Wireless, passive, resonant-circuit sensors for monitoring food quality

Keat Ghee Ong, Libby G. Puckett, Bethel V. Sharma, Melanie Loiselle, Craig A. Grimes, Leonidas G. Bachas

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)150-159
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jan 1 2001
Externally publishedYes


  • Bacteria growth
  • Complex permittivity
  • Food quality
  • Meat
  • Milk
  • Resonant circuit
  • Sensor
  • Wireless

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Wireless, passive, resonant-circuit sensors for monitoring food quality'. Together they form a unique fingerprint.

Cite this