Abstract
A unique experimental capability for measuring both the interior and exterior three‐axis surface motions of a completely submerged ribbed cylindrical shell has been developed. This system is composed of two three‐dimensional laser Doppler vibrometers positioned by a pair of high‐precision robots. The two vibrometers work together to measure the three‐components of velocity up to 50 kHz on both the interior and exterior cylinder surfaces. For the interior, a compact three‐dimensional vibrometer was designed and constructed to operate in conjunction with a cylindrical‐based scanner mounted to the stiff endcaps of the shell. This scanning system is capable of positioning the laser vibrometer with a precision of +/− 3 mil over 100% of the interior cylinder surface. A second three‐dimensional laser vibrometer designed for exterior (in‐water) operation was constructed and integrated into the NRL near‐field acoustic holography system. This large workspace Cartesian‐based scanner is capable of collocating the foc...
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