fully passive sensor devices with rfid - project: smartpack · faculty of mechanical engineering...
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www.tu-ilmenau.de
Faculty of Mechanical Engineering
Institute of Micro- and Nanotechnologies
Department of Micromechanical Systems
98693 Ilmenau, Germany
Phone +49 3677 69-2487
www.tu-ilmenau.de/mms
Authors:
Univ.-Prof. Dr. Ing. M. Hoffmann,
M. Schneider (TU Ilmenau)
G. Menges (NXP Hamburg)
M. Werner (Alcan Packaging Singen GmbH)
Fully passive sensor devices with RFID - Project: SmartPack
New integration technology for RFID opens the path for new applications such as integrated sensors which deliver information on the status of packaged goods. As one of the most critical parameters, the temperature-over-time integral TTI) has been identified.
For supervision of cold-chain-management, a diffusion-based concept has been developed, that integrates measurement values by collecting the permeating water from the good into a storage layer (fig. 1). The change in resistance of the storage layer is directly related to the TTI information.
For high-temperature applications, such as sterilisation processes, a capillary force sensor, shown in fig. 2, has been investigated. After reaching the required temperature a molten polymer diffuses into a channel. The length of the path that the molten polymer follows depends on temperature (resulting in different viscosity) and time at increased temperature. Another approach is to monitor the change of the dielectric polymer (e.g. epoxy) due to polymerisation as shown in fig. 3.
For low-cost applications close to the customer the realisation of sensor concepts without any (electrical) energy storage or energy harvesting is essential and a first step in this direction has been opened.
funded by:
Figure 1: Sensing resistor with memory and barrier layer based on polymer
Figure 2: Meandering structure with electronic contacts TTI via capillary flow detection
change of capacity for epoxide
3,8
4
4,2
4,4
4,6
4,8
5
0 50 100 150 200time
Ca
pa
city
T=15°C
T=25°C
min
pF
Figure 3: Temperature depending change of capacity