3D printed long period gratings and their applications as high sensitivity shear-strain and torsion sensors
Ricardo Oliveira, Rogério N. Nogueira, Lúcia Bilro
Abstract
In this work we demonstrate the capability to measure shear-strain and torsion loads by bonding an optical fiber to a 3D printed periodic grooved plate. The device acts as a long period grating where the resonances show loss tunability ranging from ∼0 up to ∼20 dB, achieving sensitivities values for the dip transmission ratio as function of the load of 0.12 /mε and 0.21/deg, for shear-strain and torsion loads ranging from 0-∼8 mε and 1-∼4 deg, respectively. The low wavelength drift allowed us to operate the sensor through intensity demodulation techniques, showing good tracking performance of external stimuli.
Topics & Concepts
Materials scienceTorsion (gastropod)OpticsRangingDemodulationFiber Bragg gratingWavelengthGratingFiber optic sensorDiffraction gratingOptoelectronicsOptical fiberPhysicsTelecommunicationsSurgeryChannel (broadcasting)Computer scienceMedicineAdvanced Fiber Optic SensorsPhotonic and Optical DevicesAdvanced Fiber Laser Technologies