An underground object detector can locate and identify the shape of underground objects using a pulsed laser to generate acoustic waves in soil. A remotely located microphone detects an acoustic signal between the soil surface and subsurface objects. The amplitude of this acoustic signal is correlated with the position of the laser beam source and output on a visual display, resulting in an acoustic map of the ground. A raster scanning of the suspect ground in the vicinity reveals the shape of the underground object, allowing the operator to discriminate benign and natural objects.
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