Noncontact modal analysis of a pipe organ reed using airborne ultrasound stimulated vibrometry.

摘要: The goal of this study was to excite and measure, in a noncontact manner, the vibrational modes reed from organ pipe. To perform ultrasound stimulated excitation, audio-range difference frequency between pair beams produced radiation force that induced vibrations. resulting deflection shapes were measured with scanning laser vibrometer. resonances any relatively small object can be studied air using technique. For 36mm×6mm brass reed, displacements velocities excess 5μm 4mm∕s could imparted at fundamental 145Hz. Using same transducer, excitation across entire range audio frequencies obtained. Since beam focused on eliminated background effects observed during mechanical shaker such as vibrations clamps supports. results obtained single, dual confocal transducers AM two-beam mo...