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Nondestructive Sensor Using Microwaves From Laser Plasma by Subnanosecond Laser Pulses

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5 Author(s)
Nakajima, H. ; Ground Syst. Res. Center, Tech. R&D Inst., Sagamihara, Japan ; Shimada, Y. ; Somekawa, T. ; Fujita, M.
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Conventional ground-penetrating radar (GPR) requires large-aperture antennas or long-span measurements to survey a remote location precisely. We propose a laser-driven GPR (LGPR) as a new detection method. LGPR uses microwaves from laser-produced plasmas as remote transmitters and can survey a remote location using a compact instrument. We performed numerical simulations to investigate the radiation mechanism of microwaves from laser plasmas and confirmed the pulsewidth of the laser suitable for LGPR. Experiments with subnanosecond pulse lasers clarified the feasibility and detection performance of LGPR.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:6 ,  Issue: 4 )