Edward Tucholski, Ph.D., Physics Department

Research

Measuring Angular Variation of Target Strength for Simple Geometric Objects

Presentation for the 153rd Meeting of the Acoustical Society of America, 6 Jun 07, Salt Lake City, Utah.

Target Strength Poster







Target Strength Poster


Abstract: Understanding the active sonar equation is a fundamental skill for a course in Underwater Acoustics and Sonar such as that taught at the United States Naval Academy. Students must develop an intuitive understanding of each term in both the noise limited and reverberation limited cases. In this tabletop demonstration, the angular dependence of the Target Strength term is explored using commercially available 25 and 40 kHz airborne piezoelectric transducer/receiver pairs. By rotating standard target shapes (e.g. rectangular plates, circular plates, finite cylinders, ellipsoids), reflected intensity is measured as a function of angle of rotation. The measured data is compared with that predicted by standard theoretical models. While the same measurements could be made in a tank using submerged transducers, the airborne transducers offer the advantage of lower cost and simplicity of apparatus. Additionally, unwanted modal interference from sound reflection off tank surfaces is reduced in the airborne measurement. By direct observation, future sonar operators and designers are able to study target strength in order to understand how to position their sensors to optimize their own active sonar performance while positioning their own ships to minimize detection by opposition active sonar.

Presentation: Target Strength.ppt

Conference Proceedings in POMA:   Tucholski POMA TS Paper.pdf



Classroom Ultrasonic Beam Forming Demonstration

Presentation for the 4th Joint Meeting of the Acoustical Society of America/Acoustical Society of Japan 29 Nov 06, Honolulu, HI

ASA Beamforming Poster







ASA Beamforming Poster


Abstract: Understanding the active sonar equation is a fundamental skill for a course in Underwater Acoustics and Sonar such as that taught at the United States Naval Academy. Students must develop an intuitive understanding of each term in both the noise limited and reverberation limited cases. In this tabletop demonstration, the angular dependence of the Target Strength term is explored using commercially available 25 and 40 kHz airborne piezoelectric transducer/receiver pairs. By rotating standard target shapes (e.g. rectangular plates, circular plates, finite cylinders, ellipsoids), reflected intensity is measured as a function of angle of rotation. The measured data is compared with that predicted by standard theoretical models. While the same measurements could be made in a tank using submerged transducers, the airborne transducers offer the advantage of lower cost and simplicity of apparatus. Additionally, unwanted modal interference from sound reflection off tank surfaces is reduced in the airborne measurement. By direct observation, future sonar operators and designers are able to study target strength in order to understand how to position their sensors to optimize their own active sonar performance while positioning their own ships to minimize detection by opposition active sonar.

Presentation: Two Element Beam Patterns.ppt

Paper: Beamforming AJP Paper



NDT of Aircraft and Spacecraft Wiring

Presentation and Paper before the 16th World Congress on Nondestructive Testing 30 August 2004, Montreal Canada

Abstract: Spacecraft, and especially aircraft, often fly well past their original design lives and, therefore, the need to develop nondestructive evaluation procedures for inspection of vital structures in these craft is extremely important. One of the more recent problems is the degradation of wiring and wiring insulation. This paper describes three nondestructive characterization methods which afford the possibility to detect wiring and insulation degradation in-situ prior to major problems with the safety of aircraft and spacecraft.

Presentation: TucholskiEdwardAug30min.ppt

Paper: 16th World Congress NDE.pdf

Materials Evaluation Paper: White Tucholski Green.pdf



Acoustic Einstein Hopf Drag on a Bubble

Physics Review Letters Paper: PRL Larraza.pdf

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