摘要:
It is disclosed a composite yarn structure (10) comprising: - a first element (15) comprising a coaxial flexible bi-component monofilament including a conductive component (20) and a thermoplastic component (30) exhibiting piezoelectric properties, - at least a second element (40) twisted around the first element (15), wherein the second element (40) has a lower elasticity with respect to the elasticity of the first element (15) such that, upon elongation of the yarn structure (10) in a first direction, the yarn structure (10) expands in a second direction, whereby the dimensions of the yarn are increased both in first and second directions to generate an additional force on said piezoelectric component of the first element.
摘要:
A challenge to be met by the present invention is to provide a vibration detection sensor which can be applied to various instruments or fields requiring accurate detection and measurement of vibration. A vibration detection sensor (100) has a substrate (2), and a cable-shaped pi ezoelectric element (1) connected directly to at least one end of the substrate. The cable-shaped piezoelectric element (1) has along a radial direction thereof a core electrode (3), a piezoelectric member (5) disposed around the core electrode, an outer electrode (7) disposed around the piezoelectric member, and a sheathing layer (9) disposed around the outer electrode.
摘要:
The invention provides a defect inspecting apparatus and a defect detecting method for specifying a position of a defect before polarization when the defect is included in a coaxial flexible piezoelectric member. Further, when a piezoelectric tube is moved in polarization, a friction force is produced between the coaxial flexible piezoelectric member and a block-like conductor and therefore, a large force is needed in moving the piezoelectric tube. The invention provides a polarizing apparatus and a polarizing method capable of moving the piezoelectric tube even by a small force. There are provided a defect detecting apparatus of a coaxial flexible piezoelectric member having a constitution of applying a direct current to a coaxial flexible piezoelectric member while moving a piezoelectric tube arranged at a hole of inspecting electrode means and a marking apparatus for marking a defect portion. Thereby, when a defect is present at a portion thereof arranged at the hole of the inspecting electrode means, electricity is discharged at the defect portion and therefore, the defect portion can be specified and the mark can be attached to the defect portion. Further, a conductive block provided with a path portion of the piezoelectric tube is divided. By dividing the block-like conductor by a plural number, a friction force between the block-like conductor per divided one and the piezoelectric tube is reduced. Further, the piezoelectric tube can be moved by a small force by a pulley arranged at a fold back portion of the piezoelectric tube.
摘要:
Structure permettant d'obtenir une réponse piézo-électrique maximum dans un câble coaxial piézo-électrique. Un câble coaxial piézo-électrique comporte un noyau polymère conducteur (2) formé d'un matériau polymère de poids moléculaire élevé dans lequel sont dispersées des particules conductrices, une couche polymère piézo-électrique (3) entourant le noyau polymère conducteur et un conducteur extérieur (4) entourant la couche polymère piézo-électrique, ainsi qu'une enveloppe protectrice (5) recouvrant le conducteur extérieur. Le matériau polymère de poids moléculaire élevé du noyau polymère conducteur comporte un polymère pouvant être lié étroitement au polymère piézo-électrique.
摘要:
L'invention se rapporte au domaine des capteurs linéaires de pression et en particulier à ceux utilisant les propriétés piézoélectriques d'un matériau électrique. L'invention a pour objet un procédé de fabrication d'un tel capteur formé d'un ou de plusieurs éléments transducteurs (1, 2) constitués de plusieurs tronçons associés de façon à pouvoir localiser au moyen d'un circuit de traitement (3, 4, 5, 6) délivrant des signaux codés, la partie du capteur qui a été sollicitée. Le procédé de l'invention prévoit des étapes de polarisation à température ambiante de certains tronçons suivies d'étapes de maintien à basse température (-100'C par exemple) de la polarisation, ainsi que d'étapes de dépolarisation par un champ alternatif décroissant à température ambiante. Application au contrôle du trafic routier, à la localisation de défaults dans la surveillance des ouvrages d'art par émission acoustique, etc ...
摘要:
A polarization apparatus is provided wherein a piezoelectric body tube 3 is wound around a first rotation drum 5 and a second rotation drum 6 and a coaxial flexible piezoelectric body 2 is polarized while the piezoelectric body tube 3 is wound. According to the polarization apparatus, polarization can be conducted except for the coaxial flexible piezoelectric body 2 of the portion containing a defect and a defect existing in the piezoelectric body tube 3 of a given length can also be detected be fore an outer electrode 4 is formed.
摘要:
A piezoelectric transducer includes an elongated, spiral or meandering piezoelectric element (2) in the form of a coaxial cable, and an electrically insulating layer (6) surrounding the piezoelectric element (2). The element (2) has a core electrode (3), a piezoelectric layer (4) surrounding the core electrode (3), and an outer electrode layer (5) surrounding the piezoelectric layer (4).
摘要:
A piezoelectric coaxial cable comprising a metallic helically wound inner conductor, the volume within the helix being filled with a solid material; a continuous piezoelectric polymer layer circumferentially surrounding the inner conductor; and an outer conductor in contact with the piezoelectric polymer layer but separated from the inner conductor.