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Liquid-level sensing by a cylindrical piezoelectric resonator operating in a trapped-energy mode

A new configuration is presented for detecting a small-scale variation in liquid level. Here, a piezoelectric cylindrical resonator operating in a trapped-energy mode is employed instead of the plate-type resonators such as used in the former studies. It has been confirmed that steep variations in G on the dipping depth d is observed in the evanescent-field range.