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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

Active Publication Date: 2016-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

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 sensitivity of PZT piezoelectric ceramics is very high, greater than 200pC / N, but it is a hard and brittle ceramic material, when the impact force is large, it will cause structural damage to piezoelectric ceramics

Method used

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

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Embodiment Construction

[0023] The present invention will be further elaborated below through specific embodiments in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, the passive high-sensitivity impact sensor based on piezoelectric electret in this embodiment includes: shrapnel electrode 1, insulating gasket 2, back electrode 3, shrapnel electrode electret layer 4, back electrode electret layer 5. Cavity 6, wires and test circuit; wherein, the back electrode 3 is flat and adopts a conductive metal material; on the upper surface of the back electrode 3 and around the electret, an insulating gasket 2 is provided; the shrapnel electrode 1 The insulating gasket 2 is arranged on the back electrode 3, and the insulating gasket 2 electrically insulates between the shrapnel electrode 1 and the back electrode 3; the back electrode electret layer 5 is closely attached to the upper surface of the back electrode 3, and the shrapnel electrode The electret layer 4 is closely attach...

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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.

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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Application Information

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IPC IPC(8): G01L5/00G01L25/00
CPCG01L5/0052G01L25/00
Inventor 冯跃韩炎晖娄文忠
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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