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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Wen Wang Shitang He Shunzhou Li Yong Pan |
| Copyright Year | 2006 |
| Description | Author affiliation: Chinese Acad. of Sci., Beijing (Wen Wang; Shitang He; Shunzhou Li) |
| Abstract | This paper presents a 158 MHz surface acoustic wave (SAW) gas sensor based on a novel SAW oscillator. As the oscillator element, a SAW delay line on ST-X quartz substrate with low insertion loss (less than 8 dB) and single mode selection capability was developed. Low insertion loss is implemented by electrode width control single phase unidirectional transducer (EWC/SPUDT) configuration. Single mode selection can be simply accomplished by comb transducer which is means of combination of frequency selectivity of two interdigital transducers (IDTs). Coupling of modes (COM) modeling is performed to predict device performance prior to fabrication. The measured frequency response $S_{12}$ matched well with simulated results. The experimental results show that the baseline noise of the fabricated oscillators was typically up to ~0.7 times $10^{-7}$ in a laboratory environment with cooling step. The oscillator was successfully applied to gas sensor coated self-assembled composite monolayer as sensor material for dimethyl-methyl-phosphonate (DMMP), The sensitivity for low DMMP concentrations detection was evaluated as ~25 $Hz/mg/m^{3},$ and the threshold detection limit was up to 0.5 $mg/m^{3}.$ |
| Starting Page | 675 |
| Ending Page | 678 |
| File Size | 1059465 |
| Page Count | 4 |
| File Format | |
| ISBN | 1424403758 |
| ISSN | 19300395 |
| DOI | 10.1109/ICSENS.2007.355562 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2006-10-22 |
| Publisher Place | South Korea |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Surface acoustic waves Gas detectors Frequency Stability Oscillators Insertion loss Transducers Acoustic waves Delay lines Electrodes |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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