WO2015113086A1 - Capteur servant à détecter un dépassement unique et temporaire d'une température seuil - Google Patents

Capteur servant à détecter un dépassement unique et temporaire d'une température seuil Download PDF

Info

Publication number
WO2015113086A1
WO2015113086A1 PCT/AT2015/050011 AT2015050011W WO2015113086A1 WO 2015113086 A1 WO2015113086 A1 WO 2015113086A1 AT 2015050011 W AT2015050011 W AT 2015050011W WO 2015113086 A1 WO2015113086 A1 WO 2015113086A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
sensor element
permanent magnet
carrier
state
Prior art date
Application number
PCT/AT2015/050011
Other languages
German (de)
English (en)
Inventor
Wolfgang Müllner
Gernot Schmid
Original Assignee
Seibersdorf Labor 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 Seibersdorf Labor Gmbh filed Critical Seibersdorf Labor Gmbh
Priority to EP15705894.2A priority Critical patent/EP3063516A1/fr
Publication of WO2015113086A1 publication Critical patent/WO2015113086A1/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
    • G01K7/36—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils
    • G01K7/38—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using magnetic elements, e.g. magnets, coils the variations of temperature influencing the magnetic permeability
    • 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
    • G01K3/005—Circuits arrangements for indicating a predetermined temperature
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2203/00—Decoration means, markings, information elements, contents indicators
    • B65D2203/10—Transponders
    • 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
    • G01K2207/04—Application of thermometers in household appliances for measuring food temperature for conservation purposes

Definitions

  • the invention relates to a sensor for detecting the single temporary transgression of a threshold temperature Ts, according to the preamble of patent claim 1.
  • Temperature monitoring units according to the invention are used in particular for monitoring biological material or for monitoring cold chains of foods or medical products.
  • the uninterrupted monitoring of a cold chain along production, transport and storage processes is essential for ensuring product quality in many areas, such as the food and pharmaceutical industries, as well as in medicine.
  • To ensure product quality it must be ensured in most cases that the temperature of the goods to be cooled is within a narrow tolerance range around an optimum temperature and that the temperature of the goods does not leave this tolerance range along the entire process or transport path.
  • a single temporary leaving this tolerance temperature range can already lead to sustained damage or loss of quality of the product or refrigerated goods.
  • optimum temperature for example -18 ° C
  • a single short thawing could lead to premature spoilage and thus a health risk to consumers.
  • the situation is often much more critical in the field of the pharmaceutical industry (temperature-sensitive drugs or active substances) and medicine (for example blood preserves, biological materials). There is thus great interest in low-cost, seamless monitoring of cold chains in many industrial or market sectors.
  • RFID-based systems for seamless cold chain monitoring consisting typically of a simple electronic circuit with a temperature sensor, which are connected to an RFID transponder or integrated into an RFID transponder, are known from the prior art.
  • a practically significant problem of current systems is that this electronic circuit has a own power supply, usually a battery, needed to ensure the complete usually electronic temperature monitoring, eg a temperature monitoring in which the temperature is measured and stored in certain time intervals.
  • This fact makes the transponder relatively expensive and therefore only limited for bulk goods used and as a long storage at low temperatures reduces the operating life of batteries, is usually necessary for long storage times, the batteries.
  • battery-containing RFID transponders are also problematic with regard to their disposal.
  • alloys are known from the current state of materials engineering, e.g. magnetocaloric alloys or shape-memory alloys that change their magnetic properties when exceeding or falling below certain threshold temperatures.
  • materials engineering e.g. magnetocaloric alloys or shape-memory alloys that change their magnetic properties when exceeding or falling below certain threshold temperatures.
  • certain Mn-Ni-Sn-Co alloys when passing a certain threshold temperature Ts, show a transition from the paramagnetic state (relative permeability ⁇ 1) to a ferromagnetic state (relative permeability »1) or vice versa. This change in magnetic material properties is due to first-order phase transitions in the alloy.
  • Patent specification EP 2280262 A1 describes a temperature monitor based on the abovementioned material properties. Specifically, this is a long-used by electronic article surveillance systems (EAS) akustomagneticians principle recourse. This principle is based on the phenomenon of magnetostriction, i. that special materials undergo a change in length by magnetization, or vice versa, the mechanical vibrations of a magnetostrictive material generates an alternating magnetic field.
  • a magnetostrictive resonator e.g. a resonant-length material chip may therefore be excited to mechanical vibration by an external alternating magnetic field (at resonant frequency, e.g., 58 kHz).
  • EP 2280262 AI As an advantage of the invention in EP 2280262 AI above all the low cost and thus the use in the mass market are cited.
  • An obvious drawback from a practical point of view is that the arrangement described in EP 2280262 A1 is a parallel solution to established RFID methods, ie, the (acoustomagnetic) temperature monitor can not meaningfully be integrated into RFID transponders and requires a separate (acoustomagnetic) readout unit becomes. That is, in addition to the RFID technology already established in many transportation and production lines, the acoustomagnetic readout method must be installed and integrated into the logistics system.
  • the aim of the invention is therefore to produce a sensor which overcomes the disadvantages arising from the prior art.
  • the invention solves this problem with a It is provided that the sensor for detecting the single temporary transgression of a threshold temperature Ts, at least one sensor element comprising a sensor material consisting of a magnetocaloric alloy, wherein the sensor material of the sensor element when exceeded the threshold temperature Ts passes from a first state to a second state and in the first state relative to the second state has different magnetizability, wherein a detection unit is provided, with the indirectly or directly the transition of the sensor material of the sensor element from the first state to the second state detectable is.
  • the read-out of the states of the sensor and the sensor material is facilitated by the detection unit, in particular passive, RFID and / or NFC transponder for data transmission to an external data communication device, downstream of the respective state of the sensor element when activated by the external data communication device transmits the data communication device.
  • the exceeding or falling short of the predetermined threshold temperatures can thus be detected directly via the RFID interface, without additional effort.
  • the sensor material of the sensor element has a first-order phase transition and is magnetic in at least one phase, and / or has a broad temperature hysteresis.
  • the detection unit comprises at least one coil, wherein the sensor element is arranged in the field space of the coil and electrically insulated therefrom, and wherein the detection unit for measuring an inductance change of the coil with the coil electrically connected.
  • the space requirement of the sensor is reduced when the sensor element is designed as the core of the coil and / or that the sensor element is designed as a carrier body of the coil.
  • the detection sensitivity can be increased by the sensor having two coils, namely a stimulator coil and a measuring coil, wherein the sensor element is designed as a magnetic coupling element and is preferably formed as a common core of the two coils or as a carrier material of the two coils and / or the sensor element is arranged between the two coils.
  • An alternative sensor device according to an electromechanical principle is provided in that the sensor has an at least partially electrically conductive carrier part, two electrical contacts and a magnet, wherein the detection unit is designed to detect a conductive connection of the electrical contacts, wherein the sensor element on the carrier part is the magnet is arranged opposite, wherein the sensor element in the second state can be brought into interaction with the magnet and the carrier part connects the contacts.
  • An external cooling for activating the sensor element is omitted if the sensor has an activation unit for activating the sensor element comprising a soft magnetic material and a preferably mounted on the soft magnetic material coil and wherein the soft magnetic material is magnetizable through the coil, wherein the hysteresis curve and / or the threshold temperature Ts of the sensor element is displaceable by the magnetized soft magnetic material.
  • the sensor has a base body made of non-electrically conductive material, a non-ferromagnetic carrier mounted on the base body, in particular rotatable, tiltable or translational, on which the sensor element is arranged, at least one on the Body arranged first permanent magnet and at least one arranged on the carrier permanent ferromagnetic first piece of material, wherein the first piece of material is disposed in the active region of the first permanent magnet, wherein the sensor element changes the position of the carrier when changing from the first state to the second state, wherein the detection unit is designed to measure the position of the carrier comprises.
  • a particularly flat sensor is provided when the carrier, in particular in the form of a cylindrical disk, is arranged rotatably on the base body and on the carrier a first sensor element with threshold temperature Tsi, a second sensor element with threshold temperature Ts 2 and one to the second sensor element subsequently arranged permanently ferromagnetic material piece is arranged, wherein the threshold temperature Tsi> Ts 2 and / or Tui ⁇ T u2 , on the base body of the first permanent magnet, a second permanent magnet and a third permanent magnet are arranged, wherein the third permanent magnet is formed and arranged that that the torque of the carrier caused by the magnetic interaction between the third permanent magnet, the permanent ferromagnetic piece of material and the sensor material located in the second state is greater than that torque caused by the magnetic interaction between the second permanent magnets, the permanent ferromagnetic material piece and the sensor material located in the second state is caused, and wherein the first sensor element is arranged on the carrier in the effective range of the first permanent magnet, and wherein the permanent ferromagnetic piece of
  • An alternative embodiment of the sensor device is achieved in that the carrier, in particular about its center, is arranged tiltably on the base body and at one end of the carrier a first sensor element with threshold temperature Tsi and on the first sensor element opposite end of the carrier second sensor element with threshold temperature Ts 2nd is arranged, wherein the threshold temperature Tsi> Ts 2 and / or Tui ⁇ Tu 2 , wherein on the base body, the first permanent magnet and a second permanent magnet are arranged, wherein a respective permanent magnet with respect to the first and second sensor element is arranged, wherein the first piece of material in Effective range of the first permanent magnet is arranged on the carrier and a second piece of material is arranged in the effective range of the second permanent magnet on the carrier.
  • the size of the sensor is further reduced if the carrier is arranged to be translationally movable on the base body between the first permanent magnet and a second permanent magnet, and at one end of the carrier a first sensor element with threshold temperature Tsi and on the first sensor element opposite end of the carrier second sensor element with threshold temperature Ts 2 is arranged, wherein the threshold temperature Tsi> Ts 2 and / or Tui ⁇ Tu 2 , wherein the first permanent magnet and the second permanent magnet are arranged on the base body, wherein a respective permanent magnet with respect to the first sensor element and the second sensor element is arranged wherein the first piece of material is arranged in the effective range of the first permanent magnet on the carrier and a second piece of material is arranged in the effective range of the second permanent magnet on the carrier.
  • a particularly suitable application of the sensor is provided if an RFID and / or NFC transponder comprising a sensor integrated in the RFID and / or NFC transponder according to one of the preceding claims.
  • Fig. 1 shows a first order phase transition of a magnetocaloric alloy.
  • Fig. 2 shows hysteresis curves of magnetocaloric alloys.
  • FIGS. 3a to 3c show three embodiments of the invention. 4 shows the structure of an RFID / NFC transponder according to the invention. 5a to 5c, 6 and 7 show further embodiments of the temperature sensor.
  • Figures 8a and 8b show an embodiment with electromechanical detection.
  • Fig. 9a shows an embodiment with activation unit.
  • Fig. 9b shows a shift of a hysteresis curve by application of an external magnetic field.
  • Fig. 10 shows hysteresis curves of sensor elements.
  • FIGS. 1 shows a first order phase transition of a magnetocaloric alloy.
  • Fig. 2 shows hysteresis curves of magnetocaloric alloys.
  • FIGS. 12a to 12c show the embodiment of the temperature monitor in the detection position shown in FIGS. 11a to 11c.
  • 13a shows a further embodiment of the temperature monitor in the starting position.
  • FIG. 13b shows the embodiment of the temperature monitor shown in FIG. 13a in the detection position.
  • Fig. 14a shows a further embodiment of the temperature monitor in the starting position.
  • FIG. 14b shows the embodiment of the temperature monitor shown in FIG. 14a in the detection position.
  • Fig. 1 shows so-called first-order phase transitions of a magnetocaloric alloy in which the material has a pronounced temperature hysteresis.
  • the transition from the paramagnetic to the ferromagnetic state occurs at higher temperature Ts than the return from the ferromagnetic state to the paramagnetic state at the temperature Tu-
  • the threshold temperature Ts for the phase transition, as well as the slope and the width of the temperature hysteresis curve can be determined by the alloy composition , adjust the manufacturing process of the alloy, as well as by thermal aftertreatment within certain limits.
  • hysteresis curves with widths of about 20-30 K at response temperatures in the range of about 120-600 K can be realized.
  • the magnetocaloric materials and shape memory alloys those are also known which show a so-called “virgin effect", ie the hysteresis curve and thus at least one Anp talk temperature looks different during the first cooling or where it is different than in the subsequent temperature cycles In the lower part of Fig. 2, for example, the solid curve shows the course of the magnetization during the first cooling, the dot-dash curve the course during reheating after the first cooling and finally the dashed curve the magnetization during the renewed cooling of the material ,
  • FIGS. 3a to 3c A first embodiment of a sensor according to the invention is shown in FIGS. 3a to 3c.
  • the sensor element 1 consisting of a magnetocaloric sensor material, is brought into the immediate vicinity of a coil 3.
  • the sensor element 1 forms, for example, the carrier body of the coil winding or the coil core (FIG. 3 a).
  • the coil 3 is formed as a flat coil, e.g. in the form of printed or photolithographically produced flat coils.
  • the sensor element 1 is applied to and / or below the coil 3 (FIGS. 3b and 3c).
  • the coil 3 is electrically insulated from the sensor element 1 by a foil or an insulator attached to the coil windings 31.
  • the inductance L of a coil 3 generally depends on the magnetic permeability of the field space immediately surrounding the coil 3, a change in the inductance L of the coil 3 is to be expected on the transition of the sensor material of the sensor element 1 from the paramagnetic to the ferromagnetic state.
  • This inductance change can be detected by a detection unit 5, as shown schematically in FIG. 4, with a simple electronic circuit.
  • the coil 3, the sensor element 1 and the detection unit 5 can, as shown in FIG. 4, be integrated into a low-cost, passive RFID and / or NFC transponder 4.
  • the information about the magnetic state of the sensor material of the sensor element 1 and thus the information as to whether the temperature threshold Ts has ever been exceeded can be based on the RFID technology wirelessly through a transponder 4 with antenna 43 via an RFID / NFC radio link 45 to an external data communication device 44 are transmitted (Fig. 4).
  • the detection of exceeding a predetermined threshold temperature Ts is based on a first-order phase transition of a magnetocaloric or shape memory alloy ("sensor element") .
  • sensor element a magnetocaloric or shape memory alloy
  • the detection of the magnetic state of the sensor element 1 and the associated change in the inductance of the coil 3 can be determined in various ways known from the prior art. These are in particular:
  • Embodiments of the invention are shown in FIGS. 5a to 5c, in which the exceeding of a threshold temperature Ts is indicated by changing the magnetic coupling of two coils 3a and 3b through the sensor element 1.
  • the sensor element 1 is brought as a magnetic coupling element in the immediate vicinity of the two coils (inductors).
  • the sensor element 1 forms, for example, a common carrier body of the coil windings 31 or a common coil core (FIG. 5 a).
  • the sensor element 1 can be applied to and / or below the two coils 3 (FIG. 5b, FIG. 5c).
  • One of the two coils serves as a commutator coil 3 a, the other as a measuring coil 3b.
  • the magnetic coupling or the mutual inductance between stimulator 3a and measuring coil 3b thus significantly depends on the magnetic properties of the sensor material of the sensor element 1.
  • the transition of the sensor material from the paramagnetic to the ferromagnetic state also increases the magnetic coupling of exciter 3a and measuring coil 3b.
  • An electrical current fed into the excitation coil 3a induces, in the case of the ferromagnetic state of the sensor material, a greater voltage in the measuring coil 3b than in the paramagnetic state of the sensor material.
  • the detector unit 5 measures this voltage difference and forwards it to a communication controller 42 or compares it, for example, with a comparison value stored in a memory 41.
  • the voltage change, a comparison value or a simple binary signal can then be transmitted on request of an external data communication device 44 by means of wireless RFID / NFC connection 45.
  • the voltage at the measuring coil 3b serves as an indicator for the magnetic state of the sensor material of the sensor element 1.
  • the coil arrangement comprising the coils 3a and 3b and the sensor element 1 and the detection unit 5 can in turn be converted into a low-cost, passive RFID and / or or NFC transponder can be integrated, so that the information about the magnetic state of the sensor material and thus the information as to whether the temperature threshold Ts has ever been exceeded can be wirelessly transmitted to an external data communication device 44 on the basis of RFID technology (FIG. 6).
  • FIG. 7 shows such an alternative arrangement.
  • the sensor element 1 is arranged between the two coils 3, whereby the voltage induced in the measuring coil 3b is increased or reduced.
  • FIGS. 8a and 8b Another embodiment of the invention is shown in Figs. 8a and 8b.
  • the transition of the sensor material of the sensor element 1 into the ferromagnetic state can also be detected in an electromechanical manner, as shown schematically in FIGS. 8a and 8b.
  • the sensor element 1 is applied to an elastic and non-ferromagnetic carrier 8 firmly clamped on one side and arranged at a small distance from a permanent magnet 9.
  • At least one part 81 of the carrier is electrically conductive, so that when the carrier 8 is deflected in the direction of two contact springs 6 and 7 opposite the metallic carrier part 81, the two contact springs 6 and 7 are electrically conductively connected.
  • FIGS. 3 to 8 can be integrated in thin RFID transponders constructed in the form of multi-layered foils, wherein in principle no restriction to a specific RFID technology is necessary.
  • preferred RFID frequency bands or technologies are those currently used in supply chain and process chain management, ie inductive coupling and load modulation based technologies in the frequency ranges 120-140 kHz, and 13-14 MHz, as well as on Backscatter coupling based RFID technologies in the UHF range of 800-1000 MHz and in the microwave range of 2.4-2.5 GHz.
  • Using 13.56 MHz NFC-compatible RFID technology would not only provide manufacturers and suppliers with the ability to detect cold chain interruptions, but also consumers.
  • any consumer equipped with an NFC-enabled mobile phone and associated application could check directly on site, for example in the grocery store or in the pharmacy, whether the frozen food or chilled goods selected by him were completely cooled below a predetermined critical threshold temperature Ts.
  • activation, arming, of the sensor is necessary, which is explicitly necessary whenever the manufacturing or storage temperature of the sensor element 1 is above the upper temperature threshold Ts to be monitored. which is usually the case with sensors for monitoring cold chains.
  • the sensor material of the sensor element 1 is already in the ferromagnetic state before attaching the sensor to the product to be monitored and must first be brought into the paramagnetic state. If this is possible with regard to the product to be monitored, this may be done by cooling the product with the sensor attached below Tu after attaching the sensor to the product. If this is not possible, then the previously activated sensor element 1 can be applied to the already cooled below Ts product immediately before mounting.
  • the senor may be attached to the product even at temperatures above Ts and cooled together with the product to the set temperature range between Tu and Ts. Subsequently, the sensor element 1 can be activated by local cooling below Tu. With a superficial arrangement of the sensor element 1 on the sensor, in particular in the case of a film-like sensor structure, the local cooling of the sensor element 1 required for activation can take place, for example, by targeted spraying with cold spray or by contact with a cold source.
  • FIG. 9a An example of a suitable arrangement is shown in FIG. 9a in a schematic side view.
  • the embodiment described in FIG. 9 a has a similar construction to the embodiment described in FIG. 6.
  • the sensor integrated in a transponder 4 has an activation unit 12 with soft magnetic material 14 and a coil 13 wound around it.
  • the soft magnetic material 14 is unmagnetized in the initial state, after mounting the sensor on already cooled product in the temperature range between the lower temperature threshold Tu and the threshold temperature Ts and has a remanent flux density of zero. Without magnetization by a permanent magnetic field, at least the transition temperature from the paramagnetic to ferromagnetic state of the sensor element 1 is above the storage temperature or production temperature Tp of the sensor (FIG. 9b) and thus at the same time very far above the temperature threshold Ts to be monitored.
  • the sensor After attaching the sensor to the refrigerated goods and cooling to the target temperature T (Tu ⁇ T ⁇ Ts), the sensor is activated by magnetization of the soft magnetic material 14, by the activation unit 12 with coil 13, since thereby the remaining soft magnetic material 14 Remanenzpound réelle the sensor element 1 is magnetized so far that the hysteresis curve shifts into the area of application of the sensor (Tu ⁇ T ⁇ Ts).
  • the magnetization of the soft magnetic material 14 may alternatively be done from the outside by a placed in the vicinity of the sensor element 1 permanent or electromagnet or via the external data communication device 44, as shown in Fig. 9, for example in the course of initialization / introduction into the RFID-monitored supply Chain Management System.
  • monitoring of the undershooting of a threshold temperature Tu can also be used when selecting corresponding sensor materials of the sensor element 1, or the transition from magnetic to paramagnetic state can be detected and used to indicate that the temperature has fallen below a minimum.
  • FIGS. 11a to 14b show further embodiments of the invention.
  • sensors for detecting the one-time temporary overshoot of a threshold temperature Ts without the need for an explicit activation of the sensor realized.
  • the embodiment shown in FIGS. 11a to 11c comprises a main body 10 of non-electrically conductive and non-ferromagnetic material and a non-ferromagnetic carrier 11 which is rotatably mounted on the main body 10 and which is designed as a circular disk.
  • a first sensor element 1a connected thereto is composed of a magnetocaloric sensor material with pronounced temperature hysteresis and transition from the ferromagnetic state to the paramagnetic state at the lower temperature threshold Tui and temperature threshold Tsi (FIG.
  • a second sensor element 1b a magnetocaloric sensor material with very little or no temperature hysteresis and response temperature Ts 2 slightly above Tui (Fig. 10) attached.
  • a first permanent ferromagnetic piece of material Fl is further applied.
  • the first sensor element 1a is arranged diametrically opposite the first permanent ferromagnetic material piece F1 on the circumference of the carrier 11, the second sensor element 1b likewise lies, like the first material piece F1, on the circumference of the carrier 11 and closes against the first permanent ferromagnetic material piece F1 at.
  • the base body 10 On the base body 10 is a, in each case fixedly connected to the base body 10, the first permanent magnet Ml, second permanent magnet M2 and third permanent magnet M3 mounted, wherein the third permanent magnet M3 stronger, a higher holding force or magnetization has or is greater than the second permanent magnet M2.
  • the first permanent magnet Ml is arranged on the base body 10 with respect to the first sensor element 1a, or in its effective range.
  • the second permanent magnet M2 is fastened to the first permanent ferromagnetic material piece F1, attracts it and aligns the carrier 11.
  • the larger third permanent magnet M3 is arranged in the effective region of the second sensor element 1b and is spaced therefrom along the circumference of the carrier 11.
  • contacts 6 and 7 are fastened with electrical conductor tracks to the detection unit 5 on the base body 10 and an electrically conductive surface 15 for the capacitive determination of the carrier position on the Bottom of the carrier 11 attached.
  • electrical conductor tracks to the detection unit 5 on the base body 10 and an electrically conductive surface 15 for the capacitive determination of the carrier position on the Bottom of the carrier 11 attached.
  • 11a to 11c show different views and illustrations of this embodiment of the invention in the starting position, which is produced in the production of the sensor device, it being assumed that an ambient temperature T> Tsi prevails in the production of the sensor (see FIG. , Both the sensor material of the first sensor element 1a and the sensor material of the second sensor element 1b are thus in the ferromagnetic state. If the first sensor element la supplied in the ferromagnetic state for sensor mounting, it is sufficient in the sensor mounting and an ambient temperature between Tui and Tsi. On the base body 10, the three permanent magnets Ml, M2 and M3 are arranged.
  • the first sensor element la and the first permanent magnet Ml are arranged such that the first sensor element la is held by the magnetic forces of the first permanent magnet Ml in its immediate vicinity and the first permanent-ferromagnetic piece of material Fl is held by the magnetic forces of the second permanent magnet M2 in its immediate vicinity.
  • the second sensor element lb is arranged such that the third permanent magnet M3 in the direction of rotation to the third permanent magnet M3, the second sensor element lb.
  • the ratios of the size and magnetic forces of the permanent magnets Ml, M2, M3 and the first piece of material Fl, and their arrangement, and the size and permeability of the first and second sensor elements la, lb, in the ferromagnetic state are coordinated such that the in Fig 11a to 11c can be produced during the sensor production and remains stable for T> Tui, the third permanent magnet M3 being made stronger / larger than the second permanent magnet M2.
  • the sensor can be mounted on the refrigerated goods even at temperatures> Tui.
  • Ts 2 first the sensor material of the second sensor element 1b loses its ferromagnetic properties, and immediately afterwards also the sensor material of the first sensor element 1a (see FIG.
  • the carrier 11 is thereafter held exclusively in a position corresponding to the starting position by the magnetic forces exerted on the first permanent ferromagnetic material piece F1 by the second permanent magnet M2.
  • the sensor is now activated or "armed” in this state If it is exceeded in this activated state the threshold temperature Ts 2 , the sensor material of the second sensor element lb ferromagnetic and there is a resulting attractive force of the second sensor element lb in the direction of the stronger third permanent magnet M3. Due to the now lack of force between the first permanent magnet Ml and the first sensor element la, there is a rotational movement of the carrier 11, so that the second sensor element lb and the first permanent-ferromagnetic piece of material Fl come to lie in close proximity to the third permanent magnet M3.
  • the detection position is maintained even if Tsi is exceeded and the first sensor element la changes to the ferromagnetic state ,
  • the determination of the position of the carrier 11 or the detection of the detection position can take place in various ways known from the prior art. In the embodiment illustrated in FIGS. 11a to 11c and 12a to 12c, this takes place on the basis of a change in the capacitance, conductivity or impedance between two electrodes 6 and 7 mounted or printed on the base body 10. This change results directly from the detection position over the electrodes 6 and 7 located metal surface 15, which is arranged on the underside of the carrier 11 at a corresponding location.
  • the connection lines of the electrodes 6 and 7 are fed to a detection unit 5 integrated in an RFID transponder (compare FIGS. 4 and 6).
  • inductive methods according to the principles shown in FIGS. 3 and 5 as well as contact-based detection methods on (spring) contacts, position switches, etc. possible.
  • an automatically activating RFID compatible temperature monitor for cold chain monitoring can be realized.
  • FIGS. 13a, 13b An alternative and particularly simple embodiment of a self-activating temperature monitor based on magnetocaloric principles is shown in FIGS. 13a, 13b in a side view.
  • a base body 10 On a base body 10, two permanent magnets Ml and M2 and a support 16 for a carrier 11 are attached in the form of a two-sided lever.
  • the lever protrudes on each side in each case via one of the permanent magnets Ml or M2.
  • a first permanent ferromagnetic material or metal piece F1 At one end of the lever, in the region of the first permanent magnet M1, a first permanent ferromagnetic material or metal piece F1, as well as a first sensor element 1a are fastened.
  • the lever is positioned in the starting position. Due to the magnetic force effect, this starting position remains stable as long as the torque generated by the first permanent magnet M1, the first permanent ferromagnetic material piece F1 and the first sensor element 1a is greater than that by the second permanent magnet M2, the second permanent ferromagnetic material piece F2 and the second sensor element lb generated torque.
  • the force ratios or torque ratios are adjustable by the choice and position of the permanent magnets Ml, M2, or the permeabilities of the sensor materials of the sensor elements la, lb and the permanent ferromagnetic materials Fl, F2 and their position along the lever. In the form / initial position shown in FIGS.
  • the senor can be mounted on the goods to be cooled (even at temperatures> Tsi).
  • Tsi temperatures> Tsi
  • first the second sensor element 1b loses its ferromagnetic properties and immediately thereafter also the first sensor element 1a (see FIG.
  • the carrier 11 is thereafter held in a position corresponding to the initial position exclusively by a resultant torque exerted by the permanent magnet first M1 and the first permanent ferromagnetic material piece F1.
  • the second sensor element 1b becomes ferromagnetic and the torque ratios change as a result of the magnetic force now acting on the second permanent magnet With suitable dimensioning, a resulting torque occurs, so that the lever tilts in the direction of the second permanent magnet M2 into a detection position (FIG. 13b). With suitable dimensioning and positioning of the permanent ferromagnetic material pieces F1, F2 maintain this position of the lever stable, even if falls below Ts 2, the second sensor element lb again in the paramagnetic state.
  • the detection position can be maintained even if Tsi is exceeded and the first sensor element la changes into the ferromagnetic state ,
  • FIGS. 14a and 14b A further embodiment is shown in FIGS. 14a and 14b, in which case the desired functionality can be shown instead of that shown in FIGS. 13a and 13b Tilting mechanism also based on a purely translational movement, which allows a particularly flat design of the sensor.
  • a base body 10 On a base body 10, two permanent magnets Ml, M2 are attached. The region between the permanent magnets Ml and M2 serves as a sliding surface for a carrier 11. At one end of the carrier 11, the side facing the first permanent magnet Ml, a first permanent-ferromagnetic material piece Fl and the first sensor element la are attached. At the other end of the carrier 11, the second permanent magnet M2 side facing, is also a second permanent ferromagnetic piece of material F2 and a second sensor element lb. In the course of the sensor production - both sensor elements are ferromagnetic - the carrier 11 is positioned in the starting position (FIG. 14a).
  • this starting position remains stable as long as the force generated by the first permanent magnet M1, the first permanent ferromagnetic material piece F1 and the first sensor element 1a is greater than that by the second permanent magnet M2, the second permanent ferromagnetic material piece F1 and second sensor element lb generated force.
  • the force ratios are adjustable by the choice and position of the permanent magnets Ml, M2, or the permeabilities of the sensor materials of the sensor elements la, lb and the permanent ferromagnetic materials Fl, F2, and their position along the carrier 11. In this initial position, the sensor can be mounted on the refrigerated goods even at temperatures> Tsi.
  • the second sensor element 1b loses its ferromagnetic properties, and immediately afterwards also the first sensor element 1b (see FIG.
  • the carrier 11 is then held in its position corresponding to the initial position exclusively by the resulting force exerted by the first permanent magnet M1 on the first permanent ferromagnetic material piece F1. If the threshold temperature Ts 2 is exceeded in this activated state, the second sensor element 1b becomes ferromagnetic and the force relationships change as a result of the magnetic force of the second permanent magnet now becoming effective With suitable dimensioning, a resultant force is produced which pulls the carrier 11 in the direction of the second permanent magnet M2 into a detection position until it stops (FIG. 14b) Fl, F2 this position of the carrier 11 is stably maintained, even if falls below Ts 2, the second sensor element lb again in the paramagnetic state.
  • the detection position are maintained even when Tsi is exceeded and the first sensor element la changes to the ferromagnetic state.
  • a temperature monitor for falling below a predetermined threshold temperature can be realized.
  • Gd5 (Sil-xGex) 4 Ni-Mn, Ni-Mn-Ga, Ni-Mn-In (Co), La-Fe-Si, La -Fe-Si-Co, La-Fe-Si-Co-B,

Landscapes

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

Abstract

L'invention concerne un capteur servant à détecter un dépassement unique et temporaire d'une température seuil TS, comprenant au moins un élément de détection (1) muni d'un matériau de détection composé d'un alliage magnétocalorique. Lors du dépassement de la température seuil TS, le matériau de détection de l'élément de détection (1) passe d'un premier état à un deuxième état, et présente une susceptibilité magnétique différente dans le premier état et dans le deuxième état. Une unité de détection (5) permet de détecter directement ou indirectement le passage du matériau de détection de l'élément de détection (1) du premier état au deuxième état.
PCT/AT2015/050011 2014-02-03 2015-01-14 Capteur servant à détecter un dépassement unique et temporaire d'une température seuil WO2015113086A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15705894.2A EP3063516A1 (fr) 2014-02-03 2015-01-14 Capteur servant à détecter un dépassement unique et temporaire d'une température seuil

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50078/2014A AT515326B1 (de) 2014-02-03 2014-02-03 Sensor zur Detektion des einmaligen temporären Überschreitens einer Schwelltemperatur
ATA50078/2014 2014-02-03

Publications (1)

Publication Number Publication Date
WO2015113086A1 true WO2015113086A1 (fr) 2015-08-06

Family

ID=52573991

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AT2015/050011 WO2015113086A1 (fr) 2014-02-03 2015-01-14 Capteur servant à détecter un dépassement unique et temporaire d'une température seuil

Country Status (3)

Country Link
EP (1) EP3063516A1 (fr)
AT (1) AT515326B1 (fr)
WO (1) WO2015113086A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018127357A1 (fr) * 2017-01-09 2018-07-12 Endress+Hauser Wetzer Gmbh+Co. Kg Transmetteur de valeur limite de température
US10095972B2 (en) 2016-03-01 2018-10-09 Temptime Corporation Switchable RFID antennas responsive to an environmental sensor
US10318781B2 (en) 2015-03-30 2019-06-11 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
US10546172B2 (en) 2015-03-30 2020-01-28 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
CN112027358A (zh) * 2020-07-14 2020-12-04 浙江大工新能源有限公司 一种用于冷链物流的便携式保温箱无线温度监控装置
US11734539B2 (en) 2021-04-05 2023-08-22 Temptime Corporation Dynamic optical property windows in indicia with sensors
US11856720B2 (en) 2020-10-09 2023-12-26 Apple Inc. Accessory devices that communicate with electronic devices
US11913845B2 (en) 2021-02-25 2024-02-27 Temptime Corporation Tunable capacitance-based temperature sensor
US12020097B1 (en) 2023-01-31 2024-06-25 Temptime Corporation 2D bar code using active overlays

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1309906A (en) * 1969-06-09 1973-03-14 English Electric Co Ltd Temperature sensors
US5201583A (en) * 1989-08-17 1993-04-13 British Technology Group Limited Temperature history indicator
US20060152313A1 (en) * 2003-03-17 2006-07-13 Mems-Id Pty Ltd. Temperature sensing devices, systems and methods
JP2006208144A (ja) * 2005-01-27 2006-08-10 Dainippon Printing Co Ltd 記憶型センサ付非接触ｉｃタグおよび環境保障方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1309906A (en) * 1969-06-09 1973-03-14 English Electric Co Ltd Temperature sensors
US5201583A (en) * 1989-08-17 1993-04-13 British Technology Group Limited Temperature history indicator
US20060152313A1 (en) * 2003-03-17 2006-07-13 Mems-Id Pty Ltd. Temperature sensing devices, systems and methods
JP2006208144A (ja) * 2005-01-27 2006-08-10 Dainippon Printing Co Ltd 記憶型センサ付非接触ｉｃタグおよび環境保障方法

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10318781B2 (en) 2015-03-30 2019-06-11 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
US10546172B2 (en) 2015-03-30 2020-01-28 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
US11182579B2 (en) 2015-03-30 2021-11-23 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
US11455483B2 (en) 2015-03-30 2022-09-27 Temptime Corporation Two dimensional barcode with dynamic environmental data system, method, and apparatus
US10095972B2 (en) 2016-03-01 2018-10-09 Temptime Corporation Switchable RFID antennas responsive to an environmental sensor
US10628726B2 (en) 2016-03-01 2020-04-21 Temptime Corporation Switchable RFID antennas responsive to an environmental sensor
WO2018127357A1 (fr) * 2017-01-09 2018-07-12 Endress+Hauser Wetzer Gmbh+Co. Kg Transmetteur de valeur limite de température
CN112027358A (zh) * 2020-07-14 2020-12-04 浙江大工新能源有限公司 一种用于冷链物流的便携式保温箱无线温度监控装置
US11856720B2 (en) 2020-10-09 2023-12-26 Apple Inc. Accessory devices that communicate with electronic devices
US11913845B2 (en) 2021-02-25 2024-02-27 Temptime Corporation Tunable capacitance-based temperature sensor
US11734539B2 (en) 2021-04-05 2023-08-22 Temptime Corporation Dynamic optical property windows in indicia with sensors
US12020097B1 (en) 2023-01-31 2024-06-25 Temptime Corporation 2D bar code using active overlays

Also Published As

Publication number Publication date
EP3063516A1 (fr) 2016-09-07
AT515326B1 (de) 2016-04-15
AT515326A1 (de) 2015-08-15

Similar Documents

Publication Publication Date Title
AT515326B1 (de) Sensor zur Detektion des einmaligen temporären Überschreitens einer Schwelltemperatur
DE60131657T2 (de) Drahtloses kommunikationsgerät und verfahren
DE3413839C2 (de) Markierungseinrichtung für ein Überwachungssystem
EP1484816A4 (fr) Antenne pour unite de lecture/ecriture et unite de lecture/ecriture presentant une telle antenne
WO2006045274A1 (fr) Systeme transpondeur
EP1456906B1 (fr) Emetteur-recepteur a noyau magnetique pour la detection de marqueurs electroniques de surveillance d'articles
EP0732011A1 (fr) Procede et dispositif de demande d'informations sans fil
EP2597440B1 (fr) Capteur de température passif
WO2007097811A3 (fr) Bande de connexion de condensateur
WO2008061800A1 (fr) Antenne pour un transpondeur rfid basé sur une rétrodiffusion
US8432164B2 (en) Ferromagnetic resonance and memory effect in magnetic composite materials
WO2018127357A1 (fr) Transmetteur de valeur limite de température
EP1902411B1 (fr) Ensemble circuit d'accumulation d'energie destine a etre utilise dans des transpondeurs rf et procede de commande d'un certain nombre de transpondeurs de ce type
EP2957880B1 (fr) Arrangement de corps elastiques elementaires pour des capteurs de couple ou de force
DE102007058278A1 (de) Sicherheitsgurtsystem
KR20050063706A (ko) Ｅａｓ 및 ｒｆｉｄ 애플리케이션들을 위한 나노결정질코어 안테나
WO2014001225A1 (fr) Surveillance d'état par transpondeur rfid
JP2005006263A (ja) 磁芯部材及びそれを用いたｒｆｉｄ用アンテナ
EP2738715B1 (fr) Tube Tag
EP1814068A1 (fr) Antenne pour un transpondeur RFID basé sur une rétrodiffusion
DE102005049924B4 (de) Transpondersystem
DE10160452C2 (de) Codeträgervorrichtung
WO2008031629A1 (fr) Microantenne pour communication en champ proche
AT516195B1 (de) Passiver drahtloser RFID Temperatur Indikator
DE102013203663A1 (de) Zustandsüberwachung mit RFID

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15705894

Country of ref document: EP

Kind code of ref document: A1

DPE1 Request for preliminary examination filed after expiration of 19th month from priority date (pct application filed from 20040101)
REEP Request for entry into the european phase

Ref document number: 2015705894

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2015705894

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE