Optical Fiber Humidity Sensor with a Fast Response Time Using the Ionic Self-Assembly Method

Francisco J. ARREGUI  Kristie L. COOPER  Yanjing LIU  Ignacio R. MATIAS  Richard O. CLAUS  

IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.360-365
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Chemical, Environmental, Biochemical and Medical Sensors
humidity sensor,  optical fiber,  ionic self-assembly monolayer,  Fabry-Perot,  

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An optical fiber humidity sensor was fabricated forming a nanometer-scale Fabry-Perot interferometer by using the Ionic Self-Assembly Monolayer (ISAM) method. The materials used were Poly R-478 and poly(diallyldimethyl ammonium chloride). Taking advantage of the precision that the ISAM method can achieve in controlling the length of the nano cavity, the length was fit to obtain a maximum variation of 8.7 dB of reflected optical power between 11.3% and 85% RH. The sensor exhibited a fast response time and was able to monitor the human breathing.