Title :
Optical detection of ultrasonic leaky waves from solids in air
Author :
Mattei, C. ; Adler, L.
Author_Institution :
Adler Consultants Inc., Columbus, OH, USA
Abstract :
A recently developed optical heterodyne interferometer is proved to be sensitive to detect ultrasonic waves leaking out from solids at centimeters away from the metal surface in air. This measurement is based on the detection of the optical index variation in air due to the leaky wave. This optical method can be used for metals with low reflectivity surfaces. Thus it can be used for non-polished surfaces and can be extended for non-contact nondestructive evaluation applications.
Keywords :
Rayleigh waves; acoustic signal detection; acousto-optical modulation; heterodyne detection; light interferometry; phase modulation; refractive index; surface acoustic waves; ultrasonic materials testing; ultrasonic waves; Mach-Zehnder interferometer; Raman-Nath parameter; acousto-optic modulation; air/solid interface; leaky Lamb waves; leaky Rayleigh waves; low reflectivity surface metals; noncontact NDE; optical detection; optical heterodyne interferometer; optical index variation; phase modulation; solids in air; ultrasonic leaky waves; unpolished surfaces; Leak detection; Optical detectors; Optical interferometry; Optical mixing; Optical sensors; Optical surface waves; Reflectivity; Solids; Surface waves; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE
Conference_Location :
Caesars Tahoe, NV
Print_ISBN :
0-7803-5722-1
DOI :
10.1109/ULTSYM.1999.849458
