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- W2108292165 abstract "Chirped structures as sensing elements in a delay line allow for the variation of the sensitivity over a wide range. A sensor system operating at a center frequency of 434 MHz and a system bandwidth of 1.7 MHz will be shown. We designed dispersive inline SAW structures with two chirped and apodized IDTs. Two expanders, one with an up- and the other with a down-chirp, have been built on quartz 37.5/spl deg/ cut. The corresponding compressors (down- and up-chirp) are the sensor elements and have a wider bandwidth to compensate for the frequency shift due to the sensor effect. The compressors have been built on quartz for mechanical sensing and on LiNbO/sub 3/, YZ-cut for temperature sensing. To avoid bulk wave conversion we used a modulated IDT with 8 electrodes per electrical period. On quartz we operated these IDTs on the 3rd and on LiNbO/sub 3/ on the 5th harmonic which is lower than the onset frequency for bulk wave conversion and gives a suitable impedance level as well. We present theoretical and experimental results for the devices and show results of the corresponding sensor systems for temperature." @default.
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- W2108292165 date "2002-11-23" @default.
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- W2108292165 title "Chirped SAW devices for wireless passive sensors" @default.
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- W2108292165 doi "https://doi.org/10.1109/ultsym.1997.663036" @default.
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