EP2467688A1 - Système de mesure permettant la mesure d une température sans fil et indépendamment de la position - Google Patents

Système de mesure permettant la mesure d une température sans fil et indépendamment de la position

Info

Publication number
EP2467688A1
EP2467688A1 EP10752743A EP10752743A EP2467688A1 EP 2467688 A1 EP2467688 A1 EP 2467688A1 EP 10752743 A EP10752743 A EP 10752743A EP 10752743 A EP10752743 A EP 10752743A EP 2467688 A1 EP2467688 A1 EP 2467688A1
Authority
EP
European Patent Office
Prior art keywords
temperature
resonant element
dynamic
resonant
resonance
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Withdrawn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
EP10752743A
Other languages
German (de)
English (en)
Inventor
Bert Wall
Richard Grünwald
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.)
Microchip Frequency Technology GmbH
Original Assignee
Vectron International 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=43085957&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2467688(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Vectron International GmbH filed Critical Vectron International GmbH
Publication of EP2467688A1 publication Critical patent/EP2467688A1/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Withdrawn legal-status Critical Current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
    • G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
    • G01K11/22—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects
    • G01K11/26—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies
    • G01K11/265—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using measurement of acoustic effects of resonant frequencies using surface acoustic wave [SAW]
    • 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

Definitions

  • the invention relates to a measuring system for wireless position-independent measurement of the temperature of the loading of the furnace with high accuracy by means of passive temperature sensor.
  • the concept of loading the furnace can be very broad here. Areas of application are industrial processes in which workpieces have to be heated to specified minimum temperatures or have to pass through a specific temperature profile.
  • printed circuit boards can be used in a soldering oven.
  • the oven can also be, for example, a cooking appliance for cooking food.
  • the exact knowledge of the temperature of the load can be used to shorten the process times, saving energy, predicting the duration of the process, reducing the heat load and optimizing the temperature processes.
  • EP 1 882 169 B1 discloses a device for measuring a torque with resonance elements whose resonance frequency depends on both the torque and the temperature. In order to determine the torque with high accuracy, the influence of the temperature must be eliminated, whereby additional temperature measurement is necessary. For the temperature measurement by measuring the difference of the frequency of 3 resonances, the associated resonators must have a different temperature response. To achieve this, they must be different in their structure and not just in frequency. This is achieved by using a different cut of the substrate material or by varying the propagation direction within a cut. Thus, EP 1 882 169 B1 uses a 34 ° quartz cut and for the resonances 2 and 3 a propagation direction of -45 ° or 0 to 30 °. As a result, the ratio of the dynamic inductance and the dynamic capacitance of the resonators changes significantly at the same resonant frequency and unchanged resonator design.
  • DE 10 2007 020 176 A1 proposes a measuring system for measuring the temperature in continuous furnaces.
  • a plurality of polling antennas are used to secure the radio transmission in the oven room.
  • the temperature is determined from the temperature-dependent natural frequency of a surface acoustic wave device.
  • the disadvantage here is also the already mentioned above dependence of the accuracy of the measurement of the design of the transmission path.
  • a pressure sensor operating with surface wave components uses the difference frequency of three surface acoustic wave resonators for pressure determination.
  • the invention is based on the object to provide a measuring system that measures the temperature of the loading of a furnace within the oven chamber with little error wirelessly, position-independent and continuously. Description of the invention
  • the invention comprises a measuring system with an interrogation unit outside the furnace chamber, one or more interrogation antennas located in the furnace chamber and at least one passively operated freely movable temperature sensor with sensor antenna having at least one temperature sensor designed as a resonator for wireless measurement of the temperature of the loading of the furnace chamber.
  • the temperature sensor has at least two resonances with different temperature coefficients of the frequency and the resonant elements are to be designed such that their electrical equivalent circuit diagrams differ only slightly from each other.
  • the temperature is not determined by the frequency position of the individual resonances, but by the difference in the frequency of the resonances.
  • the frequency of the individual resonances can now be changed by influences of the transmission path of the radio interrogation (antenna near field effects) or by mismatches between sensor antenna and temperature sensor. However, the change is approximately identical because of the approximately identical electrical equivalent circuit diagram of the resonance elements. The difference frequency of the individual resonances is thus not affected. That measurement signal is stable.
  • the resonance elements are designed so that their resonant frequency in the working temperature range identifies a minimum distance, which allows the resonances to uniquely assign the resonance elements.
  • the temperature coefficients of the resonance frequency of the resonance elements must differ from one another. To one To obtain a clear assignment of the difference frequency to the temperature, the derivative of the difference frequency must not have a zero point after the temperature.
  • the difference between the resonance frequencies over the temperature is linearly increasing or linearly decreasing. This makes it possible to design the measuring system so that the measuring error in the working temperature range is as constant as possible.
  • the achievable measurement accuracy of the system is determined by the quality of the resonance elements. Therefore, it is particularly advantageous to design the resonance elements as surface wave resonators or bulk wave resonators. These working with acoustic waves resonators have a high quality with low heat capacity and low H first 11 costs.
  • a particularly advantageous solution is the design of the resonance elements as surface wave resonators.
  • the resonance elements can be designed to be particularly small and with particularly low heat capacity.
  • the size of the resonators generally decreases with increasing resonance frequency.
  • the demands on process stability increase with increasing frequency and the quality of the Resonance elements decreases.
  • the frequency range at 433.92 MHz represents a particularly favorable compromise.
  • a particularly advantageous solution is to integrate the sensor antenna in the temperature sensor. This allows the temperature sensor designed to be particularly small. Since this solution is generally associated with higher losses in the probe antenna, this solution is particularly advantageous for applications with particularly low range requirements.
  • a number of applications such as the measurement of the temperature profile of food to be cooked in a cooking appliance from the surface of the food to the interior of the food, in which at least two temperature sensors must be included in the temperature sensor for the measurement of the temperature profile. Furthermore, one can further increase the accuracy of the measurement with the integration of further temperature sensors in the temperature sensor and evaluation of the measurement result of all temperature sensors. Therefore, a temperature sensor with more than one temperature sensor is a particularly advantageous embodiment of the invention.
  • the resonance elements of the individual temperature sensors must be designed so that their resonance frequency in the working temperature range identifies a minimum distance, which allows the resonances to uniquely assign the resonance elements ,
  • a measuring system with more than one temperature sensor represents a particularly advantageous embodiment of the invention.
  • the inventive system for wireless measurement of the temperature of the load in an oven comprising: an interrogation unit, one or more interrogation antennas, which are positionable within the oven space, a passively operated temperature sensor with a sensor antenna and at least one designed as a resonator temperature sensor, wherein the temperature sensor is positionable within the furnace chamber, and an evaluation unit, wherein the temperature sensor has at least a first resonant element and a second resonant element, wherein the first resonant element and the second resonant element are formed such that at 20 ° C, the dynamic capacitance of the first resonant element to each differ less than 50% (more preferably 20%, more preferably 15%) from the dynamic capacity of the second resonant element.
  • the dynamic inductance of the first resonant element differs by less than 50% (more preferably 20%, more preferably 15%) from the dynamic inductance of the second resonant element. Furthermore, the dynamic resistance of the first resonant element differs by less than 50% (more preferably 20%, more preferably 15%) from the dynamic resistance of the second resonant element.
  • Dynamic resistance is often also referred to as dynamic loss resistance or as resonance resistance.
  • the evaluation unit is designed to determine the temperature of the loading of the furnace from the difference of the resonance frequency of the first resonance element and the resonance frequency of the second resonance element.
  • each of the dynamic capacity of the first resonant element differs by less than 10% (more preferably 7%, more preferably 4%) from the dynamic capacity of the second resonant element.
  • each of the dynamic inductance of the first resonant element differs by less than 10% (more preferably 7%, more preferably 4%) from the dynamic inductance of the second resonant element.
  • each of the dynamic resistance of the first resonant element differs by less than 10% (more preferably 7%, more preferably 4%) from the dynamic resistance of the second resonant element.
  • the dynamic resistance of the first resonant element differs from the dynamic resistance of the second resonant element.
  • the dynamic inductance of the first differs from the dynamic inductance of the first.
  • the dynamic capacity of the first resonant element differs from that of the dynamic capacitance of the second resonant element. At least one of the dynamic resistance, dynamic inductance, and dynamic capacity parameters of the first resonant element is different from the respective parameter of the second resonant element.
  • the product of the dynamic inductance and the dynamic capacity of the first resonant element in the temperature range between 0 0 C and 250 0 C by at least 0.01% (more preferably 0.05%, more preferably 0.1%) from the product of the dynamic inductance and the dynamic capacity of the second resonant element.
  • the resonant frequency of the first resonant element is different from the resonant frequency of the second resonant element in the (preferably total) range of 20 ° C to 200 ° C.
  • the difference of the resonance frequencies of the resonance elements in the range 20 ° C to 200 ° C is steadily increasing or steadily decreasing.
  • the difference of the resonance frequencies of the resonance elements in the range 20 ° C to 200 ° C is linearly increasing or decreasing linearly.
  • the amount of derivative of the resonant frequency after the temperature of the first resonant element in the entire range of 20 ° C to 200 ° C is greater than the amount of derivative of the resonant frequency after the temperature of the second resonant element.
  • the amount of derivative of the resonant frequency according to the temperature of the first resonant element is preferably in the entire range 20 ° C to 200 ° C less than the amount of derivative of the resonant frequency after the temperature of the second resonant element.
  • the resonance elements are designed as surface acoustic wave resonators or as bulk wave resonators.
  • the resonant elements are formed on a chip or on different chips.
  • the resonance frequencies of the resonance elements in the working temperature range are formed in an ISM band.
  • the resonance frequencies of the resonant elements in the ISM band are formed at 433.92 MHz or in the ISM band at 915 MHz.
  • the sensor antenna is integrated in the temperature sensor or executed separately.
  • more than one temperature sensor is disposed within the temperature sensor.
  • the system according to the invention preferably has more than one temperature sensor.
  • the temperature sensor is permanently fixed to the loading of the furnace.
  • the temperature sensor is reversibly fixed to the loading of the furnace.
  • Fig. 2 Electrical equivalent circuit diagram of the temperature sensor used
  • 3 shows an electrical equivalent circuit diagram of a surface acoustic wave sensor with two resonances for determining the temperature across the difference frequency of the resonances; 4: Frequency response of the surface acoustic wave resonator used as a temperature sensor of a conventional measuring system for wireless passive measurement of the temperature in household appliances, and
  • Fig. 5 Temperature response of two resonance elements with an acoustic
  • FIG. 1 an embodiment of the measuring system according to the invention for wireless position-independent measurement of the temperature of the loading of the furnace with high accuracy by means of passive temperature sensor is shown.
  • the furnace is designed here as an industrial furnace 1.
  • the furnace chamber 11 is closed in the oven operation with the door 12.
  • the interrogation antenna 14 and the wireless temperature sensor 15 of the measuring system are connected to the furnace chamber of the furnace.
  • the workpiece 2 is a load in the furnace chamber of the furnace.
  • the wireless temperature sensor is in thermal contact with the workpiece.
  • the interrogation unit of the measuring system is integrated in the control electronics of the furnace 13.
  • the furnace chamber of the furnace has a connection to a heating and air circulation module 16.
  • the heating and air circulation module is controlled by the control electronics of the furnace so that the temperature of the workpiece passes through a predetermined temperature profile.
  • the current temperature of the workpiece while the temperature profile is driven, as a controlled variable.
  • the current temperature of the workpiece is measured wirelessly using the measuring system according to the invention.
  • RF signals are generated by the interrogation unit and sent via the interrogation antenna 14 to the wireless passive temperature sensor 15.
  • the RF signals are passed on to the temperature sensor via the sensor antenna of the temperature sensor 15.
  • Temperature sensor includes at least 2 resonant elements, which are electrically connected to the antenna antenna. Parts of the interrogation signal are temporarily stored in the resonance elements and radiated again via the sensor antenna.
  • the resonant frequency of the resonant elements is determined.
  • the temperature is determined from the difference of the resonance frequencies of the resonance elements.
  • the resonance elements are designed so that their electrical equivalent circuit diagrams differ only slightly.
  • R m1 , L m i and C m i map the dynamic resistance, the dynamic inductance and the dynamic capacity.
  • C 0 stands for the static capacitance of the resonator.
  • Ro forms the ohmic resistance of the supply line of the resonator.
  • R m i, m i L i and C m are also dependent on temperature because of the dependence of the resonance frequency of the resonator on the temperature. In conventional wireless passive temperature sensors, these surface acoustic wave resonators are switched between antenna and ground.
  • the surface acoustic wave resonator is terminated with the impedance of the antenna.
  • the impedance of the antenna can be changed position-dependent by near-field effects.
  • the resonator is detuned.
  • the resonance frequency changes position-dependent. It creates a measurement error.
  • the electrical equivalent circuit diagram of a sensor operating with surface acoustic waves sensor with 2 resonances for determining the temperature across the difference frequency of the resonances is shown in Fig. 3. Both resonance elements are connected in parallel.
  • R m1 , L m i and C m i map the dynamic resistance, the dynamic inductance and the dynamic capacity of the first resonance element.
  • Rm2, Lm2 and C m 2 are the dynamic resistance, the dynamic inductance and the dynamic capacity of the second resonance element.
  • C 0 stands for the static Capacity of the parallel connection of both resonance elements.
  • Ro maps the ohmic resistance of the supply line to both resonance elements.
  • the resonance frequency of both resonance elements is temperature-dependent. However, the dependence of the resonance frequency on the temperature is different.
  • both R m1 , L m i and C m i and R m2 , L m2 and C m2 are temperature dependent, but with different degrees of temperature dependence.
  • the sensor is electrically connected between the sensor antenna and ground in a wireless passive temperature sensor.
  • Both resonant elements are terminated with the same impedance.
  • a change in the impedance of the antenna occurs in the furnace chamber as a function of the position due to near field effects.
  • Both resonant elements are pulled in frequency.
  • the resonance frequencies change.
  • the change of the resonance frequency depends on the values of the spare elements of the resonance elements.
  • the pulling of the frequency of both resonant elements occurs either towards higher or lower frequencies.
  • the resulting measurement error is generally lower compared to a temperature sensor with only one resonance element.
  • the measurement error tends to zero when the replacement elements R m i, L m i and C m i of the first resonant element and R m 2, L m 2 and C m 2 of the second substitute element differ only slightly according to the invention.
  • R m i, L m i and C m i with R m2 , L m2 and C m 2 can never be, since otherwise the resonance frequencies of resonance element 1 and resonance element 2 would not differ.
  • the different temperature response of the resonance elements 1 and 2 is achieved mainly by the use of different crystal sections, or different propagation directions of a crystal cut. The associated different material parameters of the crystals lead to an increased design effort to design resonance elements with approximately identical replacement elements.
  • fp $ i is the resonant frequency of a first resonant element of a temperature sensor used in the wireless passive temperature sensor in the operating temperature range of the temperature sensor and fR2 the resonant frequency of a second resonant element.
  • the temperature response and the frequency position of the two resonance elements is chosen so that the resonant frequencies of both resonant elements have a minimum distance from each other within all operating temperatures and an unambiguous assignment of the difference frequency of both resonant elements to the temperature of the temperature sensor is possible.
  • the resonance frequencies were chosen so that the resonance frequencies of both resonance elements in the entire operating temperature range within the ISM band at 433.92 MHz.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Measuring Temperature Or Quantity Of Heat (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)

Abstract

L’invention concerne un système de mesure permettant la mesure, sans fil et indépendamment de la position, de la température de la charge d’un four à un haut niveau de précision au moyen de sondes de température passives. Le système de mesure permettant la mesure sans fil de la température de denrées alimentaires ou de pièces dans un four présente une unité d’interrogation située à l’extérieur de l’espace du four, une ou plusieurs antennes d’interrogation se trouvant dans l’espace du four et au moins une sonde de température à commande passive, librement mobile à l’intérieur du four, comportant une antenne de sonde et au moins un capteur de température réalisé sous la forme d’un résonateur. Le système selon l’invention est caractérisé en ce que le capteur de température présente au moins 2 résonances à coefficients thermiques différents, les circuits électriques équivalents des éléments de résonance présentant très peu de différences.
EP10752743A 2009-08-19 2010-08-19 Système de mesure permettant la mesure d une température sans fil et indépendamment de la position Withdrawn EP2467688A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009028664 2009-08-19
DE102009056060A DE102009056060B4 (de) 2009-08-19 2009-11-23 Messsystem zur drahtlosen positionsunabhängigen Messung der Temperatur
PCT/EP2010/062120 WO2011020888A1 (fr) 2009-08-19 2010-08-19 Système de mesure permettant la mesure d’une température sans fil et indépendamment de la position

Publications (1)

Publication Number Publication Date
EP2467688A1 true EP2467688A1 (fr) 2012-06-27

Family

ID=43085957

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10752743A Withdrawn EP2467688A1 (fr) 2009-08-19 2010-08-19 Système de mesure permettant la mesure d une température sans fil et indépendamment de la position
EP10173413.5A Active EP2287584B1 (fr) 2009-08-19 2010-08-19 Système de mesure pour la mesure sans fil indépendante de la position de la température d'un objet de mesure

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10173413.5A Active EP2287584B1 (fr) 2009-08-19 2010-08-19 Système de mesure pour la mesure sans fil indépendante de la position de la température d'un objet de mesure

Country Status (5)

Country Link
US (1) US8930160B2 (fr)
EP (2) EP2467688A1 (fr)
CN (1) CN102695948B (fr)
DE (1) DE102009056060B4 (fr)
WO (1) WO2011020888A1 (fr)

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FR3039708B1 (fr) 2015-07-31 2019-08-09 Senseor Resonateur a ondes elastiques de surface simple port sur substrat a forte permittivite
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DE102016014286A1 (de) * 2016-11-28 2018-05-30 KVB Institut für Konstruktion und Verbundbauweisen gemeinnützige GmbH Einrichtung zur drahtlosen Erfassung von Prozessdaten bei der thermischen Behandlung von Werkstücken in einem Autoklaven zur Wärmebehandlung von Werkstoffen
US10551056B2 (en) 2017-02-23 2020-02-04 Whirlpool Corporation Burner base
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FR3066591B1 (fr) 2017-05-19 2020-10-16 Senseor Procede d'optimisation de conception d'un dispositif comprenant des moyens d'interrogation et un capteur passif interrogeable a distance
US10641498B2 (en) 2018-01-08 2020-05-05 Haier Us Appliance Solutions, Inc. Antenna device for a wireless probe system of an oven appliance
CN108664445B (zh) * 2018-04-16 2022-11-25 深圳和而泰小家电智能科技有限公司 一种温度计算方法及电子设备
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Also Published As

Publication number Publication date
CN102695948A (zh) 2012-09-26
US20120143559A1 (en) 2012-06-07
EP2287584A1 (fr) 2011-02-23
DE102009056060B4 (de) 2011-09-22
EP2287584B1 (fr) 2015-01-28
US8930160B2 (en) 2015-01-06
DE102009056060A1 (de) 2011-03-10
WO2011020888A1 (fr) 2011-02-24
CN102695948B (zh) 2014-12-03

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