Versatile resonance-tracking circuit for acoustic levitation experiments
- 1 February 1978
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 49 (2) , 224-226
- https://doi.org/10.1063/1.1135371
Abstract
Objects can be levitated by radiation pressure forces in an acoustic standing wave. In many circumstances it is important that the standing wave frequency remain locked on an acoustic resonance despite small changes in the resonance frequency. A self-locking oscillator circuit is described which tracks the resonance frequency by sensing the magnitude of the transducer current. The tracking principle could be applied to other resonant systems.Keywords
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