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Characterization of measurement system effects in ultrasonic scattering experiments
1Department of Electrical Engineering, University of Rochester, New York 14642.
The Journal of the Acoustical Society of America
|November 1, 1990
Summary
This study presents a general model for ultrasonic scattering measurements, accounting for system effects like beam patterns and time gates. The model helps optimize experiments by understanding how measurement system characteristics influence scattering results.
Area of Science:
- Acoustics
- Ultrasonic Measurement
- Wave Scattering
Background:
- Experimental determination of ultrasonic scattering is influenced by measurement system characteristics.
- Characterizing these system effects is crucial for accurate interpretation of scattering data.
Purpose of the Study:
- To develop a general model for ultrasonic scattering that incorporates system effects.
- To provide a framework for designing scattering experiments with minimized system-induced degradations.
Main Methods:
- Developed a model representing emitter beams and detector apertures as angular spectra of plane waves.
- Incorporated arbitrary emitted pulses and detector time gates via frequency spectra.
- Employed a variable transformation to express measured pressure spectra in wave space.
Main Results:
- The model expresses measured pressure spectra as a product of a system function and medium variations.
- Mean-square measured pressure spectra are related to the squared system function magnitude and medium power spectrum.
- Identified conditions where medium properties can be factored out, simplifying measurements.
Conclusions:
- The developed model quantifies the impact of ultrasonic measurement systems on scattering experiments.
- Results aid in designing experiments to mitigate system-induced blurring and weighting effects.
- Accurate characterization of system effects leads to reliable ultrasonic scattering data.