The recent introduction of hand-held intensity measurement equipment has created a growing need for verification of the measurement equipment in the field. The key feature for easy field use is the possibility of calibrating the two-microphone intensity probe without dismounting the spacer. Working models were built, but none of them worked to more than approximately 3 kHz. Compliance with IEC 61043 requires the calibrator to work up to 7.1 kHz. A lot of modifications on these models were tried, but none of them worked. The development project was close to being stopped. A boundary-element model of the sound intensity calibrator was built. It verified the measured result from the working models. Based on the boundary-element model the best type and position of the sound source and the optimum dimensions of the calibrator cavity were found. Measurements on a final model verified the simulation results. The calibrations could now be made without dismounting the spacer.
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