WO2006034998A1 - Systeme de capteur de temperature - Google Patents

Systeme de capteur de temperature Download PDF

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Publication number
WO2006034998A1
WO2006034998A1 PCT/EP2005/054778 EP2005054778W WO2006034998A1 WO 2006034998 A1 WO2006034998 A1 WO 2006034998A1 EP 2005054778 W EP2005054778 W EP 2005054778W WO 2006034998 A1 WO2006034998 A1 WO 2006034998A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
sensor device
temperature sensor
energy storage
probe
Prior art date
Application number
PCT/EP2005/054778
Other languages
German (de)
English (en)
Inventor
Eric Klemp
Leonard Reindl
Wolfgang Schnell
Original Assignee
BSH Bosch und Siemens Hausgeräte GmbH
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 BSH Bosch und Siemens Hausgeräte GmbH filed Critical BSH Bosch und Siemens Hausgeräte GmbH
Publication of WO2006034998A1 publication Critical patent/WO2006034998A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/32—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using change of resonant frequency of a crystal
    • 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
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
    • 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
    • G01K1/02—Means for indicating or recording specially adapted for thermometers
    • G01K1/026—Means for indicating or recording specially adapted for thermometers arrangements for monitoring a plurality of temperatures, e.g. by multiplexing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K2207/00—Application of thermometers in household appliances
    • G01K2207/02—Application of thermometers in household appliances for measuring food temperature
    • G01K2207/06—Application of thermometers in household appliances for measuring food temperature for preparation purposes

Definitions

  • the invention relates to a temperature sensor device according to the preamble of claim 1 and of a cooking appliance according to the preamble of claim 10.
  • a temperature sensor device with a Temperatur ⁇ probe for introduction into a food is known.
  • the temperature probe is provided for measuring an internal temperature of the food and for this purpose comprises a skewer-shaped extension and an energy storage unit designed as an electromagnetic resonant circuit for temporarily storing a vibrational energy in the temperature probe.
  • An integrated in the energy storage unit quartz crystal has a temperature-dependent natural frequency. Therefore, a natural frequency of the energy storage unit is temperature-dependent.
  • An excitation of the energy storage unit is made by an inductive coupling from the outside.
  • the invention is in particular the object of providing a Temperatursensorvorrich ⁇ device with a generic temperature probe that allows a safe determination of a core temperature of a food.
  • the invention is based on a temperature sensor device with a temperature probe for introduction into a food to be cooked, which is provided for wireless measurement of an internal temperature of the food and which comprises an energy storage unit.
  • the energy storage unit is provided for storing a vibrational energy in at least two temperature-dependent frequencies.
  • a temperature information contained in a first frequency can be completed, and a core temperature of a food can be reliably determined.
  • the second frequency can contribute through redundancy to the reduction of a measurement error, or it can be obtained by comparing the frequencies information about a spatial course of an internal temperature of a food, for example about a temperature gradient.
  • a device shall be considered “provided for storing vibration energy” if a decay time associated with an attenuation constant of the device is longer than at least one period of the oscillatory energy storing oscillations is.
  • An insight into a spatial progression of the internal temperature can be obtained with the aid of the temperature probe if the temperature-dependent frequencies are each assigned to a region of the temperature probe. If internal temperatures in two disjoint regions of the food or the temperature probe can be determined with the aid of the temperature probe, it is advantageously possible to obtain information about a temperature gradient. If the internal temperatures can be determined in at least three ranges, an extreme of the internal temperature profile can be determined extrapolatively. However, embodiments of the invention are also conceivable in which the detection of the internal temperature in various areas merely serves to spatially average the detected temperature.
  • At least one frequency depends substantially linearly on the temperature.
  • the temperature sensor device can be advantageously extrapolated by knowing the frequency at only two reference temperatures.
  • substantially linear a dependency is to be designated here which corresponds to a linear dependence at least within a measurement tolerance.
  • the energy storage unit comprises at least one quartz oscillator
  • a particularly low-loss, cost-effective and robust energy storage unit with high quality can be achieved, which permits an exact frequency determination.
  • a cutting angle relative to the crystal planes of the quartz it is possible to achieve a substantially linear temperature dependence of the frequency of the quartz in the relevant temperature range between 100 ° C. and 300 ° C.
  • a complete abandonment of electronic components in the energy storage unit can be achieved if the energy storage unit comprises at least one mechanically oscillatable system.
  • the oscillatory system can be given, for example, by a vibrating string, a torsion pendulum, a vibrating diaphragm, a vibrating blade clamped in on one side or by another oscillatable unit which appears meaningful to a person skilled in the art.
  • Embodiments of the invention are also conceivable in which a temperature-dependent damping behavior of the mechanically or electromechanically oscillatable system can be detected and used for temperature determination.
  • the temperature probe comprises a communication unit for communicating a signal modulated with at least one temperature-dependent frequency
  • a transmission of the internal temperature detected by the temperature probe can be achieved particularly reliably.
  • Expansive antennas can advantageously be dispensed with if the communication unit is provided for communicating a microwave signal.
  • the communication unit can communicate particularly advantageously by means of a microwave generator of a cooking appliance comprising the temperature sensor device, which can also advantageously be used for heating purposes.
  • thermo probe comprises a grip element which is provided for receiving the communication unit.
  • a falsification of a temperature measurement result due to contamination and / or damage to the energy storage unit can advantageously be avoided if the temperature probe has a sealed interior for receiving the energy storage unit.
  • FIG. 1 shows a cooking appliance with a temperature sensor device which comprises a temperature probe
  • Fig. 3 shows an alternative temperature probe with a mechanically oscillatable Sys ⁇ system.
  • FIG. 1 shows a cooking appliance 26a with a temperature sensor device for detecting an internal temperature of a food to be cooked 14a.
  • the temperature sensor device has an evaluation unit 28a, which detects temperature information from a temperature probe 10a, with which the evaluation unit 28a wirelessly communicates.
  • the evaluation unit 28a ver ⁇ operates the temperature information and uses them to regulate a cooking process of the food 14a.
  • the temperature information is utilized in different ways.
  • the evaluation unit 28a completes the cooking process when the internal temperature of the food item 14a reaches a predetermined minimum value.
  • the evaluation unit 28a changes a predetermined program duration of a cooking program as a function of a spatial and a temporal gradient of the internal temperature.
  • the evaluation unit displays the internal temperature on a display unit of the cooking appliance 26a.
  • the temperature probe 10a contains three energy storage units 12a-12a "which are designed as electromagnetic resonant circuits with quartz crystals 16a-16a” and each have an inductance and a capacitance connected in parallel with the quartz oscillator 16a-16a " 16a - 16a "is a few hundred.
  • the inductances and the capacities of the energy storage units 12a-12a are arranged in a gripping element 22a of the temperature probe 10a, while the oscillating crystals 16a-16a” are glued on a circuit carrier 30a on which printed conductors are printed.
  • a conductive, temperature-insensitive adhesive is used for bonding the oscillating crystals 16a-16a "on the circuit carrier 30a.
  • the circuit carrier 30a is arranged in a stainless steel tube sealed with inert gas under vacuum, sealed interior 24a, which forms a spike-shaped extension 36a of the temperature probe 10a, which is inserted during use into an interior of the item to be cooked 14a.
  • an antenna 32a is additionally arranged which receives a microwave signal which is generated by the evaluation unit 28a with the aid of a microwave generator 34a of the cooking appliance 26a.
  • the microwave signal comprises a broad spectrum of frequencies and is coupled via diodes into the energy storage units 12a-12a ", which are thereby excited to vibrate in their respective natural frequency.
  • the antenna 32a together with the diodes forms a communication unit 20a of the temperature
  • the oscillations of the energy storage units 12a-12a modulate a signal generated by the antenna 32a with the respective natural frequency.
  • the modulated signal represents an echo of the microwave signal generated by the evaluation unit 28a, is detected by the evaluation unit 28a and divided into its frequency spectrum by a programmable arithmetic unit integrated in the evaluation unit 28a by means of a fast Fourier transform algorithm.
  • the evaluation unit 28a determines the natural frequencies of the energy storage units 12a-12a "from the spectrum and the temperatures of the oscillating crystals 16a-16a" from these with the aid of assignment tables stored in a memory unit of the evaluation unit 28a.
  • the frequencies of the oscillating crystals 16a-16a "or of the energy storage units 12a-12a" are substantially dependent, i. H. except for deviations within a measuring accuracy of the temperature sensor device, linearly from the internal temperature of the cooking product 14a in the region of the respective quartz crystal 16a-16a ".
  • the evaluation unit 28a computationally by the three detected internal temperatures, a parabola, which describes a temperature profile in the interior of the food 14a along the extension 36a approximately. Subsequently, the evaluation unit 28a determines the temperature in a vertex of the parabola, which can be used as the core temperature of the item to be cooked 14a for controlling a cooking process.
  • FIG. 3 shows an alternative temperature probe 10b.
  • the description is intended to be essentially confined to differences from the temperature probe 10b shown in FIGS. 1 and 2, the description being given with regard to characteristics which remain the same Reference can be made to Figures 1 and 2. Analogous features are provided with the same reference numerals, the letters "a” and "b” being added to distinguish them.
  • FIG. 3 shows a temperature probe 10b with four mechanical energy storage units 12b-12b "which comprise oscillating wires 38b-38b", which form a mechanically oscillatable system.
  • the oscillating wires 38b-38b “are suspended in various regions along a spike-shaped extension 36b of the temperature probe 10b and extend into a gripping element 22b of the temperature probe 10b, wherein a web 40b is provided at the transition between the extension 36b and the gripping element 22b is arranged, on which the oscillating wires 38b - 38b '"rest.
  • the oscillating wires 38b-38b “have a 6.2 cm long, freely oscillating, antenna-like section, into which a microwave signal of an evaluation unit 28b of a cooking device 26b enclosing the temperature probe 10b is inserted
  • the upper sections of the oscillating wires 38b-38b "each oscillate in their natural frequency, which depends on a voltage of the respective vibrating wire 38b-38b" 38b - 38b '"in particular from a temperature in the region of the suspension of the vibrating wire 38b - 38b'" in the extension 36b from.
  • a portion of the microwave signal generated by the evaluation unit 28b is absorbed and / or emitted by the antenna-like sections of the oscillating wires 38b-38b '
  • the absorption rate depends on a vibration speed of the oscillating wire due to a Doppler shift caused by the oscillation of the respective section. such that a signal received by the evaluation unit 28b is modulated with the oscillation frequencies of the upper sections of the oscillating wires 38b-38b '".
  • the evaluation unit 28b analyzes the signal and calculates from the three detected, temperature-dependent frequencies a temperature profile in the interior of a food item 14b into which the extension 36b of the temperature probe 10b is inserted. reference numeral

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)

Abstract

L'invention concerne un système de capteur de température comportant une sonde de température (10) destinée à être introduite dans un produit de cuisson (14), conçue pour la mesure sans fil d'une température intérieure du produit de cuisson (14) et présentant une unité d'accumulation d'énergie (12). L'invention vise à mettre en oeuvre un tel système de capteur de température comportant une sonde de température (10), garantissant une détermination sure de la température intérieure du produit de cuisson (14). A cet effet, l'unité d'accumulation d'énergie (12) est conçue pour stocker une énergie d'oscillation à au moins deux fréquences dépendantes de la température.
PCT/EP2005/054778 2004-09-30 2005-09-23 Systeme de capteur de temperature WO2006034998A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004047758.2 2004-09-30
DE102004047758A DE102004047758B4 (de) 2004-09-30 2004-09-30 Temperatursensorvorrichtung

Publications (1)

Publication Number Publication Date
WO2006034998A1 true WO2006034998A1 (fr) 2006-04-06

Family

ID=35539159

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/054778 WO2006034998A1 (fr) 2004-09-30 2005-09-23 Systeme de capteur de temperature

Country Status (2)

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DE (1) DE102004047758B4 (fr)
WO (1) WO2006034998A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009056060B4 (de) 2009-08-19 2011-09-22 Vectron International Gmbh & Co.Kg Messsystem zur drahtlosen positionsunabhängigen Messung der Temperatur
DE102015109043A1 (de) * 2015-06-09 2016-12-15 Rational Aktiengesellschaft Kerntemperaturfühler für ein Gargerät
IT201900008436A1 (it) * 2019-06-10 2020-12-10 Sacet S R L Sonda, sistema, metodo di misurazione di temperatura per alimenti e sistema di trattamento per alimenti
US11579019B2 (en) * 2019-08-15 2023-02-14 Te Connectivity Solutions Gmbh Wireless energy-harvesting sensor probe
DE102022204282A1 (de) 2022-05-02 2023-11-02 BSH Hausgeräte GmbH Messspieß für Temperaturen von Lebensmitteln

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582921A (en) * 1968-08-06 1971-06-01 Charles R Krieger Temperature transducer and telemetry system
DE2935271A1 (de) * 1978-08-31 1980-04-24 Sharp Kk Temperaturfuehler
DE3119496A1 (de) * 1981-05-15 1982-12-23 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Speisenthermometer, insbesondere fuer mikrowellenherde
US6363330B1 (en) * 1998-04-10 2002-03-26 Satnam Singh Sampuran Alag Thermocouple failure detection in power generation turbines
US6431750B1 (en) * 1999-12-14 2002-08-13 Sierra Lobo, Inc. Flexible temperature sensing probe
DE10306940A1 (de) * 2003-02-18 2004-09-09 Rational Ag Verfahren zum Steuern eines Backprozesses

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5688294A (en) * 1979-12-21 1981-07-17 Tokyo Shibaura Electric Co Electronic range
DE4421373A1 (de) * 1994-06-18 1995-12-21 Wiesheu Wiwa Gmbh Ofen zur Wärmebehandlung von stückförmigen Lebensmitteln
DE19945021C2 (de) * 1999-09-20 2003-10-23 Rational Ag Verfahren zum Steuern eines Garprozesses und hierzu verwendbare Garprozeßfühlereinrichtung

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3582921A (en) * 1968-08-06 1971-06-01 Charles R Krieger Temperature transducer and telemetry system
DE2935271A1 (de) * 1978-08-31 1980-04-24 Sharp Kk Temperaturfuehler
DE3119496A1 (de) * 1981-05-15 1982-12-23 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Speisenthermometer, insbesondere fuer mikrowellenherde
US6363330B1 (en) * 1998-04-10 2002-03-26 Satnam Singh Sampuran Alag Thermocouple failure detection in power generation turbines
US6431750B1 (en) * 1999-12-14 2002-08-13 Sierra Lobo, Inc. Flexible temperature sensing probe
DE10306940A1 (de) * 2003-02-18 2004-09-09 Rational Ag Verfahren zum Steuern eines Backprozesses

Also Published As

Publication number Publication date
DE102004047758B4 (de) 2011-09-15
DE102004047758A1 (de) 2006-04-06

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