TECHNIQUE FOR SEARCHING FOR MINERS UNDER CRUMP ACCOUNTING FOR ARBITRARY ANTENNA ORIENTATION

摘要

A technique for searching for miners under the crump accounting for the arbitrary antenna orientation relates to the mine safety and may be used for locating the miners under the crump. The inventive novelty consists in providing the radio beacons for all the staff of the mine. The rescue group is equipped with the appliance for activation of radio beacons and the search devices. The appliance for activation of radio beacons is the source of the alternate low-frequency magnetic field with specified frequency and output. This magnetic field is detected by the radio beacons of the miners. When the threshold level is exceeded, the low-frequency magnetic field with another frequency is actuated. This magnetic field is detected by nine fixed coils with the ferromagnetic cores of three search devices (three in each device). The output signals are amplified and rectified. The rectified signals are squared and summed in each of three search devices. The longitudinal axes of three coils in each search device are arranged in perpendicular one to another. Afterwards, the square root of the summed signal is generated. The level of the resulting signal corresponds to the received low-frequency magnetic field of the maximal value. The maximal level of the received signal is provided in any spatial position of the coil of beacon in the object of rescue. According to the nomograms prepared beforehand, the distance between each search device and the beacon is measured. When the distances between the search devices and the azimuths of the search devices themselves are known, the search device is selected, which is most optimal as the starting point for the rescue operation.