Acoustic source identification using a scanning laser Doppler vibrometer

摘要: This paper shows how a scanning laser Doppler vibrometer (LDV), an instrument designed to measure vibrations of structures or objects, can be used in non-traditional fashion identify acoustical sources. is achieved by measuring the changes optical path induced local fluctuation air refraction index which LDV sensitive. The signal sinusoidal and may recovered at uniform rate over subject area (continuous scan) parallel source axis demodulating this signal. Due fact that measured scan line integral measurement volume between head rigid object needed reflect beam, multiple view planes around acoustic are usually measured. These then passed through tomographic algorithm, thereby reconstructing full sound field. In article however, only one plane measured, but placed on rotating surface with fixed rotational frequency, imposing modulation spectrum. Demodulation will allow reconstruction three-dimensional