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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
Publication Date: 2000/03/25
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,
Full Text: PDF(725KB)>>
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.