Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7135308 | Sensors and Actuators A: Physical | 2016 | 16 Pages |
Abstract
A novel liquid level fiber sensor based on self-imaging properties of the multimode interference (MMI) in no core fiber (NCF) is proposed and demonstrated. Based on the beam propagation method (BPM) simulation, a NCF of optimal length is selected to act as a sensing head and tunable filter in a ring cavity fiber laser. For high liquid level sensing, a height conversion setup based on atmospheric pressure balance principle is designed and the sensitivity is magnified 5 times. A 50Â cm range of liquid level can be detected by monitoring the peak wavelength shift of output laser. The sensor exhibits an excellent linear response (R2Â =Â 0.9999) and a sensitive response to different liquid refractive index (RI). The sensitivity of the single mode-no core- single mode (SNS) sensor is 108.8Â pm/mm and the accuracy is about 1% at the resolution of 0.1Â nm of detection using an OSA with the liquid RI of 1.4152, which is the highest accuracy for a 50Â cm liquid level range to our best knowledge.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yanli Ran, Li Xia, Dikai Niu, Yongqiang Wen, Can Yu, Deming Liu,