Affiliation:
1. Yangtze Optical Fiber and Cable Joint Stock Limited Company (YOFC) R&D Center
Abstract
We propose and experimentally demonstrate a high-resolution, high-sensitivity liquid level sensor based on a multicore fiber (MCF) Michelson interferometer (MI), where the sensing fiber is securely affixed to a cantilever beam, such that liquid level variations will change the beam’s curvature, meanwhile leading to a substantial phase difference between the two interfering arms of the MI, and the sensor is interrogated using a microwave photonics filter (MPF) system, which can provide greatly enhanced measurement resolution compared to the traditional optical wavelength demodulation methods. The angular position of the MCF is precisely calibrated to ensure optimal sensitivity of the MI sensor. As a result, within a measurement range of up to ±14 cm, the proposed liquid level sensor achieves a sensitivity of 10.35 MHz/cm and an impressive resolution of 0.04835 cm. The proposed sensor has unique advantages of high sensitivity, superior resolution, long-term stability, etc.
Funder
National Key Research and Development Program of China
JD Project of Hubei Province
National Natural Science Foundation of China
Hubei Province Key Research and Development Program
Fundamental Research Funds for the Central Universities
Natural Science Foundation of Hubei Province
Subject
Atomic and Molecular Physics, and Optics