Title
Fiber-Optic Liquid Level Sensing by Temperature Profiling with an FBG Array.
Abstract
We describe a fiber-optic system to measure the liquid level inside a container. The technique is based on the extraction of the temperature profile of the fiber by using a fiber Bragg grating (FBG) array. When the temperatures of the liquid and the gas are different, the liquid level can be estimated. We present a physical model of the system and the experimental results and we compare different algorithms to extract the liquid level from the temperature profile. We also show how air convection influences the temperature profile and the level of estimation accuracy. We finally show dynamic response measurements which are used to obtain the response time of the sensor. Turbomachinery monitoring is proposed as one possible application of the device.
Year
DOI
Venue
2018
10.3390/s18082422
SENSORS
Keywords
Field
DocType
FBG,optical fiber sensor,liquid level sensor,temperature,distributed temperature sensors
Optical fiber,Profiling (computer programming),Electronic engineering,Engineering,Optoelectronics
Journal
Volume
Issue
Citations 
18
8.0
0
PageRank 
References 
Authors
0.34
2
6