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21 February 2002 Wireless passive resonant-circuit sensors for monitoring food quality
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The inductor-capacitor (LC) sensor, comprised of a thick- film printed LC resonant circuit the resonant frequency of which can be remotely detected with a loop antenna, has been used for the monitoring of temperature, humidity, atmospheric pressure, salt concentration, and complex permittivity, as well as the detection of bacteria in a liquid medium based upon changes in the complex permittivity due to the bacteria growth. Due to its low unit cost and wireless detection, the LC sensor is potentially suitable for commercial scale monitoring of food quality. This paper includes the operational principles and design criteria of the LC sensor, and illustrates the monitoring of bacteria growth in milk, meat, and beer.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Keat Ghee Ong, Libby G. Puckett, Bethel V. Sharma, Melanie Loiselle, Craig A. Grimes, and Leonidas G. Bachas "Wireless passive resonant-circuit sensors for monitoring food quality", Proc. SPIE 4575, Chemical and Biological Early Warning Monitoring for Water, Food, and Ground, (21 February 2002);

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