Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1985-10-17
1988-05-24
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324337, 342 22, 342459, 343797, 343895, 343911R, G01V 312, G01S 1306, H01Q 1508, H01Q 2126
Patent
active
047468670
ABSTRACT:
An antenna assembly is provided for use in locating buried objects, particularly long thin objects such as pipes can be located, determining the position, and ascertaining the pipe direction by taking measurements from a single point, without mechanical movement of the antenna, and allowing a better suppression of spurious signals and reduction in false indications; which assembly has a plurality of antenna arms adapted and arranged to transmit and receive radiation into the ground and is characterized in that the arms have, on at least the surface nearest the ground, a cladding of a substantially lossless dielectric material, the relative permitivity of said dielectric being at least 3.5 and the thickness of said coating being at least .lambda..sub.d /20 where .lambda..sub.d is the wavelength of lowest frequency of the radiation to be transmitted from the antenna.
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Patent Abstracts, "Radar for Detecting Underground Object", vol. 8, No. 192, Sep. 4, 1984.
Patent Abstract, "Antenna for Searching Underground Object", vol. 8, No. 107, May 19, 1984.
British Gas Corporation
Strecker Gerard R.
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