Effect of half-wavelength membranes on the axial resolution of real-time ultrasonic scanners

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Abstract
The effect of interposing a half-wavelength [acoustic] membrane between the transducer and the load in mechanically sectored ultrasonic scanners was investigated. The effects of impedance mismatch and detuning on broadband spectra were theoretically and experimentally studied. These studies indicate that for certain common cases, a bandwidth reduction of 20%-30% can be anticipated, resulting in a proportional decrease in the axial resolution.

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