Noncontact excitation of high Q acoustic resonances in glass plates
Noncontact excitation of high Q acoustic resonances in glass plates
复制标题
玻璃板中高 Q 声共振的非接触激发
DOI：
10.1063/1.121895
复制
发表时间：
1998
影响因子：
4
通讯作者：
C. Lowe
中科院分区：
文献类型：
--
作者：
A. Stevenson;C. Lowe
磁直接产生技术是一种非接触式的声波产生技术，但其换能器效率低，限制了其应用。这封信描述了一种通过应用转换格式，增强的直接磁产生，利用连续波谐振和薄膜产生，大大提高转换效率的方法。涂有铝薄膜的玻璃板已被用作独立的声腔，以产生具有高转换效率和Q因子的共振。这些声共振是在没有机械接触的情况下激发的，并以530 μm厚的渗铝石英板为例讨论了它们的起源和特征。磁直接产生的影响施加到薄金属膜，而不是散装金属，也进行了讨论，特别是相对于高的工作频率和声学Q因子。这是可能的，新的传感器和时间标准可能会被构建…
The applications of magnetic direct generation, a noncontact technique for generating acoustic waves, are limited by poor transduction efficiency. This letter describes an approach for substantially improving the transduction efficiency by application of a transduction format, enhanced direct magnetic generation, that utilizes continuous wave resonances and thin film generation. Glass plates coated with thin films of aluminium have been used as free-standing acoustic cavities to generate resonances with high transduction efficiencies and Q factors. These acoustic resonances have been excited without mechanical contact and their origin and characteristics are discussed with respect to resonances in 530 μm thick aluminized silica plates. The consequences of magnetic direct generation applied to thin metal films, as opposed to bulk metal, are also discussed, particularly with respect to high operating frequencies and acoustic Q factors. It is possible that novel sensors and time standards may be constructed ...