Combined Measurement of Cone Vibration and 3D Sound Pressure output of Transducers
* Presenting author
Measuring the cone of an electroacoustic transducers using a triangulation laser, the vibration behavior as well as the geometry of the membrane can be exploited. These mechanical information can be used to predict the acoustical output of the loudspeaker using Bounded Element Modeling (BEM). A fast alternative to these time-consuming calculation is Rayleigh’s integral equation, which considers the vibration but neglects the curvature of the cone. Consequently, the accuracy of the extrapolated sound field data is limited. Measuring with a microphone in the near field of the transducer and using a holographic approach to extrapolate the far field gives a much more accurate description of the 3D sound pressure output. The paper will present how the measurements can be combined using the same hardware to measure automatically accurate both mechanical and acoustical data of an electroacoustic transducer.