Simultaneous measurement of humidity and temperature by combining a reflective intensity-based optical fiber sensor and a fiber Bragg grating

A novel sensor capable of simultaneously measuring temperature and humidity has been fabricated and demonstrated using optical fiber waveguides. The sensor head is composed of a fiber Bragg grating and a low-finesse Fabry-Perot interferometric cavity. The Fabry-Perot cavity was fabricated using the electrostatic self-assembled monolayer process for the molecular-level deposition of materials of different thicknesses that form a humidity-sensitive coating on the end of the fiber, while the in-line Bragg grating fiber element is used to monitor temperature. Experimental results for a humidity range from 11% to 97% RH and for a temperature range from 10/spl deg/C to 85/spl deg/C are shown.

[1]  Richard O. Claus,et al.  Novel Polymer Dyes for Nonlinear Optical Applications Using Ionic Self‐Assembled Monolayer Technology , 1998 .

[2]  Gero Decher,et al.  Fuzzy Nanoassemblies: Toward Layered Polymeric Multicomposites , 1997 .

[3]  R O Claus,et al.  Fabrication of microgratings on the ends of standard optical fibers by the electrostatic self-assembly monolayer process. , 2001, Optics letters.

[4]  I. J. Wilkinson.  Wear-out failure mechanism in fused-fibre couplers , 1993 .

[5]  Richard O. Claus,et al.  Ionic Self‐Assembly of Ultrahard ZrO2/Polymer Nanocomposite Thin Films , 1998 .

[6]  R O Claus,et al.  Optical fiber nanometer-scale Fabry-Perot interferometer formed by the ionic self-assembly monolayer process. , 1999, Optics letters.

[7]  Claude Delpha,et al.  An electronic nose for the identification of Forane R134a in an air conditioned atmosphere , 2000 .

[8]  K. Watanabe,et al.  A low-cost, compact indoor thermal environment monitor , 2000, Proceedings of the 17th IEEE Instrumentation and Measurement Technology Conference [Cat. No. 00CH37066].

[9]  Marenori Kawamura,et al.  HUMIDITY AND TEMPERATURE SENSING USING AN OPTICAL FIBER AND A CORNER CUBE PRISM , 1999 .

[10]  R. Claus,et al.  Optical fiber humidity sensor using a nano Fabry–Perot cavity formed by the ionic self-assembly method , 1999 .

[11]  J. Senior.  Optical Fiber Communications , 1992 .

[12]  A. Othonos.  Fiber Bragg gratings , 1999 .

[13]  Richard O. Claus,et al.  Optical Fiber Humidity Sensor with a Fast Response Time Using the Ionic Self-Assembly Method , 2000 .

[14]  R. Eichler,et al.  Multiple-sensor micro-system for pulmonary function diagnostics for COPD and asthma patients , 2000, 1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451).

[15]  L. J. Kangas,et al.  Electronic noses and their applications in environmental monitoring , 1995 .

[16]  K. Hill,et al.  Fiber Bragg grating technology fundamentals and overview , 1997 .

[17]  Richard O. Claus,et al.  Layer-by-layer electrostatic self-assembly of nanoscale Fe3O4 particles and polyimide precursor on silicon and silica surfaces , 1997 .