Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1993-01-29
1995-11-28
O'Shea, Sandra L.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324 67, 324233, 324243, G01V 310
Patent
active
054711436
ABSTRACT:
An apparatus for locating obscured conduits, such as buried cables, employs a novel signal processing technique to increase the sensitivity of the apparatus, particularly in congested areas. The cable locating apparatus is similar to prior art dual-peak detection devices which compare signals from two parallel induction coils, but a phase shift is introduced into one of the signals prior to the comparison. This phase shift serves to minimize the effects of side minima in the response curve of prior art dual-peak devices. This effect is enhanced by adding a gain mismatch to the two detected signals. The locator preferably operates with analog signals to reduce expense.
REFERENCES:
patent: 2252059 (1941-08-01), Barth
patent: 2921179 (1960-01-01), Anderson
patent: 3617865 (1971-11-01), Hakata
patent: 3729675 (1973-04-01), Vosteen
patent: 3808519 (1974-04-01), Lemercier et al.
patent: 3860866 (1975-01-01), Dornberger
patent: 3889179 (1975-06-01), Cutler
patent: 3988663 (1976-10-01), Slough et al.
patent: 4091322 (1978-05-01), Stankoff
patent: 4119908 (1978-10-01), Cosman et al.
patent: 4134061 (1979-01-01), Gudgel
patent: 4220913 (1980-09-01), Howell et al.
patent: 4258813 (1981-03-01), Rubel
patent: 4295095 (1981-10-01), Thomas et al.
patent: 4387340 (1983-06-01), Peterman
patent: 4390836 (1983-06-01), Bruce et al.
patent: 4427942 (1984-01-01), Sole
patent: 4438389 (1984-03-01), De Sa
patent: 4458204 (1984-07-01), Weber
patent: 4520317 (1985-05-01), Peterman
patent: 4542344 (1985-09-01), Darilek et al.
patent: 4639674 (1987-01-01), Rippingale
patent: 4665369 (1987-05-01), Faller et al.
patent: 4672321 (1987-06-01), Howell
patent: 4686454 (1987-08-01), Pecukonis
patent: 4691165 (1987-09-01), Szedlmajer
patent: 4767237 (1988-08-01), Cosman et al.
patent: 4843324 (1989-06-01), Humphreys, Jr. et al.
patent: 4942365 (1990-07-01), Satterwhite
patent: 4990852 (1991-02-01), Kirkland
patent: 5001430 (1991-03-01), Peterman et al.
patent: 5093622 (1992-03-01), Balkman
patent: 5119028 (1992-06-01), Mooney et al.
patent: 5210497 (1993-05-01), Regini
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Co.
Musgrove Jack V.
O'Shea Sandra L.
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