Measurement Methods for Low-Frequency Transducers
This paper describes two methods which are used in GERDSM to calibrate low frequency transducers. The first technique is based on cross correlation functions. The feasibility of the technique has been demonstrated for transducers with low quality factor Q and its extension to projectors with high quality factor Q is described. A second method which reduces the transient part of the acoustic pressure by controlling the headmass velocity of the transmitting transducer has been tested successfully on actual projectors.
KeywordsInput Signal Cross Correlation Function Acoustic Pressure Analog Circuit Coherence Function
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