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Electret piezoelectric cable and applications thereof

A technology of piezoelectric cables and electrets, which is applied to piezoelectric/electrostrictive/magnetostrictive devices, parts and circuits of piezoelectric devices or electrostrictive devices, and can solve problems such as weak signal strength

Inactive Publication Date: 2014-05-14
NEWNAGY TANGSHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, piezoelectric cables have technical problems such as weak signal strength, so it is urgent to develop a piezoelectric cable with high piezoelectric signal strength and good sensitivity

Method used

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  • Electret piezoelectric cable and applications thereof
  • Electret piezoelectric cable and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Embodiment 1 is used as the preparation of the cable of traffic axis sensor

[0055] a. Preparation of thin film for piezoelectric electret layer:

[0056] Put 10g of PVDF into a 1000mL beaker, use a 100mL graduated cylinder to measure 80ml of dimethylformamide (DMF) into the beaker to dissolve PVDF (11.7wt%), then seal the beaker with plastic wrap and ultrasonically treat it for 30min. The PVDF is completely dissolved and ready for later use.

[0057] The above prepared PVDF solution is evenly and directly coated on the prepared PDMS soft template with cuboid protrusions by spin coating (the height of the raised cuboid of the template is 9 microns, and the bottom surface is a square with a side length of 9 microns, The interval between the protrusions is 0.5 μm), and the coating is controlled so that the thickness of the PVDF film after drying is 100 μm. After coating, it is placed in a vacuum dryer at 80° C. for 1 hour. After drying, the PDMS soft template was remov...

Embodiment 2

[0066] Embodiment 2 is used as the preparation of the cable of traffic axis sensor

[0067] a. Preparation of thin film for piezoelectric electret layer:

[0068] Put 10g of PVDF into a 1000mL beaker, use a 100mL graduated cylinder to measure 80ml of dimethylformamide (DMF) and add it to the beaker to dissolve PVDF (11.7wt%), then seal the beaker with plastic wrap and ultrasonically treat it for 30min. The PVDF is completely dissolved and ready for later use.

[0069] The above prepared PVDF solution is evenly and directly coated on the prepared PDMS soft template with cuboid protrusions by spin coating (the height of the raised cuboid of the template is 0.5 micron, and the bottom surface is a square with a side length of 1 micron, The interval between the protrusions is 15 microns), and the coating is controlled so that the thickness of the PVDF film after drying is 100 microns. After coating, it is placed in a vacuum dryer at 80° C. for 1 hour. After drying, the PDMS soft ...

Embodiment 3

[0078] Embodiment 3 is used as the preparation of the cable of traffic axis sensor

[0079] a. Preparation of thin film for piezoelectric electret layer:

[0080] Put 10g of PVDF into a 1000mL beaker, use a 100mL graduated cylinder to measure 80ml of dimethylformamide (DMF) into the beaker to dissolve PVDF (11.7wt%), then seal the beaker with plastic wrap and ultrasonically treat it for 30min. The PVDF is completely dissolved and ready for later use.

[0081] The above prepared PVDF solution is evenly and directly coated on the prepared PDMS soft template with cuboid protrusions by spin coating (the height of the raised cuboid of the template is 5 microns, and the bottom surface is a square with a side length of 5 microns, The interval between the protrusions is 50 microns), and the coating is controlled so that the thickness of the PVDF film after drying is 100 microns. After coating, it is placed in a vacuum dryer at 80° C. for 1 hour. After drying, the PDMS soft template wa...

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Abstract

The invention provides an electret piezoelectric cable and applications thereof. The electret piezoelectric cable comprises a first electrode core, a piezoelectric electret layer, a polymer insulation layer, a second layer electrode layer and a shielding layer which are successively coaxially arranged. The invention also provides the applications of the piezoelectric cable in a traffic shaft sensor, a piezoelectric cable switch and a contact microphone. The electret piezoelectric cable has the advantages of high piezoelectric signals, higher voltage response sensitivity, high mechanical strength, and good linearity output.

Description

technical field [0001] The invention relates to a piezoelectric cable containing a piezoelectric electret film, in particular to an electret piezoelectric cable adopting a self-shielding coaxial structure. Background technique [0002] Piezoelectric sensors are sensors made of the piezoelectric effect produced by piezoelectric materials. They have been widely used in many fields such as acoustics, medical treatment, industry, transportation, security and so on. development trend. When a piezoelectric material is deformed (including bending and stretching deformation) by an external force in a certain direction, charges will be generated on its surface due to the polarization of internal charges. Piezoelectric materials can be divided into piezoelectric single crystal, piezoelectric polycrystalline and organic piezoelectric materials. Polarized polyvinylidene fluoride (PVDF), polyvinylidene fluoride and polytrifluoroethylene copolymers are usually used as piezoelectric mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/087H01L41/04H10N30/60H10N30/80
Inventor 刘军锋王卓J·亦岭森陈锋
Owner NEWNAGY TANGSHAN
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