TY - JOUR

T1 - Evaluation of polymer-based eccentric FBG bending sensor for humidity, strain, temperature and torsion

AU - Leffers, Lennart

AU - Roth, Bernhard

AU - Overmeyer, Ludger

N1 - Funding Information: Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation ( OV 36/43-1 )). B. Roth and L. Overmeyer acknowledge funding from the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453).

PY - 2023/7

Y1 - 2023/7

N2 - We analyse and evaluate the sensitivity and robustness of an eccentric fiber Bragg grating sensor micro-structured into a polymer optical fiber under different relative humidity, temperature, strain and torsion conditions. Relative humidity and temperature conditions are established with a climate test chamber and prepared salt solutions. Though made of polymer, the cross-sensitivity of the sensor to relative humidity is low, enabling usage in rapidly changing environment applications, e.g., for movement detecting gloves or in vehicles, but also in high moisture situations. We find a linear dependence on temperature, so that either bending or temperature can be measured separately from each other. After rotation of one end, the sensor measures torsion by observing the light intensity and the change of the full width at half maximum. Strain measurement shows multiple elastic strain regions before final plastic deformations occur. In the next step, the flexible sensor system will be implemented in a sensor glove to monitor finger movement and detect different hand gestures.

AB - We analyse and evaluate the sensitivity and robustness of an eccentric fiber Bragg grating sensor micro-structured into a polymer optical fiber under different relative humidity, temperature, strain and torsion conditions. Relative humidity and temperature conditions are established with a climate test chamber and prepared salt solutions. Though made of polymer, the cross-sensitivity of the sensor to relative humidity is low, enabling usage in rapidly changing environment applications, e.g., for movement detecting gloves or in vehicles, but also in high moisture situations. We find a linear dependence on temperature, so that either bending or temperature can be measured separately from each other. After rotation of one end, the sensor measures torsion by observing the light intensity and the change of the full width at half maximum. Strain measurement shows multiple elastic strain regions before final plastic deformations occur. In the next step, the flexible sensor system will be implemented in a sensor glove to monitor finger movement and detect different hand gestures.

KW - Fiber Bragg gratings

KW - Fiber optics

KW - Optical bend sensor

KW - Polymer optical fiber

KW - Strain sensor

KW - Temperature sensor

KW - Torsion sensor

KW - UV excimer laser

UR - http://www.scopus.com/inward/record.url?scp=85163675084&partnerID=8YFLogxK

U2 - 10.1016/j.optlaseng.2023.107568

DO - 10.1016/j.optlaseng.2023.107568

M3 - Article

AN - SCOPUS:85163675084

VL - 166

JO - Optics and lasers in engineering

JF - Optics and lasers in engineering

SN - 0143-8166

M1 - 107568

ER -