Landmine Detection using Laser Vibrometry

摘要

Acoustic Landmine Detection (ALD) using a laser vibrometry was studied using two acoustic ground excitation methods: acoustic (loudspeaker) excitation (AE) and laser excitation (LE). AE is suitable for detecting buried landmines but is a slow technique. A faster AE method based on a CMOS camera was proposed but not studied further. LE is potentially a faster technique but suffers from surface effects. An important surface effect is the relaxation of the surface after the disturbance by the laser excitation pulse. This relaxation lasts for more than 4 ms in the vicinity of the laser-excitation spot. Due to these surface effects, LE does not seem to be a viable technique in combination with laser vibrometry.