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

TitleHighly Sensitive Carbon Nanotubes Coated Etched Fiber Bragg Grating Sensor for Humidity Sensing
Publication TypeJournal Article
Year of Publication2014
AuthorsShivananju, BN, Yamdagni, S, Fazuldeen, R, Kumar, AKS, Nithin, SP, Varma, MM, Asokan, S
JournalIEEE Sensors Journal
Date PublishedAug
KeywordsBragg gratings, Bragg wavelength shift, carbon nanotubes, carbon nanotubes coated etched fiber Bragg grating sensor, CNT coated EFBG, Etched fiber Bragg grating sensor, FBG-based humidity sensor, fiber core, Fiber gratings, fibre optic sensors, Humidity, humidity sensing, humidity sensors, linear response, nanosensors, Optical fiber sensors, refractive index, relative humidity sensing, Temperature sensors, water molecules

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  31 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  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.

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