Geozond-RCH

Surface radiowave polarimia technology of searching and prospecting underground waters


Surface radiowave polarimia technology of searching and prospecting underground waters   $9 000 (standart complectation)

Introduction

This technology is one of distant, ecologically clean, efficient and precise methods of field high-frequency electrical prospecting.

The technology includes: a GEOZOND - RCH device and a methodology of surveying and processing the readings of the device.

The device has an autonomous electric power block. It consists of a generator, a receiver with a digital registration block, antenna equipment, and a device for charging accumulators. The weight of the device with the power blocks and antennas is no more than 16 kg.

Surveying is done by the profile method (the productivity is no less than 2000 linear metre per working day in 3 stages). The other method of surveying is horizontal (the productivity is no less than 1000 linear metre per working day). Both methods of surveying can be done by two medium qualification operators. The results can be processed and interpreted by one of the operators.

The technology has been widely piloted. It can be successfully used for doing the following hydrogeological tasks:

  • prospecting and estimating the depth of underground waters' bedding, evaluating their productivity;
  • prospecting, taking geometrical parameters and evaluating the productivity of an accumulation of underground waters of lens or fissure and vein types;
  • estimating the approximate lithological contents of rocks in an aeration area, in waterbearing and waterproof layers, making maps of the elements of a waterbearing section (sinking areas in a waterproof relief, fissure areas);
  • evaluating the degree of underground waters' mineralisation.

The depth of prospecting in unsolid rocks with the specific resistance of 50-10000 O*m is up to 25-100 metre, the minuteness of surveying the section is from 0.5 m.

The results of surveying on the points of the profile are presented as a two-dimension matrix of figurative lines of spreading electrophysical or wave characteristics of the environment.

There is software for computer processing the results and simplified processing the results in an analogous way.

For some recent years the GEOZOND - RCH device has been used for solving geological, hydrogeological, geoecological, archaeological problems and problems in engineering geology. The methodology was used for prospecting underground waters in several regions in the Turkmen Republic, as well as for doing geological tasks in the layer "Rudnichnoye" in Sverdlovsk region, in east Baikal region (Sayany), in Vyazemskoye GOK and in other regions. It was also used for prospecting surplus damping areas along the Moscow Railway. In the mining areas of the enterprise "Gips-Knauf" there were found plots subject to underground waters breaks. This methodology has been applied at more than a hundred plots for prospecting waterbearing veins and lens and autonomous water supplies with the water found at the depth of 4 to 50 m.

The facts written above are not exhaustive. The list of tasks, which can be done with the help of this technology, can be widened extensively.

General information

The technology includes: a GEOZOND - RCH device and a methodology of surveying and processing the readings of the device.

The device consists of a generator, a receiver with a digital registration block, antenna equipment, and a charging device. There are several versions of the device with different frequency ranges and some construction alterations. The device has an independent electric power block for 8-hour continuous work without charging the accumulators. The weight of the device with the power block and antennas is no more than 15 kg.

The transmitter of the device can be connected with two pairs of symmetrical vibrators with their in turn commutation for measuring polarisation characteristics. The receiver can accept an additional frame antenna.
The digital registration block of the receiver provides automatic commutation of the measures, indication, memorisation, storing, observing and transmitting information in a standard interface to a personal computer.

Surveying is done by the profile method and the horizontal method or their alterations.

The results of surveying are presented as a two-dimension matrix of figurative lines of geophysical parameters in a profile or a horizontal surface at a given depth. The discreteness of the matrix depends on the required minuteness of the information and on the measuring parameters (frequency of electromagnetic oscillations, observation pace). Co-ordinates of the points in the matrix are identified horizontally by the position of the middle of the device (the distance between the geometrical centres of the receiver and transmitter antennas), and vertically by the depth h, which is calculated as the radius of the zone essential for spreading and reflecting radio waves.

The technology is defined from other classical georadar technologies by its extensive information and measuring capacities and the depth of prospecting.

Operations

The device GEOZOND-RCH is intended for generating electromagnetic fields of transversal and longitudinal polarisation and measuring the components of the electromagnetic field at different distance between the generator and the receiver and at different frequencies. It can solve the following engineering tasks:

  • prospecting areas for building constructions, roads, bridges with the aim of identifying tectonically weak places, areas of landslides and sink-holes; evaluating the stability of waterbearing grounds;
  • searching for hidden faults in hermetic liquid transporting systems;
  • monitoring geoundersurface areas subject to weakening and destruction;
  • making careful fault detection and evaluating the quality of motorways (transport highways) under construction or functioning.

Spheres of application

Prospecting while/for designing and exploiting roads, highways, underground constructions, and electrical power lines. Geological and hydrogeological prospecting.

Measuring capacities

The depth of surveying at the frequency of 1MHz is 15-20 m in unsolid rocks with the specific resistance of 50-80 O*m and the minuteness of surveying is from 0.2 m.

Specifications

  versions of the device GEOZOND
RCH RCH1 RCH2
working frequencies, MHz 0,312-1,25 1,25-9 9-62
power of the transmitter, W 8±2;1±0,2 1±0,2 0,6±0,2
sensitivity of the receiver with the relation signal/noise no less than 10 dB, no worse than, mkb 0,1 0,2 0,3
working temperature interval,°С from minus 10 to plus 40
form of processing information analogous, analogous-digital transformation, storing and reproducing information
electrical power independent
weight of the device with power blocks, without antennas, no more than, kg 12 10 8
working conditions surface, mining

Efficiency

Efficiency of the device is 5 linear km per working day with surveying done by the profile method in 2 stages. Efficiency is 0.3 linear km with surveying by horizontal method at the depth of up to 10 m and the minuteness of surveying is 1-1.5 m. The attending staff is 3 people (an engineer-interpreter, a technician-operator, and a ground worker).

Set of equipment

transmitter - 1 piece
electrical antennas of the hard construction transmitter - 1 set
electrical antennas of the soft construction transmitter - 1 set
receiver - 1 piece
electrical antennas of the hard construction receiver - 1 set
electrical antennas of the soft construction receiver - 1 set
receiving magnetic antenna - 1 piece
charging device - 1 piece
instruction manual and papers - 1 set
set of programmes for processing information - 1 set

The set of the equipment can be altered on agreement with the client.

The price of the technology is agreeable.

Contact info:
tel./fax: +7 (0872) 45-81-16, cell. +7 (910) 941-78-05, Vasiliy Kotenev
E-mail: mashgeo@tula.net briket@briket.ru

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