High-resolution liquid level sensor utilizing a microwave photonics interrogated multicore fiber interferometer.
Opt Lett
; 48(23): 6128-6131, 2023 Dec 01.
Article
en En
| MEDLINE
| ID: mdl-38039208
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 ±14â
cm, the proposed liquid level sensor achieves a sensitivity of 10.35â
MHz/cm and an impressive resolution of 0.04835â
cm. The proposed sensor has unique advantages of high sensitivity, superior resolution, long-term stability, etc.
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Opt Lett
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2023
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Article