The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 1986
Filed:
Aug. 23, 1983
Kambiz A Safinya, Ridgefield, CT (US);
Schlumberger Technology Corporation, New York, NY (US);
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.