FIELD: rescue operations.
SUBSTANCE: novel method of searching affected under rubble, is provision of whole personnel with mine beacons, combined with microwave sensors of cardiac rhythm and establishing of search group, which is equipped with radio beacons activation devices and search devices in amount of three pieces, one of which is equipped with indicator of state of human health. Activation device drives variable-frequency magnetic field with one frequency and set power. This variable magnetic field is caught by mine personnel radio beacon and if radio beacon exceeds certain threshold level of this field, heart rate microwave sensor is actuated and low-frequency magnetic field is excited with another frequency modulated by periodic function corresponding to contractions in human cardiac muscle. By movable coils with ferromagnetic cores of search devices that variable-frequency magnetic field is received, amplified electrical signal obtained at the output of coils and measuring its level, which corresponds to received alternating low-frequency magnetic field. By rotating moving coils with electromagnetic cores maximum readings of level meter are produced. Distance from each of search devices to radio beacon is determined by measured signal levels with help of previously captured nomogramm. At known distances between search devices and known azimuths of search devices themselves relative to each other, azimuths of beacon or search object from each of search devices are determined. Received and amplified low-frequency signal modulated by periodic function describing human heart muscle contraction is rectified simultaneously with low time constant in one of search devices. At that, state of human health is estimated and selecting these azimuth and distance to search object from that of search devices, from which salvage measures are carried out most efficiently.
EFFECT: disclosed is method of searching for injured people under debris and remote monitoring of heart rhythm, which can be used to locate personnel under/over debris in mines and simultaneous control of their health status.
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