ASD Technical Report, Numéro 62,Partie 8

1/4 inch Collimator 1/4 Inch Plate 3/4 inch Dia 3/4 inch diameter acoustic impedance acoustical properties alloy Aluminum Annealed apparent attenuation Attenuation Comparator attenuation losses Automation Industries Lithium B120VCA Titanium back echoes back surface Beam collimation C.P. Molybdenum Control Set Datum Line Curves decibels decrease dia RB energy loss Facsimile Paper Recording flat bottom holes focused transducers Forged Bar Group II Materials Heat Treatment Immersed LEGEND Immersed Tests impedance loss impedance mismatch inch test holes INCHES OF METAL INCHES OF SIGNAL Incident Angle investigations longitudinal waves material variables mc mc mc metal distance METAL TRAVEL number of back observed obtained Photomicrographs pulse-echo Recording of 1/4 Recording of Thick reflected signal reflection coefficient Reflector Technique Refractometer Rolled Bar shear and surface shear waves shown in Figure Signal Amplitude versus SIGNAL HEIGHT signal response surface Rayleigh surface waves test blocks test frequency Thick Test Plate thin plates Vascojet WADC wavelength Wright-Patterson AFB