10.8. Transducer Calibration

Some basic transducer characteristics have to be known before use as a hydrophone or projector in order to make reliable and reproducible measurements. The transducer has to be calibrated. The calibration is only valid within the ranges of frequency, hydrostatic pressure, and temperature, where it was performed. An extrapolation from these conditions is frequently not possible. Since a calibrated transducer may change its calibrated values, a new calibration before and after performing critical measurements involving the transducer is frequently recommended. The primary requirements of a hydrophone or projector are stability and linearity. The hydrophone sensitivity should in general be independent of frequency, time, ...

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