Acoustical Science and Technology | |
Principle and application of ball surface acoustic wave (SAW) sensor | |
Kazushi Yamanaka4  Takeshi Fukiura1  Noritaka Nakaso3  Dongyoun Sim2  | |
[1] Yamatake Co.;Ball Semiconductor Inc.;Toppan Printing Co.;Tohoku University | |
关键词: Surface acoustic wave; Bearing ball; Gas sensor; Hydrogen; Naturally collimated beam; Multiple roundtrip; | |
DOI : 10.1250/ast.30.2 | |
学科分类:声学和超声波 | |
来源: Acoustical Society of Japan | |
【 摘 要 】
References(17)Cited-By(8)Detection of hydrogen gas is a crucial task for establishing safety and reliability of fuel cells, a key technology for the environment and our society. However, hydrogen is difficult to detect and various hydrogen sensors have many drawbacks. Here we report a novel hydrogen gas sensor, the ball surface acoustic wave (SAW) sensor, using Pd or PdNi sensitive film. The ball SAW sensor is based on a novel phenomenon, diffraction-free propagation of collimated beam along an equator of sphere. The resultant ultra-multiple roundtrips of SAW makes it possible to achieve highest sensitivity among SAW sensors. Moreover, it enables to use a very thin sensitive film, and consequently the shortest response time (2 s) was realized. In terms of the sensing range, it has the widest range of 10 ppm to 100% among any hydrogen sensors including FET or resistivity sensors. The response time was less than 1 s for 3.0% hydrogen concentration in nitrogen gas, evaluated by using a newly developed digital quadrature detector.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912080715685ZK.pdf | 206KB | download |