The possiЬility of calibrating sound detectors in the near-zone field within real areas is shown. On the basis of experimental data it is demonstrated that the conditions needed for the spherical decrease of the field in real laboratory areas are met within the operating frequency range over horizontal distance up to 60-80 cm. Comparison of the data on calibration of а PGD channel in the near-zone field with similar data oЬtained for other controlled environments showed good agreement.
Department of Acoustics
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