RU2328021C2 - Radio-wave device for geophysical research - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention concerns geophysical instruments applying radio-wave research principles, and can be applied at exploration of basement beds of existing buildings and facilities, at construction and maintenance of economic facilities in restricted visibility conditions (fog, dusk), at exploration works in forests, drafts and other landscape unevenness. The device includes transmitting antenna and radio wave transmitter fixed at one stand, receiving antenna, radio wave receiver and spatial orientation antenna (SOA) fixed at another stand, antenna position adjustment device, and SOA signal meter.

EFFECT: enables research of soil bodies without direct contact between transmitting and receiving antennas.

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Description

The invention relates to geophysical instrumentation using the radio wave research principle.

A device for searching and determining the heterogeneity of soil massifs containing a transmitter and a receiver with antennas placed on tripods with the spatial orientation of the antennas by the visualization method (DEMP-3) [Veliev A.V. and other electromagnetic profiling. DEMP-3 device for searching tectonic disturbances. - L .: Subsoil. 1971. p.215].

The disadvantage of this device, using the eye-marking method of orientation by labels, is the lack of accuracy of the results due to significant subjective errors and the difficulty of working at long distances.

Closest to the proposed technical solution is a device for searching and determining the boundaries of tectonic disturbances in the development of coal deposits according to copyright certificate SU No. 1721242, Е21С 41/18, 39/00 dated 03/23/1992, bull. No. 11 is a prototype containing a transmitting loop antenna connected to the first sighting tube and a radio wave transmitter mounted on the first tripod, a receiving loop antenna connected to the second sighting tube and the radio wave receiver mounted on the second tripod, a device for adjusting the position of these antennas.

The disadvantage of this device is the inability to align the antennas in the absence of direct visibility, has significant limitations when working on rough terrain and noticeable elevations, significant distances between the antennas.

The objective of the invention is to provide the possibility of conducting geophysical studies by the radio wave method in any terrain, in particular, in the absence of direct visibility between the generator and receiver antennas.

The technical result is achieved by the fact that in the device for geophysical exploration by the radio wave method, comprising a transmitting loop antenna, a radio wave transmitter mounted on a first tripod, a receiving loop antenna, a radio wave receiver mounted on a second tripod, antenna position adjustment devices, an additional spatial orientation antenna is introduced ( APO) installed orthogonally to the receiving antenna and the APO signal meter.

Figure 1 presents a General view of the device, figure 2 - radiation patterns of the transmitting antenna and the APO.

A device for geophysical exploration by the radio wave method includes a transmitting antenna 1, a radio wave transmitter 2 mounted on a tripod 3, a receiving antenna 4, a radio wave receiver 5, and a spatial orientation antenna 6 mounted on a tripod 7.

The proposed device operates as follows.

A transmitting loop antenna with a radio wave transmitter mounted on a first tripod is placed on one side of an obstruction that limits visibility. A receiving loop antenna with a radio wave receiver, rigidly fastened at an angle of 90 ° with the APO, mounted on a second tripod, is placed on the other side of the obstacle. Operators, using communication tools, orient the antennas until the maximum signal of the APO meter is reached, which is observed when the planes of the antenna of the transmitter 1 and the APO 6 coincide (Fig. 2). In this case, the signal transmitted through the air from the transmitter to the receiver is minimal, and the receiving signal is determined by the secondary field induced in the ground. In this position, the signal is recorded from the receiving antenna. The signal of the APO meter reaches its maximum when the planes of the transmitting antenna and the APO coincide, since the radiation patterns of antennas with vertical polarization have the form of intersecting eights (Zaderigolova M.M. Radio wave method in engineering geology and geoecology. M.: Moscow State University. 1998. 320 s ., Fig. 2.10a) and the overlapping areas of magnetic whitefish lines in this case are the largest (in Fig. 2a it is shown by brickwork). If the orientation of the given antennas does not coincide in the vertical and horizontal planes (Fig. 2b, 2c), the signal at the output of the antenna is reduced.

An advantage of the present invention is that it is possible to study soil massifs on the surface of which there are natural or man-made barriers.

The invention can be used in the study of the foundations of the foundations of existing buildings and structures, in the construction and operation of economic facilities in conditions of limited visibility (fog, twilight), studies in forests, ravines, and other irregularities.

Claims (1)

A device for geophysical exploration by the radio wave method, comprising a transmitting loop antenna, a radio wave transmitter mounted on a first tripod, a receiving loop antenna, a radio wave receiver mounted on a second tripod, antenna position adjusting devices, characterized in that a spatial orientation antenna is additionally introduced into the device (APO ), mounted orthogonally to the receiving antenna, and the APO signal meter.

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