalley, W.C.


This paper discusses the theoretical and experimental implications of changing the length and diameter of the evanescent field sensing region of an evanescent field sensor. Particular emphasis is placed on optimizing the intensity of the evanescent field for near-infrared sensor applications. Both theoretical and experimental results show that an optimal length and diameter must be determined experimentally for each analyte system.