Logging device loaded with dielectric material to minimize spuri

Details Logging device loaded with dielectric material to minimize spuri Logging device loaded with dielectric material to minimize spuri

1983-08-23

1986-07-29

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

With radiant energy or nonconductive-type transmitter

324341, G01V 330

Patent

active

046032975

ABSTRACT:
The disclosure is applicable to a borehole logging device of the type which includes an elongated body suspendable in a borehole and having at least one transmitting antenna and at least one receiving antenna mounted in spaced relation in the body. Energizing signals are applied to the transmitting antenna to produce electromagnetic energy, a portion of which is received at the receiving antenna after being affected by earth formations surrounding the borehole. In accordance with the disclosed invention, a region of the body is loaded with a dielectric material having a dielectric constant selected to minimize, at the receiving antenna, the effect of spurious transverse magnetic mode components of standing wave electromagnetic energy within the body. Preferably, the dielectric material is selected to have a dielectric constant which adjusts the wavelength of the spurious transverse magnetic mode components of standing wave electromagnetic energy such that the standing wave has substantially a minimum amplitude at the receiving antenna. In an illustrated embodiment, a dielectric material is loaded in the region between the receiving antenna and a conductive end cap proximate thereto and also in the region between the transmitting antenna and the end cap proximate thereto, and a lossy dielectric material is loaded in the region between the transmitting antenna and the receiving antenna.

REFERENCES:
patent: 3249858 (1966-05-01), Gouilloud
patent: 3403328 (1968-09-01), Fossati et al.
patent: 4209747 (1980-06-01), Huchital et al.
patent: 4401947 (1983-08-01), Cox
patent: 4451789 (1984-05-01), Meador
patent: 4461997 (1984-07-01), Ohmer

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