AID RECORDING ELECTROMAGNETIC RADIATION ORIGINATED BY CRACKING OF ROCKS Russian patent published in 2000 - IPC

FIELD: mining industry, monitoring of destruction of sections of rock mass with change of their stress-deformed state. SUBSTANCE: invention can also be employed to register electromagnetic radiation of samples of rocks in laboratories. Proposed aid has ferrite toroidal core with winding and metal screen surrounding it. Ferrite toroidal core is open and piece of solid dielectric carrying additional winding wound in opposition to winding of ferrite toroidal core and connected in series with it is placed in cut-out of ferrite toroidal core. Pitch of additional winding is variable, lesser to edges, and relation of part of additional winding with greater pitch to its parts with lesser pitch lies within limits of 1,5 ≤ ϕ/γ ≤ 2,5 where ϕ is angle read on both sides of horizontal axis of cut-out to start of additional winding with lesser pitch; γ is angle read from start of additional winding with lesser pitch to end faces of core. EFFECT: enhanced sensitivity of aid thanks to concentration of field in measurement space. 1 cl, 1 dwg