WO1997022861A1 - Ensemble capteur de temperature - Google Patents

Ensemble capteur de temperature Download PDF

Info

Publication number
WO1997022861A1
WO1997022861A1 PCT/GB1996/003167 GB9603167W WO9722861A1 WO 1997022861 A1 WO1997022861 A1 WO 1997022861A1 GB 9603167 W GB9603167 W GB 9603167W WO 9722861 A1 WO9722861 A1 WO 9722861A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature sensing
sensing assembly
sensing device
ceramic
assembly
Prior art date
Application number
PCT/GB1996/003167
Other languages
English (en)
Inventor
Philip George Camp
Kathryn Jane Meacham
Original Assignee
Bowthorpe Components Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bowthorpe Components Limited filed Critical Bowthorpe Components Limited
Priority to AU11651/97A priority Critical patent/AU1165197A/en
Publication of WO1997022861A1 publication Critical patent/WO1997022861A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
    • G01K1/16—Special arrangements for conducting heat from the object to the sensitive element

Definitions

  • the present invention relates to a temperature sensing assembly.
  • a temperature sensing device it is often required to mount a temperature sensing device in close thermal contact with a substrate, the temperature of which is to be monitored, but electrically isolated from that substrate.
  • the substrate may comprise a metal wall of a pipe or other housing which is electrically earthed, whilst the temperature sensing device (e.g. a PTC or NTC thermistor or a combination of such thermistors) is included in a high voltage circuit.
  • various arrangements have been used, for example involving the use of an epoxy resin adhesive layer or polymer film between the temperature sensing device and the substrate, this coating or layer being sufficiently thin to provide adequate thermal contact between the two but thick enough to ensure effective electrical isolation.
  • a temperature sensing assembly which comprises a temperature sensing device mounted to an element or thick film of ceramic material which is mounted to, or arranged to be mounted to, a substrate the temperature of which is to be measured, the ceramic material having a high thermal conductivity (preferably greater than 20 watts per metre) and a low electrical conductivity.
  • Suitable materials for the ceramic element include substantially stoichiometric compounds of an element of Group IIIA of the Periodic Table of the Elements (such as aluminium) and an element of Group VA or VIA of the Periodic Table (such as oxygen or nitrogen) , examples of suitable compounds being aluminium oxide and aluminium nitride, of which aluminium nitride is preferred in view of the substantially greater thermal conductivity which can be achieved.
  • aluminium nitride which is substantially stoichiometric (by which we mean within the range of about 96 to 104% of the precise stoichiometric ratio) may have a thermal conductivity of about 170 watts per metre when used in the form of a thick film, whereas aluminium oxide may have a thermal conductivity, which, although adequate, is only about 24 watts per metre.
  • the thick film is typically sintered from particles of such materials.
  • the temperature sensing device may comprise a flat component (e.g. an NTC or PTC thermistor) mounted face-to-face on a flat ceramic thick film.
  • a flat temperature sensing device may be mounted edge-on to one face of a flat ceramic thick film, with conductive fillets connecting the opposite faces of the temperature sensing device to the flat face of the ceramic film, on either side of the temperature sensing device.
  • FIGURE 1 is a diagrammatic side view of one embodiment of temperature sensing assembly in accordance with the invention.
  • FIGURE 2 is a similar view of a second embodiment of temperature sensing assembly in accordance with the invention.
  • a temperature sensing assembly which comprises a thermistor device 10, typically in the form of a disc, mounted onto one face of a flat ceramic thick film 12.
  • the opposite faces of both the thermistor 10 and the ceramic film 12 are selectively coated with an electrically conductive metal, e.g. copper or silver.
  • the thermistor 10 is soldered to the ceramic film 12: one electrical lead 14 is soldered to the same face of the ceramic film 12 as the thermistor 10, and a second electrical lead 16 is soldered to the opposite face of the thermistor 10.
  • the ceramic film 12 is soldered in face-to-face contact with a metal substrate 18, e.g. the wall of a pipe, the temperature of which is to be monitored.
  • a thermistor 20 is disposed with its edge against one face of a flat ceramic thick film 22.
  • the opposite faces of both the thermistor 20 and ceramic film 22 are selectively coated with an electrically conductive metal, e.g. of copper or silver.
  • Films 24 e.g. of copper are soldered to the opposite faces of the thermistor 20 and to the adjacent face of the ceramic film 22 to either side of the thermistor 20.
  • Electrical leads 26 of low thermal conductivity are connected to the respective copper films 24.
  • the ceramic body 22 is in this case soldered to the end wall of a tubular housing 28 in which the assembly is disposed.
  • the ceramic film 12 or 22 is of a high thermal conductivity but high electrical resistivity material. Suitable materials include aluminium oxide and aluminium nitride.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermistors And Varistors (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

Ensemble capteur de température qui comporte un dispositif (10) de détection de température monté sur un élément ou film épais de matériau céramique (12), lui-même monté ou conçu pour être monté sur un substrat (18) dont la température est à mesurer. Le matériau céramique possède une forte conductivité thermique et une faible conductivité électrique.
PCT/GB1996/003167 1995-12-20 1996-12-19 Ensemble capteur de temperature WO1997022861A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11651/97A AU1165197A (en) 1995-12-20 1996-12-19 Temperature sensing assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9526278.8 1995-12-20
GB9526278A GB2308446A (en) 1995-12-20 1995-12-20 Temperature sensor having a ceramic substrate with low electrical conductivity

Publications (1)

Publication Number Publication Date
WO1997022861A1 true WO1997022861A1 (fr) 1997-06-26

Family

ID=10785892

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1996/003167 WO1997022861A1 (fr) 1995-12-20 1996-12-19 Ensemble capteur de temperature

Country Status (3)

Country Link
AU (1) AU1165197A (fr)
GB (1) GB2308446A (fr)
WO (1) WO1997022861A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20155239A1 (it) * 2015-11-04 2017-05-04 Magneti Marelli Spa Dispositivo elettronico con componente elettronico di potenza e rilevazione diretta della temperatura di tale componente?
US10852198B2 (en) * 2018-08-24 2020-12-01 Siemens Industry, Inc. Temperature sensor of thermal monitoring system for use in power distribution systems

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1320924A (en) * 1969-07-22 1973-06-20 Gen Electric Semiconductor device with thermally conductive dielectric barrier
US4242659A (en) * 1979-10-15 1980-12-30 Leeds & Northrup Company Thin film resistance thermometer detector probe assembly
EP0082768A2 (fr) * 1981-12-23 1983-06-29 L.C.C.-C.I.C.E. - Compagnie Europeenne De Composants Electroniques Capteur de température et dispositif l'incorporant
DE3838121A1 (de) * 1988-11-10 1990-05-17 Vdo Schindling Temperaturgeber

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5041809A (en) * 1990-01-08 1991-08-20 General Electric Company Glass-ceramic temperature sensor for heating ovens
US5053740A (en) * 1990-01-11 1991-10-01 General Electric Company Porcelain enamel temperature sensor for heating ovens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1320924A (en) * 1969-07-22 1973-06-20 Gen Electric Semiconductor device with thermally conductive dielectric barrier
US4242659A (en) * 1979-10-15 1980-12-30 Leeds & Northrup Company Thin film resistance thermometer detector probe assembly
EP0082768A2 (fr) * 1981-12-23 1983-06-29 L.C.C.-C.I.C.E. - Compagnie Europeenne De Composants Electroniques Capteur de température et dispositif l'incorporant
DE3838121A1 (de) * 1988-11-10 1990-05-17 Vdo Schindling Temperaturgeber

Also Published As

Publication number Publication date
GB9526278D0 (en) 1996-02-21
AU1165197A (en) 1997-07-14
GB2308446A (en) 1997-06-25

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