We demonstrate a multichannel fiber Bragg grating (MC-FBG) based distributed temperature field sensor with millimeter-order spatial resolution. The MC-FBG was designed by using the layer peeling (LP) algorithm with a tailored group delay characteristic and fabricated using seamless UV-inscription. We have achieved a 21-channel MC-FBG with 0.2 nm bandwidth of each channel and 0.5 nm channel gap. The sensor was tested by using a temperature field distribution. Experimental results show that the sensor had a spatial resolution of 3 mm and could measure a maximum temperature gradient of 7.85 °C/mm.
Bibliographical note© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
- Fibre Bragg grating
- sensing temperature
- sensor grating
Gbadebo, A., Turitsyna, E., Williams, J. A., Zhang, L., Sun, Y., Zhang, W., Yan, Z., Sun, Q., & Liu, D. (2019). Multichannel fiber Bragg grating for temperature field monitoring. Optics Express, 27(2), 461-469. https://doi.org/10.1364/OE.27.000461