SU1122996A1 - Electrode for geoelectric prospecting - Google Patents

Abstract

ELECTRODE FOR GEOELECTRIC INDUSTRY1, made in the form of a cylindrical cup, filled with a porous electrolyte impregnated with an elastic material, is required in order to improve the measurement performance, it is equipped with at least one coaxially arranged cylindrical part in it with a cup, spring loaded and installed with the possibility of longitudinal movement.

Description

The invention relates to geophysics, in particular to devices for geoelectrical exploration at constant and low frequency currents, and can be used for geoelectric measurements in mine workings. A known electrode containing a vessel with an electrolyte, a metallic electrode, is immersed in the electrolyte, and a contact porous element connected by a jumper from a porous capillary material with an electrolyte solution y. However, in the process of measurement, it is necessary to maintain a certain spatial position of the electrode, precluding leakage of electrolyte from it, which limits the possibilities of the electrode and reduces labor productivity in geoelectrical research. Closest to the present invention is an electrode made in the form of a cylindrical cup filled with a porous electrolyte impregnated with elastic material 2. A disadvantage of the known electrode is the low measurement performance during geoelectrically studies. The decrease in the measurement performance is associated with the violation of the electrode point conditions in installations with small dimensions of the measuring and supply lines, and in the case of measurements with large installations, the contact resistance of the electrode limits the amount of current in the supply line. Parallel aefiHe pods of additional electrodes or replacement of electrodes of one size with electrodes of a different size during the measurement process reduces labor productivity. The goal of the invention is to increase the measurement performance during geological research. The goal is achieved by the fact that the electrode, made in the form of a cylindrical metal stack, filled with a porous propentan 1m electrolyte by an elastic mother, is equipped with at least one cylindrical glass coaxially arranged in it, spring-loaded 1M and installed with the possibility of longitudinal movement. The drawing shows the diagram of the electrode. The electrode consists of a cylindrical metal cup 1, inside of which a cylindrical cup 2 with a diameter of 2 is located coaxially, spring loaded with a compression spring 3 and protruding from the outer cup 1. It is advisable to use a spring conical for springing. One end of the spring is attached to the inner surface of the bottom of a large glass, and the second to the outer surface of the bottom of a small glass. By means of this spring, electrical contact between the inner cup and the outer one is ensured. A wire 4 or a measuring line of an electrical exploration installation is connected to an external glass. The cavities of the cups are filled with electrolyte-impregnated porous elastic material 5, for example, foam rubber, fixed 1 m using metal studs 6. The electrode works as follows. The electrode is placed on the surface of the outcropping of the rocks and pressed until the spring is partially compressed. In this case, electrical contact with the rock is provided through the porous material of the protruding inner cup. Ground resistance is determined by the expression i ". where p is the specific electrical resistance of the medium. Ohm; di is the diameter of the protruding compact part of the electrode, m. fifia of the change in the grounding resistance, increase the pressing force until the porous material of the outer cup contacts the rock. The grounding resistance R- will then decrease and will be equal to R 2 where d- is the diameter of the contact part of the electrode when it is fully pressed, m. All other things being equal, the ratio of grounding resistances for the electrode's different positions is determined by the reverse ratio of the contact parts Rf d P - I-.

3

Consequently, to change the grounding resistance n times, it is necessary that the diameters of the contact parts differ so much. For practical work, it is sufficient to double the grounding resistance.

The fyp ectva of the proposed electrodes lies in the fact that it makes it possible to improve the performance of measurements in geoelectric studies, for example, by the method of electrical sounding with initial small and final large sizes of the supply and measurement lines. In order to maintain the electrode point conditions, the grounding of the lines at small sizes is carried out by the protruding part of the electrode, and in order to maintain the required amount of current in the supply line at large spacings, they are grounded to the entire electrode area.

Thus, the presence of a second protruding and spring-loaded cup allows in the process of measurement. rhenium promptly resize

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the contact surface increases or decreases, and depends on the requirements, while observing the exactness of the ground.

In addition, the proposed electrode makes it possible to quickly and efficiently monitor the leakage of current from the supply line in a way that, in addition to the main measurement, a second measurement of apparent resistivity is carried out with a modified resistance of the supply electrodes. If there are current leaks, a change in the grounding resistance of the supply line causes a change in apparent resistance, as the ratio between the leakage current and the current through the supply electrodes changes.

The proposed electrode is easy to manufacture, easy to use (especially when performing geoelectric studies in mining, on quarries and the surface of rock massifs).

Claims (1)

ELECTRODE FOR GEOELECTRIC EXPLORATION, made in the form of a cylindrical cup filled with a porous elastic material impregnated with an electrolyte, with the fact that, in order to increase the measurement performance, it is equipped with at least one more coaxially located in it cylindrical cup, spring-loaded and mounted with the possibility of longitudinal movement. Underground geoelectric studies. - In the book. 1 Geophysical equipment, vol. 42. L., Nedra 1970, p. 14'3-146, figure 2 (prototype). ^ zzzzzzzzzzzzzzzzzzz * ·· ... * ^J • ύ '° * / · • _φ •. about 0. ". ‘Oh, I ABOUT · . o * · · · • “0 With • “• · · .. ° · •“. about " · "·. • ·. • ·. · · · ’’ ’* * Ή · '·· · - -. '' * ·. L o · • o ·· ^0. · ·. • · О · _f A.. Ω G ”wra ShchvyaA э ь СО со SO