Spheres for calibrating an eleven-frequency acoustic measurement system
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Calibration of a single resonant transducer by standard sphere is a simple matter. How does one calibrate an array composed of eleven different resonant transducers spanning the frequency range from 27 to 710 kHz? A solution is given by specifying the diameters and target strengths of four precision ball bearings made from tungsten carbide with 6% cobalt binder.