Bubble detection using a dual frequency sound field
Lineberger, Ernest R. III
Atchley, Anthony A.
MetadataShow full item record
The design, testing and analysis of a dual frequency system to detect and determine the resonance frequency (and hence the size) of bubbles ranging from 100 to 7 μm radius is reported. The resonance frequencies were compared to estimates based on the rise time of the bubbles. In general these comparisons agreed to within five percent. Although the system is not ideal for field measurements, it identifies important requirements concerning the size of the sample volume, the frequency and amplitude ranges of the sound fields and signal processing techniques to make an effective system. Bubbles are distinguished from non-gaseous particles by the nature of their nonlinear response to the dual sound field. The system is versatile and can be modified to suit many research purposes.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Evaluation of a standing wave system for determining the presence and acoustic effect of microbubbles near the sea surface. Keller, Douglas George (Monterey, California ; Naval Postgraduate School, 1968-06);That bubbles affect sound propagation in the ocean has long been known. However,, quantitative data on the concentrations and distribution of bubbles near the surface of the ocean is not available. A one-dimensional, high ...
Hampton, Stephen Wallace (1987-09);The Dual Frequency Pump Method of acoustically determining point by point bubble cloud densities was studied to determine the practicality of using this acoustic technique to determine bubble densities in surface ship ...
Snyder, David Eugene (Monterey, California: Naval Postgraduate School, 1990-12);(U) Drop diameters from 2.7 mm to 4.6 mm are common in heavy rainfall. The impact and bubble signals of the underwater sound radiation from these large drops at their terminal velocities have been identified. At a 1 MHz ...