Reciprocity calibration in a compliant cylindrical tube
Johnson, Michael B.
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A new method for absolute calibration of electroacoustic transducers is described which permits low frequency reciprocity calibration in a test apparatus of small dimensions. The method takes advantage of the reduced wave speed in a cylindrical water column bounded by a compliant PVC tube to reduce the length of the standing wave to dimensions which can be easily handled in the laboratory. Results of a limited series of experiments show a mean reproducibility of :0.8 decibels in a one-meter long tube at frequencies between 750 and 1100 Hz and sound speeds from 330 to 365 meters/second. The hydrophone voltage sensitivities obtained by the method, however, systematically differ by 1.5 decibels from those measured by comparison with a standard hydrophone; additional research will be required to resolve this discrepancy.
RightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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