| 摘要 |
PURPOSE:To enable a detector to be used again by drawing out the detector from a concreted space by using the detector wherein two electrodes are arranged on one end portion of a slender support such that the parts of the surfaces of the electrodes are exposed outside the support. CONSTITUTION:A detector 12 comprises first and second electrodes 24 and 26 arranged on one end portion of a slender cylindrical support 22, and the electric wires 29 and 30 of a cable 28 with one and the other ends of the wires 29 and 30 electrically connected to both the electrodes 24 and 26 and a jack 32, respectively. The first and second electrodes 24 and 26, respectively, are electrically insulated from each other and arranged such that the parts of the surfaces of the electrodes are exposed outside the support 22. Thus, the sensor 12 can be put into and out of a space to be concreted through an observation window 15 formed in a framework 14 and accordingly used again by drawing the sensor 12 from a concreted space.
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