An acoustic bubble density measurement technique for surface ship waters

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 wakes. The dual frequency technique of acoustically detecting bubbles utilizes a high and low frequency sound field to insonify the target bubbles. The bubbles themselves then radiate sound at the sidebands of higher frequency. The frequency of the return sound is proportional to the bubble sizes present. The Dual Frequency Pump Method of bubble detection can differentiate and count many different sized bubbles and is, therefore, well suited for determining ship wake bubble density distributions. The theory, considerations, experimental results, and recommendations of this thesis support the application of the dual frequency acoustic techniques to the ship wake problem. Keywords: Theses; Acoustic bubble density measurement; Surface ship wakes; Bubble resonance; Dual frequency bubble detection; Ultrasonic bubble detection

Department dc:contributor.department

Physics (PH)

Grantor dc:publisher

Monterey, CA; Naval Postgraduate School

Year dc:date.issued

1987

Author dc:creator

• Hampton, Stephen Wallace

Advisor dc:contributor.advisor

• Atchley, Anthony

Statement dc:rights

• This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.

Handle dc:identifier.uri

https://hdl.handle.net/10945/22590

OAI identifier oai:identifier

oai:calhoun.nps.edu:10945/22590