Experimental Evaluation of Thin-Walled Glass Spheres as Deep-Water Acoustic Sources

09/28/99

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Table of Contents

Experimental Evaluation of Thin-Walled Glass Spheres as Deep-Water Acoustic Sources

An žIdealÓ Acoustic Source for CTBT Hydro Research Would...

What Could We Do With This Source?

Imploding Light Bulbs Have Been Used for Many Years in Shallow Water Experiments

The žOld MonitorÓ Acoustic Source

Histogram of SOFAR Channel Depths in the Mid-Atlantic

Histogram of SOFAR Channel Depths in the Mid-Pacific

Physics of the Imploding Sphere Source

Stress Analysis - Failure Depth of a Thin-Walled Glass Sphere

Failure Depth of a Glass Sphere

Plastic Flow in Glass

Experiment at Dabob Bay, WA - March 1999

Dabob Bay Bathymetry

Dabob Bay Sound Velocity Profile

Experiment Geometry and Equipment

Close-up of 14-inch Glass Sphere

Glass Sphere Deployment

Close-up of Smasher

Smasher Being Deployed

Pressure Time Series at 90-ft Hydrophone

Close-up of Implosion Signal at 90-ft Hydrophone

Spectrum of Implosion

Pressure Time Series at 150-ft Hydrophone

Comparison of Hydrophone Data

Tether Retrieved After Experiment

Bubble Pulse Calculation

Equivalent TNT Weight

Energy Calculation

How Far Would the Signal Propagate?

Issues for Study

Summary and Conclusions

Author: Jay J. Pulli

Email: jpulli@bbn.com