EP1929261A1 - Capteur de temperature - Google Patents

Capteur de temperature

Info

Publication number
EP1929261A1
EP1929261A1 EP06762227A EP06762227A EP1929261A1 EP 1929261 A1 EP1929261 A1 EP 1929261A1 EP 06762227 A EP06762227 A EP 06762227A EP 06762227 A EP06762227 A EP 06762227A EP 1929261 A1 EP1929261 A1 EP 1929261A1
Authority
EP
European Patent Office
Prior art keywords
temperature sensor
material layer
electrodes
substrate
sensor according
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP06762227A
Other languages
German (de)
English (en)
Inventor
Udo Weimar
Nicolae Barsan
Michael Wandel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eberhard Karls Universitaet Tuebingen
Original Assignee
Eberhard Karls Universitaet Tuebingen
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 Eberhard Karls Universitaet Tuebingen filed Critical Eberhard Karls Universitaet Tuebingen
Publication of EP1929261A1 publication Critical patent/EP1929261A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • G01K3/02—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values
    • G01K3/04—Thermometers giving results other than momentary value of temperature giving means values; giving integrated values in respect of time
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/06—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using melting, freezing, or softening

Definitions

  • the invention relates to a temperature sensor which can be attached to any objects and over the permanently detectable whether heat has been supplied to an object beyond a certain level.
  • the object of the invention is to develop a temperature sensor which is simple to produce in large numbers, can be constructed inexpensively, is permanently functional, is easy to install on any objects, has a certain flexibility with respect to assembly and does not require its own energy source.
  • the object is achieved with a temperature sensor which has at least two spaced-apart electrodes and at least one material layer on a substrate, and wherein material from the material layer accumulates between the electrodes on the substrate as a function of the temperature acting on the material layer and / or changed.
  • the temperature sensor according to the invention has the significant advantage that it does not require any specific materials for the substrate or the necessary material layer. It is only important that one can perform a capacitance measurement and / or resistance measurement via the electrodes and that at a temperature change or certain amount of heat supply, which is not desired for the selected product, the material layer then undergoes a capacitive change and / or electrical resistance change measurably.
  • the change in capacitance and / or resistance is irreversible, so that it can be permanently proven whether the product provided with the temperature sensor according to the invention was exposed to an impermissible quantity of heat input.
  • the capacitance of the material layer between the electrodes or the electrical resistance also changes, if the Material layer is electrically conductive. If the change is linked to the temperature, its temperature value is to be detected, it can always be permanently demonstrated by means of a measurement whether the product was exposed to an unintended temperature by comparing the reference capacitance with the measured capacitance or by comparing measured electrical resistance values with one another.
  • the temperature sensor assembly does not require an energy source, temperature changes on a product provided with the temperature sensor can be permanently detected and the time limit of the measurement verification depends solely on the durability of the materials used to construct the temperature sensor.
  • the enrichment and / or the change in the material layer can be adjusted by exceeding the melting point of the material layer.
  • This has the advantage that material layers of which the melting point is known are applied to the substrate of the temperature sensor and, for example, an object exceeds a critical temperature and the melting point of the material layer likewise corresponds to this critical temperature, then the material layer becomes the aggregate state at this temperature and thus also their capacitive properties and their electrically conductive behavior. If this changed behavior or the changed properties is measured, then the degree of heat input into an article or its temperature load can be detected by performing a measurement on the temperature sensor according to the invention before a heat load and after a heat load.
  • the article provided with the temperature sensor according to the invention has not undergone any inadmissible supply of heat. Are those to be compared? The measurements are significantly different, it can be said with certainty that the tested item was exposed to an impermissible heat.
  • a wax from one of the following substances or from a combination of the following substances is used as the material layer.
  • These are substances whose melting point is between -33 ° and + 60 °.
  • Combinations of the substances specified here are also conceivable, so that melting points of substance combinations can be produced which lie between the values indicated.
  • the substances listed in the table below are only a selection and other substances can be selected which have, for example, by themselves a waxy behavior or which are additionally incorporated in base waxes or are.
  • Electrodes or electrode pairs are provided on the substrate. Different distances between the electrodes can be used to determine different heat quantity feeds.
  • At least one electrode has an extension of different length compared to the other electrodes formed on the substrate and / or if electrode pairs are arranged on the substrate in a series and / or parallel connection. This increases the possibilities of the measurements to be carried out. Valuations about the temperature load of an object can be given more differentiated.
  • the capacitive or electrically conductive behavior of the material layer used can also be changed.
  • the substrate of the temperature sensor according to the invention is preferably selected from glass or ceramic, if the temperature sensor according to the invention is to be used in an aggressive medium or in an aggressive atmosphere.
  • the substrate can also be a plastic carrier or a plastic film or other flexible materials can also be selected as carrier material for the material layer and the electrodes.
  • the temperature sensor according to the invention can also be mounted on curved surfaces in a simple manner. Thus, the temperature sensor can always be attached to an object where it is needed. Changes in the material layer in the temperature sensor according to the invention can be measured particularly easily if measuring surfaces for contacting a measuring and / or reading device are formed on the electrodes.
  • the material layer flows on the substrate in an aggregate state change of the material layer due to capillary forces in at least one formed on the substrate riser and at least one electrode is provided along both longitudinal and on both sides of the riser to the riser.
  • the temperature sensor is formed with riser tubes, into which a liquid material layer can flow, it is also possible to make a statement about the duration of the heat supply or the temperature radiation onto the temperature sensor. Namely, the riser pipes are made differently in cross-sectional diameter, the capillary forces acting in the riser tubes are different. In a narrow standpipe, liquid inflows or changes are stronger and faster to recognize than in risers with larger diameters.
  • the condition may occur that one or the other riser pipe is loaded with liquid and another riser tube still exhibits the original initial capacity behavior during a measurement ,
  • an electrically conductive metal powder and / or metallic particles can be mixed into the material layer, which are provided in the functional state of the temperature sensor locally without heat supply and limited to the surface on the substrate After the heat supply under the change of the state of aggregation of the material layer, the metal powder or the metallic particles with the liquid material layer are uniformly distributed between the electrodes.
  • the law of entropy is used, which remains minimally the same in a closed system but normally increases. This is especially the case with a temperature increase and with a heat supply.
  • the binding of the metallic particles or the electrically conductive particles by the liquefaction of the wax given by the particles are locally bound, so the particles distribute evenly between the electrodes and there may be a change in capacitance in the material layer or a modified electrical Conductive behavior of the material layer can be measured. If the product provided with the temperature sensor is cooled again, the electrically conductive particles are locally bound in the metal layer and fixed there. Due to the change of state or due to the local place changes of the particles, evidence can also be provided staggered in time whether a product was exposed to an inadmissible heat supply or to an impermissible temperature load.
  • the temperature sensor according to the invention can be permanently attached to a product which is to be temperature-monitored.
  • the electrically conductive particles are plastics, carbons or else the metallic metallic particles can be magnetized, then the
  • Particles in a predetermined distribution in the material layer of the temperature sensor then held over a magnetic strip if the temperature sensor should be exposed to an inadmissible temperature during storage or transport.
  • the temperature sensor according to the invention can be used in an RFID element and also integrated there. If the known technology of radio frequency identification is used, data can also be read from the temperature sensor without contact and without visual contact, and they can be stored accordingly.
  • the invention is achieved for producing a temperature sensor with subsequent production steps.
  • electrodes are applied to a substrate of glass, ceramic, plastic or plastic film. Subsequently, in a second step, the electrodes are embedded in a material layer of wax, consisting of the substances of Table 1 or of combinations of substances from Table 1, and then the material layer is cured in a production mold of the temperature sensor.
  • electrically conductive particles made of plastic, metal or carbon are introduced into the liquid or viscous wax layer in a third step, and also aligned locally. Subsequently, the material layer is cured. If such method steps are used, the temperature sensor according to the invention can be manufactured in a simple and cost-effective manner. If electrically conductive and magnetizable particles are used in the material layer, they can be aligned with an electromagnet.
  • the electrically conductive or magnetisable particles onto a material layer by means of an adhesive tape provided with metallic particles, by surface-depositing these particles stick to the tape.
  • the metal layer melts, the particles are transferred in the desired manner into the material layer. If the particles have been introduced into the liquid or viscous material layer, then this material layer is cured. The particles are then fixed locally in the material layer.
  • the temperature sensor according to the invention will be described in subsequent embodiments.
  • the illustrations shown in the figures are highly schematic and not to scale.
  • the temperature sensor according to the invention can be made very thin and also with respect to its total thickness very thin, by using components in film thickness for all process steps.
  • Fig. 1 is a plan view of a temperature sensor with a material layer having two electrodes on a substrate;
  • FIG. 2 shows a temperature sensor according to the invention in the ready state with a material layer in which electrically conductive particles are embedded;
  • FIG 3 shows a temperature sensor according to the invention in the activated state in which the material layer has liquefied.
  • FIG. 4 shows a further embodiment of a temperature sensor according to the invention with three electrodes
  • FIG. 5 shows a further embodiment of a temperature sensor according to the invention with riser tubes; and 6 shows the layer structure of a temperature sensor according to the invention.
  • the first electrode 14 has a first measuring surface 15. Spaced apart from the first electrode 14, a second electrode 16 is arranged on the substrate, on which a second measuring surface 17 is formed.
  • the first and second electrodes 14, 16 are embedded in a material layer 18.
  • the first and second measuring surfaces 15, 17 are freely accessible to a reading device on the temperature sensor 10, so that capacitive changes in the material layer or changes in the electrical resistance of the material layer 18 can be measured via the electrodes 14, 16.
  • the material layer 18 is selected at the temperature sensor 10 to be tuned to a critical temperature of an article to which the temperature sensor 10 is attached. If the critical temperature on the object is exceeded, the capacitive behavior or the electrical behavior of the material layer 18 changes permanently. Time offset can thus be measured via the electrodes 14, 16, the different capacitive behavior or a differential resistance. If reference output values and measured values are different, this is the proof that the product provided with the temperature sensor 10 was exposed to an inadmissible heat input or temperature radiation.
  • FIG. 2 shows a temperature sensor 20 with a substrate 22, on which a first electrode 24 with a first measuring surface 25 is arranged. Locally spaced a second electrode 26 is arranged with a second measuring surface 27 on the substrate 22.
  • the electrodes 24, 26 are embedded in a material layer and in the region of an electrode 26 metallic particles 29 are arranged.
  • the metallic particles 29 are fixed in a waxy material layer 28 because the material layer 28 is solid and cured in the state shown in FIG.
  • the response of the temperature sensor 20 may be adjusted over a distance 29 'by embedding the metallic particle concentration at different distances from the first electrode 24.
  • the metallic particles 29 can move in the liquid material layer 28, following the findings of entropy, and a distribution, as shown by way of example in FIG. 3, arises.
  • the state changes of the material layer 28 and the different distribution of the metallic particles 29 can be detected via the measuring surfaces 25, 27 via a change in resistance.
  • FIG. 4 shows a further embodiment of a temperature sensor 30 having a substrate 32 and a first electrode 34 with a first measuring surface 35, a second electrode 36 and a second measuring surface 37, as they are embedded in a material layer 38.
  • Metallic particles 39 are concentrated at the second electrode 36 in the hardened material layer 38 incorporated.
  • a third electrode 41 with a third measuring surface 42 is likewise embedded in the material layer 38. If electrically conductive state changes between the electrodes 36, 41 on the one hand and 36, 34 on the other hand are measured, the duration of a heat input into the temperature sensor 30 can also be detected via the temperature sensor 30.
  • Fig. 5 shows a further embodiment of an inventive
  • Temperature sensor 50 with a substrate 52, on which electrode pairs 54, 55, 56, 57 and electrode pairs 58, 59 are arranged. On the
  • Substrate 52 is formed a material layer 61, which in a Aggregate state change from the solid to the liquid form in risers 63, 65, 67 can flow.
  • a change in capacitance 69 can be used to ascertain whether a layer of material in liquefied form has flowed into the riser pipes 63, 65, 67 into the region of the electrode pairs and possibly has solidified there again.
  • FIG. 6 shows the production of a temperature sensor 70 according to the invention with a substrate 72, on which electrodes 74, 76 are embedded, which are embedded in a material layer 78.
  • Electrically conductive particles 79 made of metal, plastic or carbon are identified by the reference numeral 79. If the particles 79 are magnetizable, they can be aligned via magnets within the material layer 78 as long as the material layer 78 has not yet cured.
  • a film-like substrate 72 is placed on a Peltier element 81.
  • the electrodes 74, 76 are brought. If the material layer 78 is applied in liquid phase to the substrate and the electrodes 74, 76, then the particles 79 can be locally positioned on the substrate 72 via an electromagnet. After positioning, the material layer 78 is cured and the temperature sensor can be used as described according to the invention.
  • a temperature sensor 10 which is suitable for attachment to or on objects of all kinds, at least two spaced-apart electrodes 14, 16 and at least one material layer 18 are arranged on a substrate 12.
  • the material layer 18 is formed between the electrodes 14, 16, wherein the material layer 18 changes depending on the temperature acting on the material layer 18 or it accumulates in different Form between the electrodes 14, 16 at.
  • the temperature sensor 10 does not require an energy source and material changes of the material layer 18 can be measured via the electrodes 14, 16.

Landscapes

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

Abstract

L'invention concerne un capteur de température (10) conçu pour être fixé sur des objets de toute sorte. Ce capteur de température comprend au moins un substrat (12) sur lequel sont disposées au moins deux électrodes (14, 16) lesquelles sont espacées l'une de l'autre, ainsi qu'au moins une couche de matière (18) qui est configurée entre lesdites électrodes (14, 16). Cette couche de matière (18) se modifie sous l'effet de la température, ou s'enrichit sous une forme différente entre les électrodes (14, 16). Le capteur de température (10) selon l'invention ne requiert aucune source d'énergie, et les modifications affectant la matière de la couche de matière (18) peuvent être mesurées par l'intermédiaire des électrodes (14, 16).
EP06762227A 2005-09-01 2006-06-28 Capteur de temperature Withdrawn EP1929261A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200510041495 DE102005041495A1 (de) 2005-09-01 2005-09-01 Temperatursensor
PCT/EP2006/006230 WO2007025589A1 (fr) 2005-09-01 2006-06-28 Capteur de temperature

Publications (1)

Publication Number Publication Date
EP1929261A1 true EP1929261A1 (fr) 2008-06-11

Family

ID=37096320

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06762227A Withdrawn EP1929261A1 (fr) 2005-09-01 2006-06-28 Capteur de temperature

Country Status (3)

Country Link
EP (1) EP1929261A1 (fr)
DE (1) DE102005041495A1 (fr)
WO (1) WO2007025589A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT511076B1 (de) * 2011-06-10 2012-09-15 Univ Graz Tech Verfahren und vorrichtung zum erfassen der temperaturgeschichte eines verderblichen produktes
DE102013102622B4 (de) * 2013-03-14 2021-01-28 Schreiner Group Gmbh & Co. Kg Temperatursensor, Etikett und Verfahren
DE102013108557B3 (de) * 2013-08-08 2014-11-13 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Einrichtung zur irreversiblen Erfassung einer Überschreitung einer vorbestimmten Temperatur
AT516195B1 (de) * 2014-08-28 2017-10-15 Dieter Dr Süss Passiver drahtloser RFID Temperatur Indikator
DE102016005075A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005078A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005133A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren und Vorrichtung zur Temperaturüberwachung einer kryokonservierten biologischen Probe
DE102016005077A1 (de) * 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Probenbehälter für eine kryokonservierte biologische Probe, Verfahren zur Herstellung des Probenbehälters, Verfahren zur Temperaturüberwachung einer kryokonservierten Probe
DE102016005070A1 (de) 2016-04-27 2017-11-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung und Verfahren zur Temperaturüberwachung einer kryokonservierten biologischen Probe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10338076A1 (de) * 2003-08-19 2005-03-31 Siemens Ag Funkabfragbares Etikett, insbesondere zur Kontrolle einer durchgehenden Kühlkette beim Transport oder bei der Lagerung von gekühlten bzw. tiefgekühlten Lebensmitteln

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
FR2693268B1 (fr) 1992-07-02 1994-09-30 Microondes Syst Sa Procédé et dispositif de contrôle du chauffage par micro-ondes d'un produit à une température et pendant un temps déterminés, support de marquage et récipient pour produit destiné à un tel contrôle.
DE19622671A1 (de) * 1995-06-30 1997-01-02 Basf Magnetics Gmbh Temperatur-Indikator für gekühlte Produkte oder ähnliches
JP3368758B2 (ja) * 1996-07-16 2003-01-20 株式会社豊田中央研究所 熱履歴検出方法および熱履歴検出センサ
FI113895B (fi) * 2003-02-27 2004-06-30 Metso Corp Lämpötiladetektori/indikaattori

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10338076A1 (de) * 2003-08-19 2005-03-31 Siemens Ag Funkabfragbares Etikett, insbesondere zur Kontrolle einer durchgehenden Kühlkette beim Transport oder bei der Lagerung von gekühlten bzw. tiefgekühlten Lebensmitteln

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2007025589A1 *

Also Published As

Publication number Publication date
DE102005041495A1 (de) 2007-03-08
WO2007025589A1 (fr) 2007-03-08

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