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An Electroacoustic Transducer for Measuring Acoustical Impedances

In the paper the function is analyzed and the design is described of an electroacoustic transducer, which may be used as an accurate source of a known acoustic volume velocity for acoustic measurements, specially for measurements of acoustic impedances. The working of the transducer is analyzed in greater detail for the high frequencies region, where the output throat dimensions are comparable with the wavelength of the signal being generated. The amplitude and phase correction for compensating the influence of the first transverse resonance in the space of the transducer output throad is being investigated on the basis of solving the wave equation under boundary conditions, determined by the configuration of the transducer acoustic output side. The transducer is designed with an output throad diameter of 24 mm, facilitating its use at frequencies up to 10kHz. A built-in correction network enables also the phase shift originating in the measuring microphone to be compensated.

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