Object detector for detecting buried objects

Details Object detector for detecting buried objects Object detector for detecting buried objects

1994-09-08

1996-10-08

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367 13, 181108, 73594, 73602, G01S 1504, G01N 2900

Patent

active

055638481

ABSTRACT:
An object detector for detecting metallic or non-metallic objects is disclosed which comprises a sound source such as a speaker (12) for generating impulse short sound bursts. A tube (16) conducts the acoustic signal from the speaker to the ground and at least one microphone M1-M3 is utilised for detecting reflections from the ground. A reflection from a buried object is compared with a reference signal which may be obtained from another microphone M1, M2 or earlier in time from the same microphone M3. The reflected and reference signals are subtracted to provide a difference signal and a difference signal is correlated with the original acoustic signal to provide an indication of an object. Time windows may be set to enable analysis of different depths to be obtained.

REFERENCES:
patent: 3500301 (1970-03-01), Meier
patent: 4128011 (1978-12-01), Savage
patent: 4429575 (1984-02-01), Akishaka
patent: 4922467 (1990-05-01), Caulfield
patent: 5357063 (1994-10-01), House et al.

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