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Fig. 3. Calibration of the probe tube microphone. A custom-made probe tube was attached to the microphone of a Bruel & Kjaer Type 2235 Precision Sound Level Meter. The tip of the probe tube was placed near a calibrated Bruel & Kjaer 8103 hydrophone and the sound pressure level (SPL) of both the hydrophone and sound level meter with the probe were measured for different frequencies at a stimulus level of 1 volt RMS applied to a UW 30 speaker in a cylindrical tank. Measurements were made at three different locations in the tank (Trials A, B and C). Probe attenuation, the SPL difference between the hydrophone and the sound level meter with probe, was used to calibrate the probe for use under water.





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