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Highly Sensitive Carbon Nanotubes Coated Etched Fiber Bragg Grating Sensor for Humidity Sensing

Shivananju, Bannur Nanjunda and Yamdagni, Sumeet and Fazuldeen, Ruknudeen and Kumar, Anakkat Koyilothu Sarin and Nithin, Shamraju Purushotham and Varma, Manoj M and Asokan, Sundarrajan (2014) Highly Sensitive Carbon Nanotubes Coated Etched Fiber Bragg Grating Sensor for Humidity Sensing. In: IEEE SENSORS JOURNAL, 14 (8). pp. 2615-2619.

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Official URL: http://dx.doi.org/ 10.1109/JSEN.2014.2312353


The sensing of relative humidity (RH) at room temperature has potential applications in several areas ranging from biomedical to horticulture, paper, and textile industries. In this paper, a highly sensitive humidity sensor based on carbon nanotubes (CNTs) coated on the surface of an etched fiber Bragg grating (EFBG) sensor has been demonstrated, for detecting RH over a wide range of 20%-90% at room temperature. When water molecules interact with the CNT coated EFBG, the effective refractive index of the fiber core changes, resulting in a shift in the Bragg wavelength. It has been possible to achieve a high sensitivity of similar to 31 pm/% RH, which is the highest compared with many of the existing FBG-based humidity sensors. The limit of detection in the CNT coated EFBG has been found to be similar to 0.03 RH. The experimental data shows a linear response of Bragg wavelength shift with increase in humidity. This novel method of incorporating CNTs on to the FBG sensor for humidity sensing has not been reported before.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords: Etched fiber Bragg grating sensor; carbon nanotubes; humidity sensing
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Date Deposited: 06 Feb 2015 15:04
Last Modified: 06 Feb 2015 15:04
URI: http://eprints.iisc.ac.in/id/eprint/50789

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