Device for transmitting and receiving microwave radiation, for forming images of buried objects
First Claim
1. A device, disposed in a first medium, for transmitting and receiving radiation and for forming an image of an object buried in a second medium, comprising:
- a micro-wave source,at least one transmitting antenna connected to the source and having a radiating opening substantially in the form of a rectangular wave-guide, applied against a surface which separates the first medium from the second medium,at least one receiving antenna having a collecting opening substantially in the form of a rectangular wave-guide applied against the separation surface and disposed so that a large side of said radiating opening and a large side of said collecting opening are side by side, said receiving antenna comprising a line of pinpoint antennae disposed in said collecting opening and an output delivering a collected micro-wave signal,means for modulating the impedance of each of said pinpoint antennae successively by a low frequency signal, andmeans for forming said image of an object buried in the second medium in response to said collected micro-wave signal at the position of each of said pinpoint antennae and said low frequency signal.
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Accused Products
Abstract
A transmitting antenna radiates a micro-wave field through an opening in the form of a rectangular wave-guide applied against the separation surface between a first medium, in which it is located, and a second medium, in which an object is buried. The micro-wave radiation reflected by the object is collected through the opening of a receiving antenna, also in the form of a rectangular wave-guide, applied against the radiating opening of the transmitting antenna. The collected radiation is measured at a series of points by means of pinpoint antennae located in the collecting opening. Thanks to the antennae arrangement, the collected radiation can be used as such, without having to subtract therefrom the result of a reference measurement. The invention can be used particularly to obtain, non destructively, images of metal bars buried in reinforced concrete.
41 Citations
9 Claims
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1. A device, disposed in a first medium, for transmitting and receiving radiation and for forming an image of an object buried in a second medium, comprising:
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a micro-wave source, at least one transmitting antenna connected to the source and having a radiating opening substantially in the form of a rectangular wave-guide, applied against a surface which separates the first medium from the second medium, at least one receiving antenna having a collecting opening substantially in the form of a rectangular wave-guide applied against the separation surface and disposed so that a large side of said radiating opening and a large side of said collecting opening are side by side, said receiving antenna comprising a line of pinpoint antennae disposed in said collecting opening and an output delivering a collected micro-wave signal, means for modulating the impedance of each of said pinpoint antennae successively by a low frequency signal, and means for forming said image of an object buried in the second medium in response to said collected micro-wave signal at the position of each of said pinpoint antennae and said low frequency signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification