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  • Michael Freund
  • Sharmistha Bhadra
  • Gregory Bridges
  • Douglas Thomson



Project TitlePrinted pH Gas Sensor
Track Code80.02.0814
Short Description

Near-field passive volatile detection sensor


Researchers at the University of Manitoba have developed a near-field passive sensor capable of detecting acidic and basic volatiles in the surrounding environment. The sensor is a LC resonant circuit consisting of a spiral inductor connected in parallel with a voltage dependent capacitor (varactor). The volatile detector, comprised of a hydrogel coated pair of pH-sensitive electrodes is connected in parallel with the varactor. The hydrogel is used as an absorptive medium for the volatiles and acts to contain the electrolyte. Due to the absorption of the acidic and basic volatiles, the hydrogel pH changes which in turn changes the voltage across the pH-sensitive electrode pair shifting the resonant frequency of the sensor. An interrogator coil is inductively coupled to the sensor inductor and remotely tracks the resonant frequency of the sensor.

Tagsfood science, chemistry, environmental
Posted DateMay 4, 2016 11:36 AM


Michael Freund
Sharmistha Bhadra
Gregory Bridges
Douglas Thomson


Robert Werbowesky

One page summary


Robert Werbowsky

Technology Manager

Ph: +1(204)474.7865



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