Characteristic discriminating landmine hand prodder
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United States of America Patent
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-
May 19, 1998
Grant Date -
N/A
app pub date -
Dec 5, 1996
filing date -
Dec 5, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A hand-held prodder capable of distinguishing inert rock from potentially hazardous landmines or other unknown objects. The prodder comprises a rod which is placed into contact with an object. A high frequency acoustic or incident wave is introduced into rod and travels along the rod to the object where it is reflected back towards the piezoelectric crystal. The piezoelectric crystal converts the reflected wave to an electric signal and a signal processor determines values representative of the frequency-time-amplitude characteristics of the object. Different materials exhibit different mechanical impedances and frequency damping characteristics. By comparing reflected wave characteristics to pre-determined characteristics for known materials, inert rocks and potentially hazardous plastic or metallic objects are distinguishable. Visual or audible signals inform the user whether rock (safe) or unidentified or known hazardous object were contacted.
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