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Proceedings Paper

Wireless passive resonant-circuit sensors for monitoring food quality
Author(s): Keat Ghee Ong; Libby G. Puckett; Bethel V. Sharma; Melanie Loiselle; Craig A. Grimes; Leonidas G. Bachas
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Paper Abstract

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.

Paper Details

Date Published: 21 February 2002
PDF: 10 pages
Proc. SPIE 4575, Chemical and Biological Early Warning Monitoring for Water, Food, and Ground, (21 February 2002); doi: 10.1117/12.456918
Show Author Affiliations
Keat Ghee Ong, The Pennsylvania State Univ. (United States)
Libby G. Puckett, Univ. of Kentucky (United States)
Bethel V. Sharma, Univ. of Kentucky (United States)
Melanie Loiselle, Univ. of Kentucky (United States)
Craig A. Grimes, The Pennsylvania State Univ. (United States)
Leonidas G. Bachas, Univ. of Kentucky (United States)

Published in SPIE Proceedings Vol. 4575:
Chemical and Biological Early Warning Monitoring for Water, Food, and Ground
Janet L. Jensen; Larry W. Burggraf, Editor(s)

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