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WO2008127192A1 - Transpondeur actif-passif - Google Patents

Transpondeur actif-passif Download PDF

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Publication number
WO2008127192A1
WO2008127192A1 PCT/SE2008/050425 SE2008050425W WO2008127192A1 WO 2008127192 A1 WO2008127192 A1 WO 2008127192A1 SE 2008050425 W SE2008050425 W SE 2008050425W WO 2008127192 A1 WO2008127192 A1 WO 2008127192A1
Authority
WO
WIPO (PCT)
Prior art keywords
transponder
product
tag
active
passive
Prior art date
Application number
PCT/SE2008/050425
Other languages
English (en)
Inventor
Richard UUSIJÄRVI
Original Assignee
Sp Sveriges Tekniska Forskningsinstitut Ab
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 Sp Sveriges Tekniska Forskningsinstitut Ab filed Critical Sp Sveriges Tekniska Forskningsinstitut Ab
Priority to EP08741915A priority Critical patent/EP2137556A1/fr
Publication of WO2008127192A1 publication Critical patent/WO2008127192A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/46—Wood
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V15/00—Tags attached to, or associated with, an object, in order to enable detection of the object

Definitions

  • the present invention concerns a transponder or tag to be used in identifying and tracking biological products or materials, such as wood, domestic animals, meat.
  • Radio-frequency identification is an automatic identification method, relying on storing and remotely retrieving data using devices called RFID tags or transponders.
  • An RFID tag or transponder is an object that can be attached to or incorporated into a product, animal, or person for the purpose of identification using radio waves.
  • Chip-based RFID tags contain RFID-chips and antennas.
  • Transponder apparatus and system of a general type comprises a base station or reader that transmits an "interrogation" signal to a remote transponder, the transponder responding with an "answerback" transmission.
  • the transponder includes a changeable or writable memory, and means responsive to the transmitted interrogation signal for processing the signal and for selectively writing data into or reading data out from the memory.
  • the transponder then transmits an answerback signal from the data read-out from its internal memory, which signal may be interpreted at the base station.
  • tags There are two types of tags. One type is a passive transponder which requires no internal power source and generates its own operating power from the transmitted interrogation signal. The other type is an active transponder which requires a power source.
  • passive RFID tags have no internal power supply.
  • the minute electrical current induced in the antenna by the incoming radio frequency signal provides just enough power for the integrated circuit in the tag to power up and transmit a response This means that the antenna has to be designed to both collect power from the incoming signal and also to transmit the outbound backscatter signal.
  • the lack of an onboard power supply in the passive tag means that the device can be quite small: commercially available products exist that can be embedded in a sticker, or under the skin in the case of low frequency RFID tags.
  • the ongoing problem with all RFIDs is that they need an external antenna which is much bigger than the chip.
  • active RFID tags Unlike passive RFID tags, active RFID tags have their own internal power source which is used to power any integrated circuits that generate the outgoing signal. Active tags are typically much more reliable (e.g. fewer errors) than passive tags due to the ability for active tags to conduct a "session" with a reader. Active tags, due to their onboard power supply, also transmit at higher power levels than passive tags, allowing them to be more effective in "RF challenged” environments like water, metal, or at longer distances. The drawback is that they are more expensive and generally larger than the passive tags.
  • One object of the invention is to achieve a small, cheap transponder that can be used on or in moisture containing materials.
  • Another object is to achieve a transponder that can be used on or in a biological material or product and can be read both when the material or product is fresh and humid and when it is dry.
  • a further object is to achieve a transponder that can be used to mark timber and can be read both when the timber is fresh and humid and when the timber is dry.
  • Still another object is to achieve a means whereby it is possible to judge when a biological material such as wood or meat is fresh and when it is old.
  • a high frequency or ultra high frequency transponder or tag in the following called HF tag or transponder, which contains an antenna and a data chip inside a housing and which according to the invention comprises two electrodes connected to the said data chip and which will form an electrolytic cell when the tag is attached to a moist or wet material, the electrolyte of the cell being the moisture in or on the material.
  • the transponder of the invention comprises a chip, an antenna and two electrodes arranged so as to form an electric circuit with the moisture in the wet material.
  • the electrodes are connected to each other inside the hosing in such a way as to be able to power the data chip.
  • the transponder will work as an active transponder when the material is fresh and has a high moisture content and work as a passive transponder when the material grows older and dries.
  • the available electrolyte As the current is transported through the available electrolyte it may also be used as an indicator of the age and dryness of the material to which the tag is attached. When the material reaches a certain low moisture level, no current can be detected.
  • Fig 1 shows a schematic drawing of a possible passive high frequency transponder.
  • Fig 2 is a diagram showing current, voltage and effect obtained from two electrodes inserted into wood.
  • tags to mark wood, such as a substantial part of all logs felled in the EU, it is necessary that the price of the tag is very low, below about 1 € per tag. Also, the tag applicator to be attached to a harvester head must be loaded with a substantial number of tags to avoid frequent reloading.
  • the tag must be small so that many tags may be loaded in the applicator. Smallness also contributes to a low price.
  • the low frequency tags tried for marking wood have a length of 23 mm and comprise an antenna spool, a data chip and a capacitor in a glass cover.
  • the contemplated passive high frequency tag in the form of a nail shown on Fig 1 has a length of 95 mm and a diameter of 5 mm. It is envisaged that a tag to be used for marking logs or wood in general should at the very most have a size of the order of 20 x 3 mm. Thus, such a tag would have 1/5 of the length of the nail in Fig 1 and also have only about half of the nails diameter.
  • Such a small active/passive tag is possible to produce, apply and read in accordance with the present invention.
  • the electrodes consisting of two different metals, can be attached to the outside of the tag, one on each side, for instance, and connected over the data chip to provide this with power when needed. It is also possible to arrange a switching device, such as a transistor, which disconnects the electrodes when no power is needed.
  • Wood is generally considered an isolator. However, fresh wood having a relatively high moisture content has electrolytic properties. This is shown in the following examples.
  • Electrodes of copper and zink galvanised nail were driven into a fresh wood sample cut from storm felled pine. A volt ammeter was connected to the electrodes. The measured electric tension was 0.8 V and the current 9.4 ⁇ A. Thus, a power of 7.5 ⁇ W was obtained.
  • Electrodes of copper and zink were driven into different kinds of logs. Some were stored in the open and some in the laboratory. Current, tension and power were measured intermittently during a test period of 50 days. The results are shown on Fig 2. The figure also shows the temperature of the outdoor logs.
  • Fig 2 TL is pine in laboratory
  • GL is spruce in laboratory
  • TU is pine outdoors
  • GU is spruce outdoors
  • Temp is the outdoor temperature.
  • test results from examples 1 and 2 show clearly that it is possible to use moisture in a biological material as electrolyte in an electrolytic cell.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geophysics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

L'invention concerne un transpondeur HF ou UHF à utiliser sur un matériau/produit biologique ou dans un matériau/produit biologique, qui comprend une puce de données et une antenne dans un boîtier, et deux électrodes connectées à ladite puce de données à l'intérieur du boîtier et agencées de telle manière sur l'extérieur du logement à pouvoir former un circuit fermé avec de l'humidité possible dans le matériau/produit, après la fixation au matériau/produit biologique. Un procédé de détermination de la teneur en humidité dans le matériau/produit biologique, comportant l'utilisation d'un transpondeur HF ou UHF selon l'invention et la mesure d'un paramètre électrique dans le circuit fermé dans le transpondeur est également proposé.
PCT/SE2008/050425 2007-04-16 2008-04-15 Transpondeur actif-passif WO2008127192A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08741915A EP2137556A1 (fr) 2007-04-16 2008-04-15 Transpondeur actif-passif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0700938-4 2007-04-16
SE0700938 2007-04-16

Publications (1)

Publication Number Publication Date
WO2008127192A1 true WO2008127192A1 (fr) 2008-10-23

Family

ID=39864179

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/050425 WO2008127192A1 (fr) 2007-04-16 2008-04-15 Transpondeur actif-passif

Country Status (2)

Country Link
EP (1) EP2137556A1 (fr)
WO (1) WO2008127192A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010052375A1 (fr) * 2008-11-10 2010-05-14 Skandinavian Kalvontekijät Oy Partie corps de dispositif rfid montable par clouage ou clou rfid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10011636A1 (de) * 2000-03-10 2001-09-27 Siemens Ag Vorrichtung zur Feuchtemessung
WO2001097597A1 (fr) * 2000-06-19 2001-12-27 Maria Kawalec Element de marquage pour estamper du bois
US20020170213A1 (en) * 2001-03-28 2002-11-21 Latschbacher Gmbh Marking element for marking timber, especially tree trunks
WO2005103661A1 (fr) * 2004-04-22 2005-11-03 Damsten Leif Daniel Procede et appareil permettant de mesurer la teneur en humidite d'un bloc de bois de sciage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10011636A1 (de) * 2000-03-10 2001-09-27 Siemens Ag Vorrichtung zur Feuchtemessung
WO2001097597A1 (fr) * 2000-06-19 2001-12-27 Maria Kawalec Element de marquage pour estamper du bois
US20020170213A1 (en) * 2001-03-28 2002-11-21 Latschbacher Gmbh Marking element for marking timber, especially tree trunks
WO2005103661A1 (fr) * 2004-04-22 2005-11-03 Damsten Leif Daniel Procede et appareil permettant de mesurer la teneur en humidite d'un bloc de bois de sciage

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010052375A1 (fr) * 2008-11-10 2010-05-14 Skandinavian Kalvontekijät Oy Partie corps de dispositif rfid montable par clouage ou clou rfid

Also Published As

Publication number Publication date
EP2137556A1 (fr) 2009-12-30

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