Extended-length fiber optic carbon dioxide monitoring

Jesus Delgado-Alonso; Robert A. Lieberman

doi:10.1117/12.2019321

31 May 2013 Extended-length fiber optic carbon dioxide monitoring

Jesus Delgado-Alonso, Robert A. Lieberman

Proceedings Volume 8718, Advanced Environmental, Chemical, and Biological Sensing Technologies X; 87180K (2013) https://doi.org/10.1117/12.2019321
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

Abstract

This paper discusses the design and performance of fiber optic distributed intrinsic sensors for dissolved carbon dioxide, based on the use optical fibers fabricated so that their entire lengths are chemically sensitive. These fibers use a polymer-clad, silica-core structure where the cladding undergoes a large, reversible, change in optical absorbance in the presence of CO₂. The local “cladding loss” induced by this change is thus a direct indication of the carbon dioxide concentration in any section of the fiber. To create these fibers, have developed a carbon dioxide-permeable polymer material that adheres well to glass, is physically robust, has a refractive index lower than fused silica, and acts as excellent hosts for a unique colorimetric indicator system that respond to CO₂. We have used this proprietary material to produce carbon-dioxide sensitive fibers up to 50 meters long, using commercial optical fiber fabrication techniques. The sensors have shown a measurement range of dissolved CO₂ of 0 to 1,450 mg/l (0 to 100% CO₂ saturation), limit of detection of 0.3 mg/l and precision of 1.0 mg/l in the 0 to 50 mg/l dissolved CO₂ range, when a 5 meter-long sensor fiber segment is used. Maximum fiber length, minimum detectable concentration, and spatial resolution can be adjusted by adjusting indicator concentration and fiber design.

Citation Download Citation

Jesus Delgado-Alonso and Robert A. Lieberman "Extended-length fiber optic carbon dioxide monitoring", Proc. SPIE 8718, Advanced Environmental, Chemical, and Biological Sensing Technologies X, 87180K (31 May 2013); https://doi.org/10.1117/12.2019321

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