Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With beam steering – scanning – or focussing
Patent
1993-12-14
1995-09-19
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With beam steering, scanning, or focussing
73 405A, 73584, G01S 380, G01H 1700
Patent
active
054522633
ABSTRACT:
A method and apparatus for detecting the location of subterranean pipe includes sensors 24 and 26 which detect seismic energy. A pulsing valve (20) is disposed on one end of a water line (10) to allow water to intermittently flow and be shut off. This results in a water hammer effect which send shock waves (22) outward from the pipe (10). This is detected by the sensors (24) and (26) and then transmitted to a detector (32) to provide a differential indication. The locations of the sensors (24) and (26) will determine the differential balances therebetween such that when the sensors (24) and (26) are directly over the pipe (10), an indication of the location of the pipe is provided. Further, a reference sensor (19) is provided to allow distance measurement along the pipe by measuring the difference between the received energy at sensor (19) and either of sensors (24) or (26).
REFERENCES:
patent: 3979724 (1976-09-01), Silverman et al.
patent: 4083229 (1978-04-01), Anwey
patent: 4911012 (1990-03-01), Ziska
patent: 5036497 (1991-07-01), Heitman
Howison Gregory M.
Lobo Ian J.
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