Abstract: A measuring tool for collecting down hole information, which essentially has a sensor sub including plural data collecting sensors secured at a forward portion of a drilling pipe and a sonde movable in the drilling pipe. Both the sensor sub and sonde employ a set of loop antennas to effect radiocommunication between them to thereby certainly send data detected by means of the sensors to the sonde.

Abstract: A bottom-hole information collecting equipment to collect data at the bottom part of the shaft in real time by the sonde throughout an excavation by the bit for digging. The sonde is provided to be mechanically and electronically connected to or separated from the connecting pipe to which the bite is attached arbitrarily. Data collected by several sensors near the bit is transmitted to the sonde via the electromagnetic coupler. The electricity for the sensors and the sonde can be obtained by respective generators of which one is in the sonde and the other is in the connecting pipe.