| 摘要 |
<p>PURPOSE:To make an excellent survey with high voltage detection sensitivity and a deep-layer survey with a widened electrode interval by specifying the frequency of a sent current which is supplied from a constant current source. CONSTITUTION:An electrode array 14 for resistivity measurement which consists of plural electrodes 12 is fitted on the surface of a sensor main body so that the electrodes 12 are exposed. When one specific adjacent couple of electrodes are used as current transmitting electrodes 12A, an AC power source 18 which supplies the constant sent current of 240 - 1200 Hz in transmission frequency is connected to the electrodes and the current is sent into the ground. When another couple of electrodes whose combination can be changed by a relay box are used as voltage detection electrodes 12B, a signal processor 24 which inputs detection data is connected to them. Then the specific resistivity of the buried body and in its peripheral ground is measured by the electrodes 12B to measure a deep layer part while the reception sensitivity is improved and the supply current value is made large.</p> |
