Electricity: measuring and testing – Of geophysical surface or subsurface in situ – With radiant energy or nonconductive-type transmitter
Patent
1991-07-19
1993-02-09
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
With radiant energy or nonconductive-type transmitter
324335, G01V 312, G01V 330, G01V 338
Patent
active
051855780
ABSTRACT:
A method utilized with an underground conductor detection system for calibrating a downhole transmitter to compensate for detuning of the transmitter antenna by geologic formations. The method comprises sending a synchronization signal to the transmitter antenna, measuring the current flow through the transmitter antenna and adjusting the current to a constant level, and measuring the phase difference between the transmitter antenna current and the synchronization signal. A receiver transmitter is calibrated by sending a synchronization signal to a radiating antenna in the receiver that in turn sends a calibration signal to the receiver antenna that is directed over the entire signal pathway back to surface located signal processing equipment. Another method of underground conductor detection sends a surface wave to the downhole receiver to cancel the effect of the surface wave modulation on a target wave being radiated by the underground detector. Another method of underground conductor detection utilizes a receiver tuned loop antenna oriented orthogonal to the magnetic dipole of the transmitter antenna for discriminating against reception of a primary wave. Another method of detecting anomalous geological zones such as tunnels, utilizes a low to medium frequency tomographic scan to cancel the effect of geological conductivity noise in a high to very high frequency tomographic scan of a region suspected of containing the anomalous geological zone.
REFERENCES:
patent: Re32563 (1987-12-01), Stolarczyk
patent: 3065408 (1962-11-01), Marsh
patent: 3609522 (1971-09-01), Hutchins et al.
patent: 3690164 (1972-09-01), Gabillard et al.
patent: 3984758 (1976-10-01), Millon
patent: 4161687 (1979-07-01), Lytle et al.
patent: 4290020 (1981-09-01), Hansen et al.
patent: 4393350 (1983-07-01), Hansen et al.
patent: 4507611 (1985-03-01), Helms
patent: 4542344 (1985-09-01), Darilek et al.
patent: 4577153 (1983-03-01), Stolarczyk
patent: 4691166 (1987-09-01), Stolarczyk
patent: 4742305 (1988-05-01), Stolarczyk
patent: 4875015 (1989-10-01), Ward
Hansen, R. C., Radiation and Reception With Buried and Submerged Antennas, IEEE Trans. on Ant. and Prop. (May 29, 1963) pp. 207-215.
Moore, R. K., Effects of Surrounding Conducting Medium on Antenna Analysis, IEEE Trans. on Ant. Prop. (May 1963) pp. 216-231.
J. R. Wait & D. A. Hill, Coaxial and Bifilar Modes on a Transmission Line in a Circular Tunnel, Preliminary Report to U.S. Bureau of Mines on Contract No. H0122061 (Sep. 1974).
R. N. Grubb et al., Borehole Measurements of Conductivity and Dielectric Constant in the 300 kHz to 25 MHz Frequency Range, Radio Science, vol. II, No. 4 (Apr. 1976) pp. 275-283.
J. R. Wait, The Magnetic Dipole Antenna Immersed in a Conducting Medium, Proceeding of the IRE (Oct. 1952) pp. 1244, 1245.
J. R. Wait, Electromagnetic Fields of Source in Lossy Media, published in Antenna Theory (R. E. Collins & F. J. Zucker, editors) McGraw-Hill Book Co., pp. 438-451.
R. F. Harrington, Time Harmonic Electromagnetic Fields, McGraw-Hill, N.Y., pp. 232-236 (1961).
P. F. Panter, Modulation, Noise, and Spectral Analysis Applied to Information Transmission, McGraw-Hill Book Co., pp. 461-505 (1965).
R. J. Lytle et al., Cross-borehole Electromagnetic Probing to Locate High Contrast Anomalies, Geophysics, vol. 44, pp. 1667-1676 (Oct. 1979).
Schatzel Thomas E.
Stolar, Inc.
Strecker Gerard R.
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