| 摘要 |
A probe 1 for measuring the electromagnetic properties of a down-hole materi al MC, GF, DM of a well-bore WB comprises a metallic pad 2 in contact with the down - hole material. The pad 2 further comprises an open-ended coaxial wire 4 coupled t o an electronic circuit 3. The open-ended coaxial wire 4 comprises an inner conductor 4A sunk in an insulator 4B and is positioned sensibly perpendicularly to the we ll- bore wall. The electronic circuit 3 is able to send a high-frequency input signal into the open-ended coaxial wire 4 and to determine a reflection coefficient based on a high-frequency output signal reflected by the open-ended coaxial wire 4.</SD OAB>
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