CN204302509U - A kind of transient electromagnetic method multiturn small coil dipole sniffer - Google Patents

Abstract

The utility model discloses a transient electromagnetic method multi-turn small coil dipole detection device, comprising: a transmitter, a sending wire frame, a receiver and a receiving wire frame, the transmitter is connected with the sending wire frame through a signal cable, and the receiver is connected through a signal cable. The signal cable is connected to the receiving wire frame, and the transmitter and receiver are connected through a reference cable; the sending wire frame and the receiving wire frame are both multi-turn wire frames; and the sending wire frame is a rectangular wire frame, and the receiving wire frame is a circular coil. The utility model can easily obtain the induced electromotive force of the underground mine layer.

Description

A transient electromagnetic method multi-turn small coil dipole detection device

technical field

The utility model relates to the technical field of transient electromagnetic method, in particular to a multi-turn small coil dipole detection device for transient electromagnetic method.

Background technique

The transient electromagnetic method uses an ungrounded return line or a grounded line source to emit a pulsed magnetic field underground. During the interval of the first pulsed magnetic field, the coil or grounding electrode is used to observe the secondary induced eddy current field caused in the underground medium to detect the medium resistivity. Due to its unique advantages, TEM has been widely used in land geophysical exploration.

The transient electromagnetic method uses detection devices to observe the secondary induced eddy current field of the underground medium. Conventional detection devices include overlapping loops, center loops, dipole devices, large loops (large fixed source), separate loops, etc. Various detection devices have their own characteristics, among which the most commonly used in field exploration are overlapping loop and center loop detection devices. However, under certain detection conditions, due to environmental constraints, it is not suitable to use devices such as overlapping loops and center loops with a side length of hundreds of meters in the transmitting coil, and it is necessary to reduce the size of the coil or use a dipole device to complete the purpose of exploration. At present Relevant studies and available instruments are rarely reported.

Contents of the invention

In view of this, the utility model proposes a transient electromagnetic method multi-turn small coil dipole detection device, the sending wire frame and the receiving wire frame are both multi-turn wire frames.

The utility model provides a transient electromagnetic method multi-turn small coil dipole detection device, comprising: a transmitter, a sending wire frame, a receiver and a receiving wire frame, the transmitter is connected with the sending wire frame through a signal cable, and the receiver is connected with a signal cable The cable is connected to the receiving wire frame, and the transmitter and receiver are connected through a reference cable; the sending wire frame and the receiving wire frame are both multi-turn wire frames; and the sending wire frame is a rectangular wire frame, and the receiving wire frame is a circular coil.

Preferably, the side length of the sending wire frame is 2×2m, and the diameter of the receiving wire frame is 67cm.

Preferably, the number of turns of the sending wire frame is 8 turns, and the number of turns of the receiving wire frame is 64 turns.

Preferably, it also includes a power supply connected to the transmitter, and the power supply is an EP500 power supply.

The utility model also provides a transient electromagnetic method multi-turn small coil dipole detection device, including: a transmitter, a sending wire frame, a receiver and a receiving wire frame, the transmitter is connected to the sending wire frame through a signal cable, and the receiver is connected to the sending wire frame through a signal cable. The signal cable is connected to the receiving wire frame, and the transmitter and the receiver are connected through a reference cable; wherein both the sending wire frame and the receiving wire frame are multi-turn wire frames; and both the sending wire frame and the receiving wire frame are rectangular wire frames.

Preferably, the side length of the sending wireframe is 2×2m, and the side length of the receiving wireframe is 1×1m.

Preferably, the number of turns of the sending wire frame is 8 turns, and the number of turns of the receiving wire frame is 64 turns.

Beneficial effects of the present utility model: in the transient electromagnetic method dipole detection device of the present utility model, both the transmitting wire frame and the receiving wire frame are multi-turn wire frames, and by analyzing the size, number of turns, sending and receiving of the transmitting wire frame and the receiving wire frame, The reasonable setting of the distance and other parameters enables the device to easily obtain the induced electromotive force of the underground mine layer, which provides convenience for resistivity measurement. The wire frame size of the device is small, and it is suitable for exploration operations under various environmental conditions.

Description of drawings

Fig. 1 is a schematic structural diagram of a transient electromagnetic method dipole detection device of the present invention.

Fig. 2 is a specific structural schematic diagram of the transient electromagnetic method dipole detection device of the present invention.

Detailed ways

The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Based on the transient electromagnetic method, when the sending loop Tx is separated from the receiving loop Rx, the device that maintains a fixed receiving and sending distance r and moves point by point along the side line is called a magnetic dipole device. The utility model adopts a multi-turn small coil dipole device as a transient electromagnetic exploration device. Fig. 1 shows the simple structure of the transient electromagnetic method multi-turn small coil dipole detection device of the present invention, comprising: a transmitting part for transmitting a radio frequency signal underground, a receiving part and a power supply for receiving the reflected wave of the signal transmitted by the transmitting part, The receiving part is connected to the transmitting part through a reference cable, and the power supply is connected to the transmitting part.

A transmitting part such as a transmitting coil with a certain waveform current is set on the ground or in the air, so as to generate an electromagnetic field in its surrounding space, and an induced electromotive force will be generated in the underground conductive rock ore body; the receiving part, such as the receiving coil, receives the induced electromotive force, which contains After knowing the electrical characteristics of the underground medium, the structure of the underground strata can be obtained through appropriate interpretation algorithms such as one-dimensional inversion or apparent resistivity.

Fig. 2 shows the specific structure of the transient electromagnetic method dipole detection device of the present invention, including the position and direction of transmission/reception. The transmitting part is a rectangular wire frame Tx, which is connected to the transmitter; the receiving part is a circular receiving coil Rx, which is connected to the receiver, and both the transmitting part and the receiving part are multi-turn wire frames.

Specifically, the transmitting wire frame Tx and the receiving coil Rx are located above the survey line. When a survey point is measured, keep the transmitting and receiving distance constant. One measurement point, next measurement.

Utilize the multi-turn small coil dipole detection device of the utility model to detect the resistivity, and perform the following operations:

① Instrument stability test. Two repeated observations were carried out at the same point with the same parameters, and the consistency of the obtained data was compared.

②The side length, number of turns, effective area of the transmitting and receiving wire frame, the transmitting and receiving distance and the transmission frequency test. The side length of the sending wireframe will directly affect the survey depth. At the same frequency, the larger the side length of the wireframe, the deeper the detection depth. Therefore, in practice, the relevant parameters of the transmission wireframe should be determined according to the buried depth of the target layer and the regional detection experience. In a certain inspection of the utility model, the side length of the transmitting wire frame is 2×2m, with a total of 8 turns, and the receiving wire frame is 64 turns, with an effective area of 31.4m ² , meeting the survey requirements.

③The setting of the sending and receiving distance should be reasonably determined according to the detection target. When the receiving coil is located far outside the transmitting coil, the primary field it receives is very small, but inside the transmitting coil, especially near the sideline, the primary field is relatively large. In a certain detection of the utility model, the test sending and receiving distance is set to 7-8m, which meets the exploration requirements.

In one embodiment of the present invention, the power supply adopts EP500 power supply. When the power transmission line is 50Hz, the transmission frequency is 2.5, 6.25, and 25Hz. The lower the frequency, the greater the detection depth. Various combinations of experiments can be carried out before detection to determine the best parameters for data collection.

In one embodiment of the present utility model, the power supply is an external EP500 power supply, the maximum output voltage/current: 768Vpp/3App, the pulse type of the voltage output is square wave, and the pulse length can be 1 second, 2 seconds, 3 seconds and 4 seconds select in seconds.

In one embodiment of the present invention, the receiver is connected with a computer so that the collected data can be stored and further processed by the computer, and the receiving part includes a digital receiver and a receiving coil.

In an embodiment of the present invention, the following parameters are used: effective area of the receiving coil: 31.4m2; number of turns: 64 turns; diameter: 67cm; repetition frequency: 6.25Hz; off time: 260 microseconds. Transmitting coil: 2×2m; number of turns: 8 turns; transmitting current: 2.6 amps.

Above, the technical solution of the utility model has been introduced in detail in combination with specific embodiments, and the described specific embodiments are used to help understand the idea of the utility model. Derivations and modifications made by those skilled in the art on the basis of the specific embodiments of the utility model also fall within the protection scope of the utility model.

Claims (7)

1. A transient electromagnetic method multi-turn small coil dipole detection device is characterized in that, comprising: transmitter, sending wire frame, receiver and receiving wire frame, transmitter is connected with sending wire frame by signal cable, receiver The signal cable is connected to the receiving wire frame, and the transmitter and receiver are connected through a reference cable; the sending wire frame and the receiving wire frame are both multi-turn wire frames; and the sending wire frame is a rectangular wire frame, and the receiving wire frame is a circular wire frame coil. 2. The transient electromagnetic method multi-turn small coil dipole detection device as claimed in claim 1, wherein the side length of the transmitting wire frame is 2×2m, and the diameter of the receiving wire frame is 67cm. 3. The transient electromagnetic multi-turn small coil dipole detection device according to claim 2, wherein the number of turns of the transmitting wire frame is 8 turns, and the number of turns of the receiving wire frame is 64 turns. 4. Transient electromagnetic method multi-turn small coil dipole detection device as claimed in claim 1, is characterized in that, also comprises the power supply that is connected with transmitter, and described power supply is EP500 type power supply. 5. A transient electromagnetic method multi-turn small coil dipole detection device is characterized in that it comprises: a transmitter, a sending wire frame, a receiver and a receiving wire frame, the transmitter is connected with the sending wire frame by a signal cable, and the receiver The signal cable is connected to the receiving wire frame, and the transmitter and receiver are connected through a reference cable; wherein both the sending wire frame and the receiving wire frame are multi-turn wire frames; and both the sending wire frame and the receiving wire frame are rectangular wire frames. 6. The transient electromagnetic multi-turn small coil dipole detection device as claimed in claim 5, wherein the side length of the transmitting wire frame is 2×2m, and the side length of the receiving wire frame is 1×1m. 7. The transient electromagnetic multi-turn small coil dipole detection device according to claim 6, wherein the number of turns of the transmitting wire frame is 8 turns, and the number of turns of the receiving wire frame is 64 turns.