Method for outputting measured exciting force signal of piezoelectric vibration sensor with high sensitivity

Abstract

The invention discloses a method for outputting a measured exciting force signal of a piezoelectric vibration sensor with high sensitivity, and aims to solve the problem that a conventional cantileverbeam type piezoelectric vibration sensor cannot accurately measure a vibration signal with higher frequency. The method is realized through the following technical scheme: the method comprises the following steps: enabling piezoelectric sensitive elements to be overlapped to form a piezoelectric cantilever beam serving as a sensitive element, and enabling the to-be-measured vibration of a mass block to act on the sensitive elements, wherein the formed piezoelectric cantilever beam is provided with a damping block which is fixed to the position close to the base. The cantilever beam piezoelectric body vibrates under the action of the mass block; when the vibration frequency is close to the first-order resonance frequency of the cantilever beam piezoelectric body, the condition that the amplitude near the first-order resonance frequency point is sharply increased under the damping effect of the damping block due to resonance is effectively restrained, the formed effect is that in the frequency band lower than the second-order resonance frequency, the amplitude of cantilever beam vibration and the amplitude of measured exciting force are in a corresponding linear relation, and the high-frequency upper limit with the frequency monitoring upper limit requirement reaching high sensitivity can be obtained.

Description

technical field [0001] The invention relates to a piezoelectric vibration sensor in the field of vibration monitoring, in particular to a cantilever beam type piezoelectric vibration sensor with high damping, high frequency upper limit and high sensitivity output. Background technique [0002] The cantilever beam piezoelectric vibration sensor plays an important role in some special application fields (such as the nuclear energy industry) due to its high sensitivity, good signal-to-noise ratio, and strong output signal. The sensing unit of this type of sensor is mainly a cantilever beam formed by two piezoelectric sheets fastened together. When excited by external vibrations, the cantilever beam bends, producing a high output signal due to the change in size. However, due to the low resonance frequency of the cantilever beam structure, the upper limit of the frequency that can be accurately measured is low. It is understood that the upper frequency limit of the cantilever ...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a cantilever beam type high-damping piezoelectric vibration sensor with high damping, high frequency upper limit, and high sensitivity output to meet the requirements of most vibration monitoring for the shortcomings of the existing technology. The problem that the cantilever beam piezoelectric vibration sensor cannot accurately measure higher frequency vibration signals

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