SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors
One-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 t...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2009-12-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/9/12/9805/ |
| _version_ | 1828117966836727808 |
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| author | Gerhard Fischerauer Franz L. Dickert Peter A. Lieberzeit Christian Palfinger |
| author_facet | Gerhard Fischerauer Franz L. Dickert Peter A. Lieberzeit Christian Palfinger |
| author_sort | Gerhard Fischerauer |
| collection | DOAJ |
| description | One-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-butylcalix[4]arene 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. |
| first_indexed | 2024-04-11T13:24:04Z |
| format | Article |
| id | doaj.art-eda5b3a4908b432d815f67661201bb14 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T13:24:04Z |
| publishDate | 2009-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-eda5b3a4908b432d815f67661201bb142022-12-22T04:22:07ZengMDPI AGSensors1424-82202009-12-019129805981510.3390/s91209805SAW RFID-Tags for Mass-Sensitive Detection of Humidity and VaporsGerhard FischerauerFranz L. DickertPeter A. LieberzeitChristian PalfingerOne-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-butylcalix[4]arene 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.http://www.mdpi.com/1424-8220/9/12/9805/SAWRFID-Tagcalix[n]arenehumidityVOC sensing |
| spellingShingle | Gerhard Fischerauer Franz L. Dickert Peter A. Lieberzeit Christian Palfinger SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors Sensors SAW RFID-Tag calix[n]arene humidity VOC sensing |
| title | SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors |
| title_full | SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors |
| title_fullStr | SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors |
| title_full_unstemmed | SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors |
| title_short | SAW RFID-Tags for Mass-Sensitive Detection of Humidity and Vapors |
| title_sort | saw rfid tags for mass sensitive detection of humidity and vapors |
| topic | SAW RFID-Tag calix[n]arene humidity VOC sensing |
| url | http://www.mdpi.com/1424-8220/9/12/9805/ |
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