Conference paper
Sensitivity enhancement using annealed polymer optical fibre based sensors for pressure sensing applications
Aston University1
Fibers & Nonlinear Optics, Department of Photonics Engineering, Technical University of Denmark2
Department of Photonics Engineering, Technical University of Denmark3
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark4
Department of Informatics and Mathematical Modeling, Technical University of Denmark5
Thermal annealing can be used to induce a permanent negative Bragg wavelength shift for polymer fibre grating sensors and it was originally used for multiplexing purposes. Recently, researchers showed that annealing can also provide additional benefits, such as strain and humidity sensitivity enhancement and augmented temperature operational range.
The annealing process can change both the optical and mechanical properties of the fibre. In this paper, the annealing effects on the stress and force sensitivities of PMMA fibre Bragg grating sensors are investigated. The incentive for that investigation was an unexpected behaviour observed in an array of sensors which were used for liquid level monitoring.
One sensor exhibited much lower pressure sensitivity and that was the only one that was not annealed. To further investigate the phenomenon, additional sensors were photo-inscribed and characterised with regard their stress and force sensitivities. Then, the fibres were annealed by placing them in hot water, controlling with that way the humidity factor.
After annealing, stress and force sensitivities were measured again. The results show that the annealing can improve the stress and force sensitivity of the devices. This can provide better performing sensors for use in stress, force and pressure sensing applications.
| Language: | English |
|---|---|
| Publisher: | SPIE - International Society for Optical Engineering |
| Year: | 2016 |
| Pages: | 99160E-99160E-4 |
| Proceedings: | 6th European Workshop on Optical Fibre Sensors |
| Series: | Proceedings of Spie - the International Society for Optical Engineering |
| ISBN: | 1510602194 and 9781510602199 |
| ISSN: | 1996756x and 0277786x |
| Types: | Conference paper |
| DOI: | 10.1117/12.2236877 |
| ORCIDs: | Bang, Ole |
Annealing Applied Mathematics BRAGG GRATINGS Bragg gratings Bragg wavelength shift Computer Science Applications Condensed Matter Physics Electrical and Electronic Engineering Electronic, Optical and Magnetic Materials Fiber Bragg gratings Fibers Fibre Bragg grating sensors Fibre optic sensors Fibre optic sensors; fibre gyros Force sensitivity HUMIDITY Humidity control Liquid level monitoring Measurement of mechanical variables Mechanical variables measurement Nanofibers OPTICS Optical and mechanical properties Optical fibers PHYSICS, PMMA fibre Bragg grating sensors POF Plastic optical fibers Polymer fibres Polymers Pressure and vacuum measurement Pressure measurement Pressure sensors STRAIN Sensitivity enhancements Stress sensor Stress sensors annealed polymer optical fibre based sensors annealing fibre optic sensors force sensitivity force sensors hot water humidity factor liquid level monitoring multiplexing optical polymers permanent negative Bragg wavelength shift polymer fibre grating sensors polymer fibres pressure sensing applications pressure sensors sensitivity enhancement sensor array sensor arrays stress sensitivity stress sensors thermal annealing
