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Piezoelectric pressure sensor

A pressure sensor, piezoelectric technology, applied in the direction of fluid pressure measurement using piezoelectric devices, fluid pressure measurement through electromagnetic components, and measurement of the property and force of piezoelectric devices. Fragmentation and other issues

Inactive Publication Date: 2004-04-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Metal thin films such as gold, palladium, and platinum have been baked or evaporated on piezoelectric ceramics to be used as conductors, but due to the brittle nature of piezoelectric ceramics, it cannot be applied to an arcuate surface.

Method used

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Examples

Experimental program
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Embodiment Construction

[0046] figure 1 For the best structure of the piezoelectric cable of the present invention, it includes: an inner conductor (1) made of a single-strand metal wire or a small multi-strand cascaded steel wire; Electrical composite layer (2), the composite layer (2) contains amorphous chlorinated polyethylene (a-CPE), crystalline chlorinated polyethylene (c-CPE) and piezoelectric ceramic powder; The outer conductor (3) formed by the metal film (31) on (32), the metal film (31) is in contact with the piezoelectric composite layer (2) but not in contact with the inner conductor (1); A protective sheath (4) made of insulating elastic material wrapped around the outer conductor (3).

[0047] The piezoelectric cable of the present invention is produced according to the following process procedures. First, lead titanate-lead zirconate (PbTiO 3 -PbZrO 3 ) powder is evenly attached to the CPE substrate, and then the rolled composite plate containing ceramic powder is cut into small p...

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PUM

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Abstract

Two kinds of pressure sensors using a piezoelectric composite comprising amorphous chlorinated polyethylene, crystalline chlorinated polyethylene and piezoelectric ceramic powder are disclosed. The first is a piezoelectric cable comprising an inner conductor of a metal helix, the volume within the metal helix is filled with fine insulating polymer fibers, a piezoelectric composite layer circumferentially surrounding the inner conductor, and an outer conductor of a metal film attached on a polymer membrane. The metal film is in contact with said composite layer but separated from the inner conductor and a protective jacket. The second type of pressure sensor is a planar sensor comprising a piezoelectric composite in a planar form sandwiched with conductors of two metal films attached on two polymer membranes, each metal film is in contact with the composite but separated from each other.

Description

technical field [0001] The present invention relates to pressure sensors using piezoelectric composite materials and discloses two types of pressure sensors. Background technique [0002] Since piezoelectric pressure sensors have many uses, such as hydrophones, stress sensors, vibration sensors, etc., many of the sensors described in this invention relate to piezoelectric materials, structures and other aspects. [0003] For example, US Patents 4,278,000, 4,568,851 and 4,849,946 disclose piezoelectric cables. Among them, the published typical internal conductors include single-strand metal wires, small multi-strand cascaded steel wires with a diameter of 0.3 mm, and conductive polymer layers. Since flexibility is the most important property of piezoelectric cables, piezoelectric polymers and piezoelectric composites are currently used as piezoelectric materials. Typical published piezoelectric polymers are polyvinylidene fluoride (PVDF), copolymers of polyvinylidene fluori...

Claims

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Application Information

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IPC IPC(8): G01L1/18G01L1/16G01L9/00H01L41/087
CPCH01L41/087Y10S310/80G01L1/16G01L9/008H10N30/60G01L1/18
Inventor 伊藤雅彦长井彪藤井优子荻野弘之
Owner PANASONIC CORP
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