Intrinsic fiber optic absorption sensor for the detection of volatile organic compounds

Gregory L. Klunder; Robert J. Silva; Richard E. Russo

doi:10.1117/12.170664

10 March 1994 Intrinsic fiber optic absorption sensor for the detection of volatile organic compounds

Gregory L. Klunder, Robert J. Silva, Richard E. Russo

Proceedings Volume 2068, Chemical, Biochemical, and Environmental Fiber Sensors V; (1994) https://doi.org/10.1117/12.170664
Event: Optical Tools for Manufacturing and Advanced Automation, 1993, Boston, MA, United States

Abstract

A core-based intrinsic fiber optic absorption sensor has been developed for the detection of volatile organic compounds. The sensor can detect organics in aqueous solutions or in the vapor phase without a chemical reaction. The distal ends of transmission and receiving fibers are connected by a small section of an optically clear silicone rubber. The silicone rubber section acts both as a lightpipe and as a selective membrane into which the analyte molecules can diffuse. Absorption spectra obtained in the nearinfrared (NIR) provide qualitative and quantitative information about the analyte. Water, which has strong broadband absorption in aqueous solutions of the NIR, is excluded from the spectra due to the hydrophobic properties of the silicone rubber. In a stirred solution, the sensor reaches equilibrium in approximately 10 minutes. The current limit of detection is 1.0 ppm for TCE in an aqueous solution.

Citation Download Citation

Gregory L. Klunder, Robert J. Silva, and Richard E. Russo "Intrinsic fiber optic absorption sensor for the detection of volatile organic compounds", Proc. SPIE 2068, Chemical, Biochemical, and Environmental Fiber Sensors V, (10 March 1994); https://doi.org/10.1117/12.170664

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