In this paper, we propose and demonstrate a novel scheme for simultaneous measurement of liquid level and temperature based on a simple uniform fiber Bragg grating (FBG) by monitoring both the short-wavelength-loss peaks and its Bragg resonance. The liquid level can be measured from the amplitude changes of the short-wavelength-loss peaks, while temperature can be measured from the wavelength shift of the Bragg resonance. Both theoretical simulation results and experimental results are presented. Such a scheme has some advantages including robustness, simplicity, flexibility in choosing sensitivity and simultaneous temperature measurement capability.
- fiber optics sensors
- fiber Bragg gratings
- liquid-level sensor
Shu, X., Sugden, K., & Bennion, I. (2010). Single uniform FBG for simultaneous measurement of liquid level and temperature. Measurement Science and Technology, 21(9), 094003. . https://doi.org/10.1088/0957-0233/21/9/094003