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An Electroacoustic Transducer for Measuring Acoustical Impedances
The paper discusses the operation and design of an electroacoustic transducer which may be used as an accurate source of known acoustic volume velocity for acoustic measurements, especially for measurement of acoustic impedances. The operation of the transducer is analyzed in greater detail for the high-frequency region, where the output throat dimensions are comparable with the wavelength of the signal being generated. The amplitude and phase corrections for compensating the influence of the first transverse resonance in the trandsucer output throat area are derived by solving the wave equation under boundary conditions determined by the configuration of the transducer's acoustic output side. The transducer was designed with an output throat diameter of 24 mm, facilitating its use at frequencies up to 10 kHz. A built-in correction network makes it possible to compensate for the phase-shift originating in the measuring microphone.
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