| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Research Abstract |
We have studied a novel SAW gas sensor for odors from patients or in sickrooms and hydrogen-gas leakage from future fuel-cell cars. The developed sensor will be installed in sensor network. The use in a garage as sensor nodes must guarantee large temperature range from -40 to 80 °C, which requires the self-temperature-compensation characteristics as an essential feature. Moreover, the sensor nodes must operate over couples of years under a single battery, which requires very low-power consumption and very low-loss characteristics for SAW sensors. In this study
(1) we achieved the self-temperature-compensation characteristics which removed the limitation for piezoelectric crystal substrates such as a Quartz substrate;
(2) we developed a new lattice-circuit type low-loss sensor consisting of SAW resonators which could make it possible to be included in sensor nodes;
(3) in order to increase the sensing sensitivity we proposed a double-reflection type SAW resonators which had effectively expanded the interaction areas reactive to sensing gas. Experimental and simulation results are presented.
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