High-sensitivity piezoelectric ceramic vibration sensing device and application thereof

Abstract

The high-sensitivity piezoelectric ceramic vibration sensing device comprises a shell, a piezoelectric ceramic piece is arranged in the shell, the piezoelectric ceramic piece is horizontally installed in the shell, the edge of the piezoelectric ceramic piece is fixed to the inner wall of the shell, and the upper portion and the lower portion of a sensing area of the piezoelectric ceramic piece are vacant; the vibration sensing device further comprises a heavy hammer, and the heavy hammer is placed above the center of the piezoelectric ceramic piece. According to the technical scheme of the heavy hammer, the sound sensing sensitivity of the piezoelectric ceramic piece is greatly improved, so that long-distance accurate measurement of long-distance and low-energy sound is achieved, and precision of long-distance sound detection of pipe network water leakage, power grid electric leakage, noise pollution and the like is achieved.

Description

technical field [0001] The invention relates to a high-sensitivity piezoelectric ceramic vibration sensing device, which belongs to the technical field of electronic sensors. Background technique [0002] In the field of sound measurement and control, piezoelectric ceramic sheets are widely used. In conventional designs, the external sound is mostly transmitted to the piezoelectric ceramic sheets through the shell and air, so that the piezoelectric ceramic sheets are excited by the vibration and impact of sound waves. current signal. This type of design has low sensitivity, short sensing distance and poor accuracy, which greatly limits the application of piezoelectric ceramics in sound sensing. For example, the patent of "piezoelectric acoustic sensor" with patent number 200510089078.6, due to low sensing sensitivity and poor accuracy, can only detect the noise signal of the operating condition of the equipment with a short distance and loud sound. At present, the sound se...

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Problems solved by technology

This type of design has low sensitivity, short sensing distance, and poor accuracy, which greatly limits the application of piezoelectric ceramics in sound sensing.

For example, the patent No. 200510089078.6 of the "Piezoelectric Acoustic Sensor" can only detect the noise signal of the operating condition of the equipment with a short distance and a loud sound due to its low sensitivity and poor accuracy.

At present, the sound sensors used in leak detection of water supply pipe networks also mostly use piezoelectric ceramics. Due to the limitation of low sensing sensitivity, they can only detect leaks with relatively short distances and loud sounds. The technology cannot be widely used, which has become an insurmountable difficulty in the application of modern technologies such as the Internet of Things and big data.

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