Piezoelectric type torsional wave transducer and piezoelectric transduction type magnetostrictive sensor

Abstract

The invention discloses a piezoelectric transduction type magnetostrictive sensor used for liquid level (displacement) measurement and a piezoelectric type torsional wave transducer thereof. The piezoelectric type torsional wave transducer comprises a waveguide wire, the output section of the waveguide wire is provided with an amplification rod, and the ends of the amplification rod are connectedwith piezoelectric elements. After a torsional wave signal is transmitted to the amplification rod through the waveguide wire and is amplified, the torsional wave signal is converted into an electricsignal and output. A normal line of each piezoelectric element is vertical to the waveguide wire and the amplification rod. The amplification rod converts circumferential torsional waves transmitted by the waveguide wire into distortion approximate to a linear direction on the normal line of each piezoelectric element so as to act on the piezoelectric elements to generate charges. Two ends of theamplification rod are respectively provided with the piezoelectric elements with same polar directions, and the piezoelectric elements can simultaneously generate differential piezoelectric signals. The piezoelectric type torsional wave transducer has the advantages that the commonly-used piezoelectric ceramic plates of a thickness oscillating mode are used as the piezoelectric elements, thus thecost is low; the transducer has simple structure and simplified process; and the piezoelectric elements can be used for directly converting mechanical signals into voltage signals, thus the advantages of fewer links and high sensitivity are achieved.

Description

technical field

[0001] The invention relates to the technical field of sensors, in particular to signal conversion technology of magnetostrictive torsional waves, which converts mechanical torsional waves into electrical signals, and is suitable for detection instruments of position signals and liquid level signals. Background technique

[0002] With the continuous development of science and technology, the technical requirements for liquid level measurement and position measurement are gradually increasing. The widely used magnetostrictive sensor generally generates torsional waves through the magnetostrictive effect, and converts the mechanical signal of the torsional wave into an electrical signal through a transducer based on the inverse magnetostrictive effect method, and obtains the following by calculating the time difference The position of the magnet (float) where the measured medium moves, used for automatic control of the process.

[0003] At present, a magnetost...

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