Abstract
Land mines can be detected by scanning the ground with a laser doppler vibrometer (LDV) to measure the motion (velocity) of the ground as it is being sonified. However, the system at times suffers from a low signal-to-noise ratio, especially when trying to detect deeply buried mines. If the signal-to-noise ratio could be improved, these mines could be more easily detected. One contribution to the noise is due to the acoustically induced vibration of the LDV. This noise is difficult to filter digitally or electronically since it occurs at the same frequency as the ground motion being measured. Passive noise and vibration control remedies have been incorporated with some success. These include enclosing the LDV within a box and mounting it on damped springs. However, it is impossible to make the LDV completely stationary at all frequencies. The translation of the LDV beam over anything other than a completely smooth surface will appear to the LDV as an out-of-plane motion of the surface. The noise and vibration control strategies will be presented and discussed, along with measurements showing both their effectiveness and limitations.
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