Journal
OPTICS LETTERS
Volume 45, Issue 1, Pages 169-172Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.45.000169
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Funding
- National Key RAMP
- D Program of China [2018YFB2100902]
- National Natural Science Foundation of China (NSFC) [61775072, 61922033]
- Creative Research Groups of the Natural Science Foundation of Hubei [2018CFA004]
- WuhanMorning Light Plan of Youth Science and Technology [2017050304010280]
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Increasing the sensitivity and miniaturizing the size of liquid-level sensors are crucial for confined installation space. Here we propose and demonstrate a highly sensitive liquid-level sensor based on a compact optical reflective microfiber probe. By tracking the resonant wavelength shift of the in-line Mach-Zehnder interferometer generated between the HE11 and HE12 modes, liquid-level sensing can be realized. Through optimizing the structure parameters of the microfiber probe, an ultra-high sensitivity of similar to 367.644 nm/mm is achieved in experiment, which is two to three orders of magnitude higher than other reported liquid-level sensors, to the best of our knowledge. Considering the high sensitivity and compact structure of the sensor, it has great potential in real-time intelligent monitoring of tiny changes in the liquid level such as small autonomous drones and micro-channels. (C) 2019 Optical Society of America
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