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A multisensor system for beer flavour monitoring using an array of conducting polymers and predictive classifiers
(1994) Gardner, Julian W; Pearce, Timothy C; Friel, Sharon; Bartlett, Philip N; Blair, Neil
This paper describes the results of a three year project, jointly funded by the UK government and industry, to develop a multisensor system capable of discriminating between the aromas of different beers. The system consists of an array of up to 24 conducting polymer sensors (thin films electrodeposited onto a microelectrode structure). The conducting polymers provide the active layer in these conductometric odour sensors and respond differentially to the headspaces of beers and lagers. The interface circuitry and signal conditioning have been designed and realized in custom PCBs housed in a Eurorack-based multisensor system. A comprehensive suite of software modules has been developed to automate the sampling system and process the sensor array data. The output from the polymer array is pre-processed using a variety of algorithms (e.g., fractional change in conductance, normalized relative response) and then classified using a statistical (chemometric fingerprinting technique) or neural predictive classifier (multi-layer perceptron using back-propagation learning). The odour-sensing system can distinguish subtle taints, e.g., 0.5 ppm of diacetyl in an ethanol solution with only nine different varieties of conducting polymers.
Wes Whitten interviewed by Stephen Foster, recorded 28 July 1992
Foster, Stephen Glynn (1948-); Speaker: Stephen Foster; Speaker: Wesley Kingston Whitten (1918-2010)
Recorded by Australian Heritage Projects for ANU Oral History Project.
Pat White interviewed by Stephen Foster, recorded June to July 1991
Foster, Stephen Glynn (1948-); Speaker: Stephen Foster; Speaker: Patricia Marie (Pat) White (1930-2013)
Recorded by Australian Heritage Projects for ANU Oral History Project. -- Interview 21. -- Tapes 1 and 2 recorded 7 June 1991, tapes 3 and 4 recorded 24 June 1991.
Wang Gungwu interviewed by Stephen Foster, recorded 22 September 1994
Foster, Stephen Glynn (1948-); Speaker: Stephen Foster; Speaker: Wang Gungwu (1930-)
Recorded by Australian Heritage Projects for ANU Oral History Project.
Oskar Spate interviewed by Daniel Connell, recorded 15 May 1990
Foster, Stephen Glynn (1948-); Speaker: Daniel Connell; Speaker: Oskar Hermann Khristian Spate (1911-2000)
Recorded by Australian Heritage Projects for ANU Oral History Project. -- Interview 4.