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Humidity Responsive Photonic Sensor based on a Carboxymethyl Cellulose Mechanical Actuator
preprintsubmitted on 12.10.2017, 13:20 and posted on 16.10.2017, 15:19 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.
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in Sensors and Actuators B: Chemical
- Thin Films