SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors
AbstractOne-port surface acoustic wave (SAW) devices with defined reflector patterns give characteristic signal patterns in the time domain making them identifiable and leading to so-called RFID-Tags. Each sensor responds with a burst of signals, their timed positions giving the identification code, while the amplitudes can be related to the analyte concentration. This paper presents the first combination of such a transducer with chemically sensitive layer materials. These include crosslinked polyvinyl alcohol for determining relative humidity and tert-butylcalixarene for detecting solvent vapors coated on the free space between the reflectors. In going from the time domain to the frequency domain by Fourier transformation, changes in frequency and phase lead to sensor responses. Hence, it is possible to measure the concentration of tetrachloroethene in air down to 50 ppm, as well as 1% changes in relative humidity. View Full-Text
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Lieberzeit, P.A.; Palfinger, C.; Dickert, F.L.; Fischerauer, G. SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors. Sensors 2009, 9, 9805-9815.
Lieberzeit PA, Palfinger C, Dickert FL, Fischerauer G. SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors. Sensors. 2009; 9(12):9805-9815.Chicago/Turabian Style
Lieberzeit, Peter A.; Palfinger, Christian; Dickert, Franz L.; Fischerauer, Gerhard. 2009. "SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors." Sensors 9, no. 12: 9805-9815.