| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface acoustic wave element capable of circling a plurality of surface acoustic waves many times at the same time using one circulating passage and capable of accurately and precisely measuring the deceleration of the propagation speed, phase delay or intensity reducing degree of the surface acoustic waves accompanying an increase in the circulating number of times of a plurality of the surface acoustic waves. SOLUTION: The surface acoustic wave element 10 is equipped with a substrate 14 formed of a surface acoustic wave excitable crystal material and containing at least one annular circulating passage 14a capable of circulating the excited surface acoustic waves and a surface elastic wave exciting and detecting means 16 for exciting the surface acoustic waves to circulate the same to the circulating passage and detecting the circulated surface acoustic waves. This circulating passage includes one main circulating locus 20 capable of circulating the excited surface acoustic waves along the same locus at every round and at least one sub-circulating locus 22 allowing the excited surface acoustic waves to circulate along mutually different loci below a predetermined circulating number of times and coinciding with the first circulating locus in a predetermined circulating number of times. The exciting and detecting means excites the surface acoustic waves in the sub-circulating locus to detect the same circulated along the sub-circulating locus. COPYRIGHT: (C)2010,JPO&INPIT
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