We present in this paper a new kind of laser-based microphone device capable of detecting minute displacements of the microphone diaphragm, leading to drastically improved sensitivity in detecting the impinging pressure waves like acoustic waves and water waves over existing state-of-the-art laser and fiber-optic microphones. The drastically improved sensitivity in detecting diaphragm surface displacements of the novel laser microphone leads to niche applications including the photoacoustic detection of molecules and ...
When the speckle pattern (laser or white light) of a corroded specimen surface is compared to that of a virgin surface, the difference can be quickly and clearly revealed by the cross-correlation coefficient of the two speckle patterns. This technique can reveal pitting corrosion areas as small as 5 x 5 mm (0.2 x 0.2 in.) wherein exists a cluster of pits of 0.3 mm (0.012 in.) in diameter and ...
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