Title :
Measurements of air-borne ultrasound by detecting the modulation in optical refractive index of air
Author :
Nakamura, Kentaro ; Hirayama, Manabu ; Ueha, Sadayuki
Author_Institution :
P&I Lab, Tokyo Inst. of Technol., Yokohama, Japan
Abstract :
Sound pressure was measured by a laser Doppler velocimeter (LDV) through the acousto-optic effect of air. First, the author studied the acousto-optic coefficient of air and gave the quantitative relationship between the sound pressure and the LDV output. Then, two-dimensional measurements were demonstrated for a standing wave and a radiated field.
Keywords :
Doppler measurement; air; laser velocimetry; refractive index measurement; ultrasonic measurement; acousto-optic coefficient; acousto-optic effect; air-borne ultrasound measurements; laser Doppler velocimeter; optical refractive index modulation; radiated field; standing wave; Optical modulation; Optical refraction; Optical sensors; Optical variables control; Pressure measurement; Refractive index; Ring lasers; Ultrasonic imaging; Ultrasonic variables measurement; Wavelength measurement;
Conference_Titel :
Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE
Print_ISBN :
0-7803-7582-3
DOI :
10.1109/ULTSYM.2002.1193476
