Automatic impedance matching conduit locator

Details Automatic impedance matching conduit locator Automatic impedance matching conduit locator

1978-12-07

1980-11-11

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

323 435S, 333 17M, G01V 308, G05F 124, H03H 738

Patent

active

042335612

ABSTRACT:
A battery powerable electrical signaling apparatus for assisting in locating a concealed electrically conductive element, such as an underground pipe. Provided in the apparatus is circuitry which functions automatically to change the output impedance of the apparatus, when such is coupled electrically to a pipe or like element, so as to match as closely as posible, the apparatus' output impedance with that of the hidden element. Thus, the proposed circuit conserves limited energy of a battery, and extends service life.

REFERENCES:
patent: 3066256 (1962-11-01), Rasor
patent: 3237091 (1966-02-01), Attewell
patent: 3418572 (1968-12-01), Humphreys
patent: 3530369 (1970-09-01), Thompson
patent: 3706024 (1972-12-01), Wood
patent: 3970918 (1976-07-01), Cooper
patent: 4011499 (1977-03-01), Betsill et al.

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