RU2054795C1 - Electromagnetic radiation generator - Google Patents

Abstract

FIELD: magnetic prospecting of mineral deposit. SUBSTANCE: electromagnetic radiation generator has pulsed power supply in the form of explosive-wire magnetic generator, and sectionalized inductive turn. Peripheral portions of each section of inductive turn are built up of one or more exploding wires; pulsed capacitors are connected in parallel with exploding wires. EFFECT: improved stability and power capacity, extended frequency range of generator. 5 dwg

Description

 The invention relates to devices for producing heavy-duty electromagnetic radiation (EMP) and can be used for magnetic exploration of minerals.

A device for creating a pulsed magnetic field in a large volume, containing an explosive magnetic generator and a sectioned inductive coil. The sections of the inductive coil are connected in series with the explosive magnetic generator (VMG) and in parallel to each other. The VMG has an explosive charge (explosive) located in a metal pipe around which a spiral inductor is placed. When a capacitor bank power source is discharged to a spiral inductor and detonation of the explosive charge at one end (beginning) of the tube, the latter expands in such a way that it gradually comes into contact and displays the coils of the spiral coil. The VMG electrical circuit is gradually shorted (its inductance decreases), and the magnetic flux trapped by the VMG coil is displaced into separate sections of the inductive coil sector with a corresponding increase in current and magnetic energy. As a result, a pulsed magnetic field with an induction B _{z of} 100 T and an energy of E _m 10 MJ is created inside the inductive coil with a radius of R 20 m, the number of sectors of the sectors m 30 and the resulting inductance L _in L _о / 30194/30 0.21 μH.

The disadvantage of this explosive device is the low frequency spectrum of the magnetic field f ≅ 10 kHz, due to the long time of the VMG t _p ≈250 μs.

 The purpose of the invention is the expansion of the scope of the generator by increasing the stability and power of electromagnetic radiation and expanding its frequency range.

 Figure 1 shows a circuit diagram of an electromagnetic radiation generator (EMP) with a peripheral arrangement of exploding wires and capacitors and with an explosive generator as a pulsed power source; figure 2 and 3 shows an example of an EMP generator with a radial arrangement of exploding wires and capacitors and the design of one section of the inductive coil, respectively; 4 and 5, the calculated waveforms of the current in the sections of the inductive coil before the explosion and after the explosion of the wires when using an explosive magnetic generator as a pulse power source.

 The electromagnetic radiation generator contains a series-connected switching power supply 1 and a sectioned inductive coil 2 with a destructible conductor 3 in each section. In addition, at least one capacitor 4, connected in parallel with the destructible conductor 3, is additionally introduced into each section of the inductive coil 2.

 The sections of the inductive coil 2 are connected in parallel to each other and distributed on a plane like a clover leaf type antenna.

 Destructible conductors 3 exploding under the influence of electric current, copper or aluminum wires are installed on the periphery or along the radii (figure 2) of each section of the inductive coil 2.

 The switching power supply is an explosive magnetic current generator or a pulse voltage generator (GIN) Arkadyev-Marx. When using a VMG, it is located in the center or along the axis of the inductive coil and its outer cylindrical spiral is connected using high-voltage coaxial cables to the beginning of the sections of the inductive coil, and the central pipe with the ends of the sections of the inductive coil. When using the Arkadyev-Marx GIN, characterized by a faster output of energy and a higher voltage in the discharge, the inductive coil rises above the ground and moves away from the GIN.

где t время протекания тока по проволочке до ее взрыва;
I_с ток в секции индуктивного витка;
I_пр. предельный интеграл тока, соответствующий переходу материала проволочки в парообразное состояние и равный для меди 1,95·10¹⁷А²·c·м^-4, для алюминия 1,09·10¹⁷ А²·с·м^-4.The number of exploding wires n _CR in each section of the inductive coil and their cross section S _CR are selected from the relation
n $\genfrac{}{}{0ex}{}{\text{2}}{\text{etc}}$ • S $\genfrac{}{}{0ex}{}{\text{2}}{\text{etc.}}$ =

where t is the current flow through the wire before it explodes;
I _c current in the inductive coil section;
I _pr. Limit current integral corresponding to the transition of the wire material to a vapor state and equal to 1.95 · 10 ¹⁷ A ² · s · m ^-4 for copper, 1.09 · 10 ¹⁷ A ² · s · m ^-4 for aluminum.

и

, где L_с и I_с индуктивность и ток секции индуктивного витка;
ω частота электромагнитного излучения.Capacitors 4 can be connected to each other in series, in parallel or in series-in parallel. When the capacitors are connected in series, their number n _k , the capacitance of a separate capacitor C ₁ and the voltage at a separate capacitor in each section of the inductive coil are selected from two conditions

and

where L _c and I _c inductance and current sections of the inductive coil;
ω frequency of electromagnetic radiation.

 The EMP generator operates as follows.

 First, a capacitor bank is connected to a series circuit formed by an explosive magnetic generator 1 and an inductive coil 2. A current begins to flow in the circuit and the initial magnetic flux accumulates. Then, at the moment of maximum supply current, a blasting explosive is blown up using an electric detonator. Under the influence of the pressure of the explosion products, the central pipe of the VMG expands (takes the form of a cone) and connects to the beginning of the outer cylindrical spiral. As the central pipe continues to expand, the point of contact of the pipe with the spiral moves along the latter, decreasing its inductance, compressing the magnetic flux and forcing it into a sectioned inductive coil. Moreover, in accordance with the law of conservation of magnetic flux, the current and magnetic energy in the inductive coil increase many times in comparison with the current and the energizing energy of the VMG (Fig. 4). Shortly before the end of the VMG operation, the integral of the current flowing through the thin radial or peripheral wires 3 of each section of the inductive coil is compared with the evaporation integral and the thin wires 3 explode.

 The high resistance of the exploded wires 3 causes the electric currents of the sections of the inductive coil to switch to the parallel chains of pulse capacitors 4 and the process of charging pulse capacitors of converting the energy of the magnetic field of the sections of the coil into the energy of the electric field of the capacitors begins.

, длительность колебаний τ L_c/(R_c i_г/m_c), где L_c, C_c и R_с индуктивность, емкость и активное сопротивление секции витка; i_г отрицательное генераторное сопротивление ВМГ на финишной стадии его работы; m_c число секций индуктивного витка.Since the EMR generator circuit remains shorted (the VMG central tube continues to contact the external spiral, and the exploded wires are shunted by chains of capacitors), then there is a periodic exchange of energy between the chains of capacitors and the inductances of the coil sections. The current in the sections of the inductive coil becomes almost sinusoidal (figure 5). The angular frequency of oscillations of the electric current in sections of the inductive coil ω 1 /

, the oscillation duration is τ L _c / (R _c i _g / m _c ), where L _c , C _c and R _{с are the} inductance, capacitance and resistance of the coil section; i _g negative generator resistance of the VMG at the final stage of its operation; m _{c the} number of sections of the inductive coil.

sin θ•

H_θ E_Φ/377 где I_с и U_с ток и напряжение в секции индуктивного витка;
а радиус индуктивного витка;
μ_о магнитная проницаемость воздуха;
ω₁ K ω/c и λ 2 π c / ω круговая частота, волновое число и длина волны электромагнитного поля;
С скорость света;
Z, r расстояние от центра индуктивного витка до точки наблюдения поля;
θ угол между осью витка и направлением в точку наблюдения поля.The specified high-frequency current flowing along the periphery of the inductive coil creates a vertical magnetic field with a strength of H _z ≠ I _c · a ² / (a ² + Z ² ) ^3/2 on the axis of the coil, and an azimuthal electric field of strength E _Φ m _c along the perimeter of the coil U _c / (2 π a). Far from the turn (in the wave zone r> 5 λ), the electromagnetic field is determined by the expressions
E

sin θ •

H _θ E _Φ / 377 where I _s and U _s current and voltage in the inductive coil section;
and the radius of the inductive coil;
μ _о magnetic permeability of air;
ω ₁ K ω / c and λ 2 π c / ω circular frequency, wave number and wavelength of the electromagnetic field;
With the speed of light;
Z, r is the distance from the center of the inductive coil to the field observation point;
θ is the angle between the axis of the turn and the direction to the observation point of the field.

Claims (1)

 ELECTROMAGNETIC RADIATION GENERATOR, comprising a serially connected switching power supply and a sectioned inductive coil, characterized in that, in order to expand the scope of the generator by increasing the stability of the electromagnetic radiation power and expanding its frequency range, each section of the inductive coil contains an electrically destructible conductor and at least one capacitor connected in parallel with an electrically destructible conductor.

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