An acoustic bubble density measurement technique for surface ship waters
By: Stephen Wallace Stephen Wallace
Contributors: Atchley, Anthony Armstrong, 1957-
Published: 1987
Language: eng
Number of pages: 186
Subjects: Antisubmarine warfare
Description: 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.
Notes: Thesis advisor, Anthony Atchley.

Available from National Technical Information Service, Springfield, Va.

"September 1987."

Thesis (M.S. in Systems Tech.) Naval Postgraduate School, Sep. 1987.

Includes bibliographical references.

"Approved for public release; distribution is unlimited--"Cover.

Also available online.

Mode of access: World Wide Web.

System requirements: Adobe Acrobat Reader.

c.1, c.2

US Navy (USN) author.

upgraded and digitize 2/17/09 dk