CN213023598U

CN213023598U - Transient electromagnetic instrument

Info

Publication number: CN213023598U
Application number: CN202022422171.7U
Authority: CN
Inventors: 张建智
Original assignee: Research Institute of Coal Geophysical Exploration of China National Administration of Coal Geology
Current assignee: Research Institute of Coal Geophysical Exploration of China National Administration of Coal Geology
Priority date: 2020-10-27
Filing date: 2020-10-27
Publication date: 2021-04-20
Anticipated expiration: 2030-10-27

Abstract

The utility model provides a transient electromagnetism appearance, including storage module, logic control module, transmitting module and receiving module, transmitting module includes transmitting circuit and transmitting coil, logic control module is connected with the transmitting circuit electricity, transmitting circuit is connected with the transmitting coil electricity, transmitting circuit is used for controlling the transmitting coil to transmit bipolar square wave, receiving module includes delta sigma analog-to-digital converter and receiving coil, delta sigma analog-to-digital converter is connected with logic control module electricity, receiving coil is connected with delta sigma analog-to-digital converter electricity, receiving coil is used for receiving sensing signal, and send to delta sigma analog-to-digital converter, delta sigma analog-to-digital converter is used for comparing sensing signal one by one and obtaining the digital signal that corresponds, logic control module is connected with the storage module electricity, logic control module is used for receiving digital signal, and store digital signal to storage module. The utility model discloses a delta sigma analog-to-digital converter converts the direct mode with successive comparison approximation of sensing signal to linear voltage, has improved sampling speed and precision.

Description

Transient electromagnetic instrument

Technical Field

The utility model belongs to the technical field of the electromagnetic equipment of exploration, especially, relate to a transition electromagnetism appearance.

Background

The transient electromagnetic method is often used in the geological exploration process, the transient electromagnetic method is to send a primary field to the underground by using an ungrounded or grounded line source, the primary field has the effect of enabling underground substances to generate a polarization effect, the excited underground substances can spontaneously generate a secondary field, in the process that signals of the secondary field are propagated to the ground, the signals are received and collected by a receiving coil, and the electrical characteristics, the scale size and the like of geological bodies at different underground depths can be judged according to the attenuation curve characteristics of the signals of the secondary field.

The conventional transient electromagnetic instrument mainly supports the conventional ground, well, roadway or aviation field, an electronic circuit of the transient electromagnetic instrument adopts an integrated circuit, a sampling integrator is adopted for detection, N gates and integrators are arranged in the conventional sampling integrator, the gate control circuit controls the sampling starting time and the integration time of each measuring channel, each gate is opened and closed according to a certain time sequence, and an integral value is kept on a capacitor. Because the signal of the sampling integrator is very weak, signal accumulation is a main means for improving the signal-to-noise ratio of the transient electromagnetic system, namely, sampling information of multiple periods is accumulated and kept successively, and finally, the sampling information is averaged and output. Although this method of improving the signal-to-noise ratio obtains high signal-to-noise ratio data, the sampling time is too long, which is not favorable for continuous sampling and fast sampling.

Therefore, the traditional transient electromagnetic instrument has complex signal processing steps, the processing capacity of the traditional transient electromagnetic instrument is greatly limited by the bandwidth of the sampling integrator, the defects of low sampling speed and long sampling time exist, and the traditional transient electromagnetic instrument cannot adapt to the high requirements on the detection timeliness, the detection depth and the detection precision of the urban underground space.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of above-mentioned prior art existence, provide a transition electromagnetism appearance, solved the shortcoming that sampling speed is slow among the prior art, sampling time is long, overcome the technical problem of unable quick continuous sampling.

In order to achieve the above object, the present invention provides a transient electromagnetic instrument, including a storage module, a logic control module, a transmitting module and a receiving module, wherein the transmitting module includes a transmitting circuit and a transmitting coil, the logic control module is electrically connected to the transmitting circuit, the transmitting circuit is electrically connected to the transmitting coil, the transmitting circuit is used for controlling the transmitting coil to transmit bipolar square waves, the receiving module includes a delta-sigma analog-to-digital converter and a receiving coil, the delta-sigma analog-to-digital converter is electrically connected to the logic control module, the receiving coil is electrically connected to the delta-sigma analog-to-digital converter, the receiving coil is used for receiving an induction signal and transmitting the induction signal to the delta-sigma analog-to-digital converter, the delta-sigma analog-to-digital converter is used for comparing the induction signal one by one and obtaining a corresponding digital signal, and the logic control module is electrically connected to the, the logic control module is used for receiving the digital signal and storing the digital signal to the storage module.

Furthermore, the device also comprises a transmitting voltage stabilizing circuit, wherein the transmitting voltage stabilizing circuit is electrically connected with the transmitting circuit.

Further, the transmitting voltage stabilizing circuit controls the output voltage of the transmitting circuit to be 24V.

Further, the receiving coil is electrically connected with the delta-sigma analog-to-digital converter through the signal amplifier.

Furthermore, the system also comprises a GPS synchronization circuit, and the GPS synchronization circuit realizes the clock synchronization of the transmitting module and the receiving module.

Furthermore, the intelligent control system also comprises a power module and a display control module, wherein the power module and the display control module are respectively electrically connected with the logic control module.

The utility model has the advantages that:

the utility model provides a transient electromagnetism appearance through set up delta sigma analog-to-digital converter before logic control module, directly converts the sensing signal that receiving module received to linear voltage with the mode that successive comparison approximated, need not to add up through signal many times again, can obtain the transient signal of high accuracy in a time series, has improved sampling speed and precision, realizes a quick sampling mode in succession.

Drawings

The present invention is further explained by using the drawings, but the embodiments in the drawings do not constitute any limitation to the present invention, and for those skilled in the art, other drawings can be obtained according to the following drawings without any inventive work.

Fig. 1 is a schematic diagram of a frame of a transient electromagnetic instrument provided by the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example 1:

referring to fig. 1, the present embodiment provides a transient electromagnetic instrument, which includes a storage module, a logic control module, a transmitting module, and a receiving module;

the transmitting module comprises a transmitting circuit and a transmitting coil, the logic control module is electrically connected with the transmitting circuit, the transmitting circuit is electrically connected with the transmitting coil, and the transmitting circuit is used for controlling the transmitting coil to transmit bipolar square waves;

the receiving module comprises a delta-sigma analog-to-digital converter and a receiving coil, the delta-sigma analog-to-digital converter is electrically connected with the logic control module, the receiving coil is electrically connected with the delta-sigma analog-to-digital converter, the receiving coil is used for receiving induction signals and sending the induction signals to the delta-sigma analog-to-digital converter, and the receiving coil is used for receiving induction signalsHas an effective area of 200m²The delta-sigma analog-to-digital converter is used for sequentially comparing the induction signals and obtaining corresponding digital signals;

the logic control module is electrically connected with the storage module and is used for receiving the digital signal and storing the digital signal to the storage module; additionally, the logic control module is also electrically connected with a power module, and the power module provides power for the logic control module.

It should be noted that, the logic control module adopts a form of a single chip microcomputer to control the output voltage of the transmitting circuit, and make the transmitting coil transmit bipolar square waves, then utilize the receiving coil to receive the sensing signal, and after the processing of the Δ Σ analog-to-digital converter, the sensing signal is successively compared to obtain the corresponding digital signal, wherein the Δ Σ analog-to-digital converter transfers most of the conversion process to the digital domain, its analog component adopts a single comparator, an integrator and a 1-bit DAC, because the 1-bit DAC has only two outputs, it is linearized in the whole voltage range, this high-level linearization is one of the reasons for the Δ Σ analog-to-digital converter to realize high accuracy, the Δ Σ analog-to-digital converter is adopted to generate the comparison voltage one by one and perform analog-to-digital conversion in a gradual approximation manner, a high-quality transient signal can be obtained within a time sequence, and no signal accumulation is, and a continuous and quick sampling mode is realized, and finally the logic control module stores the digital signals to the storage module.

In this embodiment, the power supply further comprises a transmitting voltage stabilizing circuit, wherein the transmitting voltage stabilizing circuit is electrically connected to the transmitting circuit, the transmitting voltage stabilizing circuit controls the output voltage of the transmitting circuit to be 24V, the maximum current does not exceed 10A, and the power supply transmits an editable time sequence.

In this embodiment, the receiving coil is electrically connected to the Δ Σ analog-to-digital converter through the signal amplifier, and when an instantaneous field is observed, the signal amplifier amplifies an induction signal of the receiving coil, so that the induction signal is greater than system noise, and the accuracy of the induction signal is ensured.

Additionally, the transmitting module and the receiving module can realize signal synchronization by at least one of quartz clock synchronization, cable synchronization and GPS synchronization; in this embodiment, the clock synchronization of the transmitting module and the receiving module is realized through the GPS synchronization circuit, and the GPS synchronization circuit is electrically connected to the logic control module, so that the transmitting module and the receiving module perform continuous sampling, thereby realizing the synchronization of transmitting and receiving, improving the detection transverse resolution through real-time accurate positioning, and achieving a good sampling effect.

In this embodiment, still include the display control module, the display control module with the logic control module electricity is connected, and the operator sees the concrete information of sampling through the display control module, and the display control module carries out real-time display to on-the-spot measurement information, makes things convenient for the operator to monitor, still can issue control command through the display control module.

Compared with the prior art, the utility model provides a transient electromagnetism appearance through set up delta sigma analog-to-digital converter before logic control module, converts the sensing signal that receiving module received directly to linear voltage with the mode that successive comparison approximated, need not to add up through signal many times again, can obtain the transient signal of high accuracy in a time series, has improved sampling speed and precision, realizes a quick sampling mode in succession.

Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, but only to the preferred embodiments of the invention, and is not limited to the embodiments, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims

1. A transient electromagnetic instrument is characterized by comprising a storage module, a logic control module, a transmitting module and a receiving module, wherein the transmitting module comprises a transmitting circuit and a transmitting coil, the logic control module is electrically connected with the transmitting circuit, the transmitting circuit is electrically connected with the transmitting coil, the transmitting circuit is used for controlling the transmitting coil to transmit bipolar square waves, the receiving module comprises a delta-sigma analog-to-digital converter and a receiving coil, the delta-sigma analog-to-digital converter is electrically connected with the logic control module, the receiving coil is electrically connected with the delta-sigma analog-to-digital converter, the receiving coil is used for receiving induction signals and sending the induction signals to the delta-sigma analog-to-digital converter, the delta-sigma analog-to-digital converter is used for comparing the induction signals and obtaining corresponding digital signals, and the logic control module is electrically connected with the storage module, the logic control module is used for receiving the digital signal and storing the digital signal to the storage module.

2. The transient electromagnetic instrument of claim 1, further comprising a transmit voltage regulator circuit, said transmit voltage regulator circuit being electrically connected to said transmit circuit.

3. The transient electromagnetic instrument of claim 2, wherein said transmitting voltage regulator circuit controls said transmitting circuit to have an output voltage of 24V.

4. The transient electromagnetic instrument of claim 2, further comprising a signal amplifier, said receive coil being electrically connected to said Δ Σ analog to digital converter through said signal amplifier.

5. The transient electromagnetic instrument of any one of claims 1 to 4, further comprising a GPS synchronization circuit, said GPS synchronization circuit enabling clock synchronization of said transmitting module and said receiving module.

6. The transient electromagnetic instrument of claim 5, further comprising a power module and a display control module, wherein said power module and said display control module are electrically connected to said logic control module, respectively.