Passive highly-sensitive impact sensor based on piezoelectrets and testing method thereof

An impact force sensor, piezoelectric electret technology, applied in the direction of force/torque/work measurement instrument calibration/test, force/torque/work measurement instrument, instrument, etc., can solve the structural damage of piezoelectric ceramics, difficult to accurately Measure weak impact force, low piezoelectric sensitivity, etc., to achieve excellent mechanical properties, low consumption, high efficiency sensitivity, and ultra-high sensitivity
CN105547553AActive Publication Date: 2016-05-04BEIJING INSTITUTE OF TECHNOLOGYGY
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
BEIJING INSTITUTE OF TECHNOLOGYGY
Publication Date
2016-05-04

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Abstract

The present invention discloses a passive highly-sensitive impact sensor based on piezoelectrets and a testing method thereof. Electret layers are arranged on a back electrode and a spring electrode, a cavity is formed between a spring electrode electret layer and a back electrode electret layer, and a pair of piezoelectrets is formed. The surfaces of the piezoelectrets have opposite polarization charges, and a macroscopic dipole is between the spring electrode electret layer and the back electrode electret layer. Under an external force, a macroscopic dipole distance is changed, an impact type voltage spike signal is formed, and the external force is obtained through measuring voltage. According to the sensor and the method, a special impact force structure mode is used to provide impact voltage, the sensitivity can reach 80V / 1MPa, and the sensor has the characteristics of high impact, high load, high sensitivity and the like. An external power supply is not needed, the sensor is self-powered and without paranoid voltage, the passive operation is achieved, and the sensor has the characteristics of low consumption and high efficiency and ultra high sensitivity in the current impact sensor power generation technology.
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Description

technical field

[0001] The invention relates to a passive impact sensor, in particular to a piezoelectric electret-based passive high-sensitivity impact sensor and a testing method thereof. Background technique

[0002] Vibration shock is a phenomenon that exists widely in nature and engineering, especially with the advancement of aerospace vehicles and the development of the automobile industry, it is of great importance to use low-cost and high-efficiency shock sensors. In recent years, impact sensors are developing towards lower power consumption and higher sensitivity. At present, typical passive impact sensors mainly use polyvinylidene fluoride PVDF piezoelectric flexible materials and PZT piezoelectric ceramics as sensitive materials, which can realize self-powered dynamic sensitivity. However, the piezoelectric sensitivity of PVDF piezoelectric flexible materials is low, less than 30pC / N, and it is difficult to accurately measure weak impact forces; the piezoelectric...

Claims

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