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Proceedings of IEEE Ultrasonics Symposium ULTSYM-94
The schlieren method, based on Raman-Nath scattering by ultrasonic waves, is extended to pressures up to 8 . 8~1 0~ Pa (about 5KW/cm2 for 4 MHz CW waves) by capturing up to the 16" order diffraction harmonics in water. Given the high spatial resolution ( -100 pm), this kind of measurement is not possible with conventional hydrophones. Working under partially applicable Raman-Nath regime (thin grating, Q = 0.01 6 4 27r but 0 < Y < 2000), the theoretical description fails beyond the first fewdoi:10.1109/ultsym.1994.401932 fatcat:5ik4anxwfbbrlatjgtki6eg2hi