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Humidity Responsive Photonic Sensor based on a Carboxymethyl Cellulose Mechanical Actuator

preprint
submitted on 12.10.2017 and posted on 16.10.2017 by Matthew Hartings, Kevin O. Douglass, Claire Neice, Zeeshan Ahmed
We describe an intuitive and simple method for exploiting humidity-driven volume changes in carboxymethyl cellulose (CMC) to fabricate a humidity responsive actuator on a glass fiber substrate. We optimize this platform to generate a photonic-based humidity sensor where CMC coated on a fiber optic containing a fiber Bragg grating (FBG) actuates a mechanical strain in response to humidity changes. The humidity-driven mechanical deformation of the FBG results in a large linear change in Bragg resonance wavelength over the humidity range of 5 %RH (relative humidity) to 40 %RH. The measurement uncertainty over this range is ± 2 %RH.

History

Topic

  • Thin Films

Email Address of Submitting Author

hartings@american.edu

Email Address(es) for Other Author(s)

kevin.douglass@nist.gov cneice8@vt.edu zeeshan.ahmed@nist.gov

Institution

National Institute of Standards and Technology

Country

USA

ORCID For Submitting Author

0000-0003-0658-939X

Declaration of Conflict of Interest

no conflict of interest

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in Sensors and Actuators B: Chemical

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