Not only identification. UHF-RFID in the Food Chain - From Identification to Smart Labels

Transcription

1 Food is different UHF-RFID in the Food Chain - From Identification to Smart Labels Coldchain Manangement. 3rd International Workshop,.-3. June 8, Bonn Not only identification Temperature data Quality data Write back data to tag during transshipment (changed quality, max temp.) Low cost RFID sensors might enable temperature tracking per pallet / item Reiner Jedermann, University Bremen, IMSAS / Example for spatial temperature deviations UHF in the food chain Application of HF-Loggers Local deviation of up to 9 C in delivery truck Deep freezer after 6 hours cool down Slow 5 sec. per logger Max. dist. cm Benefits of UHF RFID Reading range up to 3 meters Gen- protocol offers highest data rate Limits of UHF-RFID More sensitive against water containing goods Fast enough for large temperature histories? Intelligent RFID / Smart (active) labels On-chip processing of temperature data Update intelligent container 3 4

2 Test setting: Tags inside freight 6 Boxes with bottles ( l water) Distance m Movement of freight Reader antenna UHF Gen- Tags NXP Ryparian 5 Identification rate as function of reader output power mw for front tags 4 mw / 9 mw for st row Only 5% rate reached for nd row Sirit slightly better Identification Rate % front row st row nd row 3rd row Reader Power Sirit Infinity (solid line) Feig (dotted) 6 Write rate Data transfer speed: Read 4 mw for writing front tags For st row only 5% reached front Reading 8 Bytes of user Amplitude modulation recorded by spectral analyzer Setting: Tari ms Symbol rate 8 KBit/sec Feig Reader H = Handle EPC = Electronic Product Code Conclusions UHF has a low penetration into moisture containing goods Access only to tags at surface Write Rate % st row nd + 3rd row Reader Power Power-up ms + 6 ms Deselect Select EPC Query H Acknowledge EPC H Request New handle Read User Data 4 ms Protocol ms 7 8

3 Prediction for UHF temperature loggers Currently only 8 or 64 byte user available UHF temperature tags announced by semiconductor manufactures Formula to calculate protocol time for reading large blocks T Read = T + (83+ 6 N ) T + (94 + N ( N + 39)) T up R Bit Time to transfer 7 temperature values = kbyte (N R =3 blocks with N B =56 bytes each) R B Sym Test with pallet wrapping machine Test at palette wrapper rpm =.6 m/sec Performance of ID and write for moving freight 75 ms per temperature logger required Optimistic maximum 5 loggers per second 9 Time window for identification and write Identification Tags are for.35 seconds visible for the reader At least 9 Identifications per tag and round Writing user Measured for 8 Bytes = 67 ms At reduced speed of 4 rpm 8% of the tags could be written Identification rate in % seconds Time offset in seconds Identification rate per tag within a time window of ± 75 ms W ERP.5W ERP Solutions for the communication bottleneck On-Chip processing of sensor data by smart label Semi-passive tag as Intelligent RFID Temperature logger + shelf life model Temperature Humidity Quality- Index 8 State: green red 6 T ( C) 3 Shelf Life (days)

4 Smart labels Is it feasible to squeeze a shelf life model into a microchip? Type of Resource Processing time Program RAM Energy Calculation of Arrhenius equations. ms 868 bytes 58 bytes 6 µjoule Integration into commercial active wireless sensor Currently no UHF hardware available Class 3 battery assisted tags supposed to be available end 8 Apply approach to active wireless sensors Smart active label New cooperation with Ambient Systems Manufacturer of wireless meshed sensor networks for logistical applications 3 4 Integration into real time remote monitoring Setting for real-time monitoring of delivery trucks Project intelligent container Transfer project since January 8 Field test will start in autumn Partnership with Eurocoldchain / FP7 planned RFID Reader Local Pre-Processing Truck Alternate networks UMTS WLAN GPRS Server T- Systems Web- Interface Freight Object (RFID) Sensor Nodes 5 External Communication Unit Gateway Cargobull Telematics Unit 6

5 Setting for sea transports Reading range of wireless sensors Satellite system notification Test in Dole warehouse / Antwerp Container with Bananas was equipped with wireless sensors Base station could only /3 of all sensors RSSI Received signal strength indicator Multi hop protocol required to access all sensor nodes Captain's bridge WLAN Gate way WSN WSN BASE The End Thanks for your attention Contact address Dipl.-Ing. Reiner Jedermann Universität Bremen, FB (IMSAS/), Otto-Hahn-Allee NW, D-8359 Bremen, GERMANY Phone , Fax rjedermann@imsas.uni-bremen.de 9