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1. WO1997028418 - CAPACITANCE TRANSDUCER APPARATUS AND CABLES

Publication Number WO/1997/028418
Publication Date 07.08.1997
International Application No. PCT/GB1997/000283
International Filing Date 31.01.1997
Chapter 2 Demand Filed 29.08.1997
IPC
G01B 7/14 2006.01
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
7Measuring arrangements characterised by the use of electric or magnetic means
14for measuring distance or clearance between spaced objects or spaced apertures
H01B 11/20 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
11Communication cables or conductors
18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
20Cables having a multiplicity of coaxial lines
CPC
G01B 7/14
GPHYSICS
01MEASURING; TESTING
BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
7Measuring arrangements characterised by the use of electric or magnetic means
14for measuring distance or clearance between spaced objects or spaced apertures
H01B 11/206
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
11Communication cables or conductors
18Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor
20Cables having a multiplicity of coaxial lines
206Tri-conductor coaxial cables
Applicants
  • BICC PUBLIC LIMITED COMPANY [GB]/[GB] (AllExceptUS)
  • FYLDE ELECTRONIC LABORATORIES LTD. [GB]/[GB] (AllExceptUS)
  • STRINGFELLOW, John, Francis [GB]/[GB] (UsOnly)
  • WAYMAN, Leslie [GB]/[GB] (UsOnly)
  • KNOX, Bryan [GB]/[GB] (UsOnly)
Inventors
  • STRINGFELLOW, John, Francis
  • WAYMAN, Leslie
  • KNOX, Bryan
Agents
  • DLUGOSZ, Anthony, Charles
Priority Data
9602134.002.02.1996GB
9603364.216.02.1996GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) CAPACITANCE TRANSDUCER APPARATUS AND CABLES
(FR) DISPOSITIF TRANSDUCTEUR DE CAPACITE ET CABLES
Abstract
(EN)
Capacitance transducer apparatus, for example for measuring blade tip clearance in a jet engine of gas turbine, comprises an oscillator (14) connected by a cable (6) to a capacitance means such as a probe (4). The cable is tri-axial comprising an inner conductor (22), an outer protective layer (24) and an intermediate layer (26) between the outer layer and inner conductor, the inner conductor, intermediate layer and outer layer all being electrical conductors. The intermediate layer (26) consists of a material that is different to that forming the outer layer and is of relatively high electrical conductivity. The resistance of the intermediate layer is preferably less than 1 Ohm metre-1, and especially les than 0.1 Ohm metre-1, which may be achieved by forming the intermediate layer from a nickel based material, and especially from pure nickel. The reduction in the intermediate layer resistance can lead to higher sensivity of the apparatus by enabling any guard driver amplifier (165) in the apparatus to drive the capacitance over the full length of the cable.
(FR)
Dispositif transducteur de capacité servant, par exemple, à mesurer la garde du bout des aubes d'un moteur à réaction ou d'une turbine à gaz et comprenant un oscillateur (14) relié par un câble (6) à un moyen de détection de capacité, tel qu'une sonde (4). Ce câble est tri-axial et comprend un conducteur intérieur (22), une couche extérieure de protection (24) et une couche intermédiaire (26) entre la couche extérieure et le conducteur intérieur, ce dernier, la couche intermédiaire et la couche extérieure étant tous des conducteurs électriques. La couche intermédiaire (26) est constituée par un matériau différent de celui qui constitue la couche extérieure et présente une conductivité électrique relativement élevée. La résistance de la couche intermédiaire est, de préférence, inférieure à 1 Ohm mètre-1 et, particulièrement, inférieure à 0,1 Ohm mètre-1, ce qui peut être réalisé en façonnant la couche intermédiaire à partir d'un matériau à base de nickel et, particulièrement, du nickel pur. La diminution de la résistance de la couche intermédiaire peut rendre le dispositif plus sensible en permettant à tout amplificateur de circuit de commande protecteur (165) du dispositif de transmettre la capacité sur la longueur totale du câble.
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