ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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 by exploiting this approach. © 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.121895
