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Proceedings Paper

Non-electrical-power temperature-time integrating sensor for RFID based on microfluidics
Author(s): Mike Schneider; Martin Hoffmann
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Paper Abstract

The integration of RFID tags into packages offers the opportunity to combine logistic advantages of the technology with monitoring different parameters from inside the package at the same time. An essential demand for enhanced product safety especially in pharmacy or food industry is the monitoring of the time-temperature-integral. Thus, completely passive time-temperature-integrators (TTI) requiring no battery, microprocessor nor data logging devices are developed. TTI representing the sterilization process inside an autoclave system is a demanding challenge: a temperature of at least 120 °C have to be maintained over 45 minutes to assure that no unwanted organism remains. Due to increased temperature, the viscosity of a fluid changes and thus the speed of the fluid inside the channel increases. The filled length of the channel represents the time temperature integral affecting the system. Measurements as well as simulations allow drawing conclusions about the influence of the geometrical parameters of the system and provide the possibility of adaptation. Thus a completely passive sensor element for monitoring an integral parameter with waiving of external electrical power supply and data processing technology is demonstrated. Furthermore, it is shown how to adjust the specific TTI parameters of the sensor to different applications and needs by modifying the geometrical parameters of the system.

Paper Details

Date Published: 5 May 2011
PDF: 6 pages
Proc. SPIE 8066, Smart Sensors, Actuators, and MEMS V, 80661V (5 May 2011); doi: 10.1117/12.886768
Show Author Affiliations
Mike Schneider, Ilmenau Univ. of Technology (Germany)
Martin Hoffmann, Ilmenau Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 8066:
Smart Sensors, Actuators, and MEMS V
Ulrich Schmid; José Luis Sánchez-Rojas; Monika Leester-Schaedel, Editor(s)

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