Humidity Responsive Photonic Sensor based on a Carboxymethyl Cellulose Mechanical Actuator

Published: July 15, 2018


Matthew R. Hartings, Kevin O. Douglass, 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 over the humidity range of 5 %RH (relative humidity) to 40 %RH. The measurement uncertainty over this range is only ± 2 %RH.
Citation: Sensors and Actuators B-Chemical
Pub Type: Journals

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humidity, photonics, FBG, moisture, cellulose
Created July 15, 2018, Updated April 06, 2018