Moving coil transducer:structure,performance,and applications and development trends in acoustic simulation and calibration
Moving coil transducers have been widely applied to such fields as ship noise simulation and sonar system calibration because of their small size,ultra-low frequency,and ultra-wideband emission.This paper summarized the structure and performance of moving coil transducer.The principle of ultra-low frequency and ultra-wideband emission was described in this paper.The research work of domestic and foreign scholars on the optimization of the driving magnetic circuit,the expansion of the working bandwidth,and the improvement of the working depth were also reviewed.Several hot issues in the research of moving coil transducer,such as nonlinear distortion and the influence of acoustic cavity on the performance,were discussed.It was proposed that optimizing the driving magnetic circuit to reduce the nonlinearity of the output force and improving the impedance matching between the moving coil transducer and the power amplifier can reduce the waveform distortion and harmonic distortion.The fluctuation of the source level can be suppressed by filling the gas with small characteristic impedance into the acoustic cavity.The future trend of moving coil transducer was also prospected.The research of moving coil transducer should focus on improving the ultra-low frequency acoustic radiation performance in large depth environment,increasing the continuous working time and reliability,and reducing the nonlinear distortion,so as to meet the application requirements.
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