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A new laser-based sensor, developed by a team at the University of Mississippi, can detect buried objects such as land mines even while the detector is in motion. The new device, called a Laser Multi Beam Differential Interferometric Sensor (LAMBDIS), provides detection capabilities comparable to laser Doppler vibrometers (LDVs), but is less sensitive to motion, allowing it to be used aboard a moving vehicle.
LAMBDIS uses a linear array of 30 laser beams directed onto the interrogated area. A receiver lens and a shearing interferometer are used to combine the light that is reflected from different points on the ground on a photodetector array (PDA), resulting in interference signals on the PDA outputs. The frequency of the signals is…READ MORE