RU12261U1 - EQUIPMENT FOR CONTINUOUS ELECTRIC PROFILING - Google Patents

Description

EQUIPMENT FOR CONTINUOUS ELECTRIC PROFILE

The utility model relates to geophysics and is intended for conducting geophysical studies by the method of electric profiling on alternating current in motion without galvanic contact with the ground.

Known apparatus for frequency electromagnetic sounding, consisting of a generator device containing a master oscillator, a power amplifier and a power dipole, as well as a receiving device containing a signal receiver and a broadband amplifier. A frequency divider and a control circuit are connected in series between each other in a generator device between a master oscillator and a power amplifier. And in the receiving device between the signal receiver and the broadband amplifier, a preamplifier, narrow-band RC notch filters, a filter unit and a detector (AC No. 1073726, G 01 v 3/08, G 01 R 19/02) are additionally introduced in series with each other. 02/15/84, Bull. No. 6).

It is also known a device for geoelectrical exploration, containing generator and measuring circuits, which are connected in series to sequentially connected radio time correctors and a signal reset unit (AS No. 642663, G 01 V 3/10. Publ. 15.01.79, Bull. No. 2).

A disadvantage of the known apparatus and device is the presence of large errors due to the use of low (rather than high) frequency of the emitted signal in the study of the upper part of the section. v3 / 10

The symmetric AA MNB B installation with double spacing is also known, combining two four-point AMNB and A MNB installations with the same receiving ground spacing (Yakubovsky Yu.V., Lyakhov L.L. Electrical exploration. M .: Nedra, 1974, p. 160- 164).

However, this installation, due to the need for galvanic grounding of the electrodes, has low measurement accuracy, because At the same time, the influence of the surface conditions of the studied areas (the speed of the installation along the profile, climatic and weather conditions, topography, surface inhomogeneities, etc.) affects. In addition, the installation requires a lot of labor, because when working with it, a significant number of performers (at least 6 people) are necessary.

Closest to the proposed combination of features is continuous electrical profiling equipment (NEP), which contains a generator device with a working frequency generating unit, an output amplifier and two radiating antennas, a receiving and recording device with a mixer, a local oscillator and a receiving antenna included in it (Equipment continuous electrical profiling of the NEP. Passport IS 2.718.000 PS - M .: NPO Stroyizyskaniya, 1988).

But this apparatus5fa also has low measurement accuracy due to the lack of comprehensive information about the studied section.

The task to which the proposed utility model is aimed is to increase the accuracy and information content of the measurements of the secondary field by obtaining additional information about the studied section and reducing the influence of surface inhomogeneities.

To solve this problem, at least one receiving and recording device and the same number of tie rods are additionally introduced into the equipment for continuous electrical profiling (NEP), containing a generator device, a reception and recording device and a cord-pull. At the same time, the introduced reception and recording devices are connected to the generator device, respectively, by means of additional cords, rods of a given length.

The introduction of one or more receiving-register 5 units; their devices interacting with them and the generator device allows the secondary field to be measured simultaneously at different depths, eliminating the errors associated with repeated measurements (different mixing speeds; the equipment is mixed along the profile, different time measurements, possible changes in surface, climatic, weather conditions, etc.).

Additional traction cords are used to connect the input receiving and recording devices with the generator device and to fix the size of the equipment. The length of each cord-rod is selected depending on the required depth of research.

In FIG. 1 is a structural diagram of apparatus for continuous electrical profiling; FIG. 2 is a block diagram of a generator device, and FIG. 3 is a block diagram of a receiving-registering device;

The equipment for continuous electrical profiling (Fig. 1) consists of generator 1, the main receiving and recording device; its device 2, input receiving and recording devices 3, ... N and tie rods 4, 5, p.

Generator device 2 (Fig. 2), in turn, consists of a working frequency generating unit 6, a pulse amplifier 7, an antenna unit 8 and a power source 9.

And the receiving and recording devices 2, 3, N (Fig. 3) consist of each of the receiving antenna 10, the source repeater 11, the narrow-band amplifier 12, the mixer 13, the local oscillator 14, the intermediate frequency amplifier 15, the logarithmic amplifier 16, the synchronous detector 17, the recorder 18, power supply 19.

Apparatus for continuous electrical profiling works as follows.

Initially, when conducting geophysical studies, voltage is supplied to the generator 1 and receiving-registering 2, 3, N devices, respectively, from power supplies 9 and 19 (Fig. 1,2).

The working frequency generating unit 6 generates a fundamental frequency, for example, 14 kHz. The main frequency signal is supplied to a pulse amplifier 7, operating in key mode. From the amplifier 7, a high voltage of the operating frequency is transmitted to the antenna unit 8.

Thus, the generator device 1 stabilized current of a fixed frequency through the antenna unit 8 excites an electromagnetic field in the studied section of rocks.

And the receiving and recording devices 2, 3, N (Fig. 1, 3) carry out at some distances from the point of excitation, determined by the length of the non-expandable and non-conductive cord cords 4, 5, p, the selective reception of the secondary field and signal processing with a frequency of 14 kHz, induced in the receiving antenna 10 from the generator device 1.

The input signal from the receiving antenna 10 of each receiving-registering device 2, 3, N is supplied to the source repeater 11 with an attenuator (not shown), which attenuates the input signal, for example, by 3 and 10 times. Next, the signal is supplied to a narrow-band amplifier 12 tuned to a frequency of 14 kHz.

From the output of the amplifier 12, the signal is supplied to the first input of the mixer 13, the second input of which receives a signal from the local oscillator 14.

The intermediate frequency signal, for example, 500 Hz from the output of the mixer 13 is fed to the intermediate frequency amplifier 15. The amplified intermediate frequency signal is fed to the logarithmic amplifier 16, from the output of which the signal is fed simultaneously to the synchronous detector 17. From the output of the synchronous detector 17, the signal goes to the recorder 18 .

Since the excitation and reception of the electromagnetic field is carried out without galvanic contact with the ground, the measurements are carried out continuously, in the process of movement of the operators.

When moving the receiving and recording devices 2, 3, N during the movement of the operators, selective reception of the secondary field is carried out, recorded simultaneously at different depths.

By the magnitude of the secondary field strengths recorded on a logarithmic scale on the recorder’s tape 18 of each of the receiving and recording devices 2, 3, N, on the basis of the additional information received that increases the measurement accuracy, the geological structure of the object under study and the physical characteristics of its horizons are judged.

Claims (1)

The apparatus for continuous electrical profiling, containing a generator device, a receiving and recording device and a cord-pull, characterized in that it additionally introduced at least one receiving and recording device and the same number of cord-rods, while the input receiving and recording devices are connected with a generator device, respectively, by means of additional cords, rods of a given length.