Accession Number:

ADA207286

Title:

Bubble Detection Using a Dual Frequency Sound Field

Descriptive Note:

Master's thesis

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s):

Report Date:

1988-12-01

Pagination or Media Count:

134.0

Abstract:

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 micro 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. Keyword Bubble resonance frequency Nonlinear bubble dynamics Bubble detection Bubble size Dual frequency. Theses.

Subject Categories:

  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE