Geomagnetic detection method and system based on guiding device

Abstract

The geomagnetic detection method based on the guide device comprises the following steps: arranging the guide device with a set specification at any position of a detection area where a detection target is located; the guide device comprises a shell and a guide probe arranged in the shell, and the guide probe is adjusted to adjust the spread angle of a reflection signal formed by the detection signal; detection signals with different object frequency characteristics are sent to a detection target through an electromagnetic wave emitter, the detection signals are guided downwards under the guidance of a guiding device, and the natural magnetic field form changes in the guiding process, so that the detection signals change along with the change of the natural magnetic field form; when the detection signal is in contact with the detection target, a reflection signal is formed, the initial position of the received reflection signal is recorded, and the reflection signal is reflected according to a set first spread angle when the guide probe encounters the detection target; the detection target is recognized by recognizing the object frequency characteristics of the reflected signals, and the depth of the detection target is obtained through the detection position and the spread angle.

Description

Technical Field

[0001] The present invention relates to the field of geomagnetic detection technology, and in particular to a geomagnetic detection method and system based on a guidance device. Background Art

[0002] Traditional detection technologies, such as pipeline, groundwater, underground pipe piles and cast-in-place pile detection, generally use radar detection and Gaussmeter probe detection. Radar detection is easily affected by external interference, making it difficult to achieve the detection accuracy required. Radar detection is affected by the detection depth and cannot complete the detection of detection targets at a certain depth. Gaussmeter probe detection is generally used in the detection of cast-in-place piles. However, Gaussmeter probe detection requires drilling detection holes on the side of the cast-in-place pile to install the Gaussmeter probe. The Gaussmeter probe is only useful for the detection of the cast-in-place pile body. Since the relative distance between the steel bars in the cast-in-place pile is small, the Gaussmeter probe detects from one side of the pile body to the inside. Multiple steel bars are prone to cause signal interference, which has a large error interference in the detection of steel bars in the cast-in-place pile.

[0003] In addition, in traditional technologies, drilling detection is used to detect geological structures and water surfaces at different depths. This method is time-consuming and labor-intensive, and is not conducive to the use of geological exploration. Summary of the invention

[0004] In order to solve the problems of the prior art, the present invention provides a geomagnetic detection method and system based on a guidance device.

[0005] Its main technical solutions are as follows: The present invention provides a geomagnetic detection method based on a guidance device, comprising the following steps: 1) Arranging a guiding device of set specifications at any position of the detection area where the detection target is located; wherein the guiding device comprises a housing, a guiding probe arranged inside the housing, and adjusting the guiding probe to adjust the diffusion angle of the reflected signal formed by the detection signal; 2) Sending detection signals with different object frequency characteristics to the detection target through the electromagnetic wave transmitter, and guiding the detection signal downward under the guidance of the guiding device. During the guiding process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; 3) When the detection signal contacts the detection target, a reflection signal is formed, and the initial position where the reflection signal is received is recorded, and the reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target; 4) adjusting the guiding probe with reference to the initial position and the first diffusion angle of the reflected signal, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches the set requirement, and marking the position where the reflected signal is received when the diffusion angle of the reflected signal reaches the set requirement as the detection position; 5) Identify the detection target by identifying the object frequency characteristics of the reflected signal, and obtain the depth of the detection target through the detection position and diffusion angle.

[0006] Furthermore, under the guidance of the guiding device, the natural magnetic field forms a magnetic field funnel around the guiding device.

[0007] Further, the guide probe is used for: Direct the natural magnetic field downward and guide the natural magnetic field to change its shape (I); The diffusion angle (II) of the reflected signal formed after contacting the detection target is changed by adjusting the guide probe.

[0008] Furthermore, the guide probe is an electromagnetic coil, and the diffusion angle of the reflected signal formed after contacting the detection target is changed by adjusting the diameter of the electromagnetic coil, wherein the diffusion angle of the reflected signal is set to 45° by adjusting the diameter of the electromagnetic coil.

[0009] Furthermore, the material frequency characteristic refers to the inherent electromagnetic wave resonance frequency possessed by different materials.

[0010] Furthermore, when the detection signal contacts the detection target, a horizontal interface formed at the position of the detection target is used as a reflection interface.

[0011] Furthermore, the diffusion angle uses a reflection interface as a diffusion interface, and the diffusion angle is conical.

[0012] The present application also provides a geomagnetic detection system based on a guidance device, which is applied to the geomagnetic detection method based on a guidance device described above, and is characterized by comprising: A guiding device, the guiding device comprising a housing and a guiding probe disposed inside the housing, the guiding probe being used to: guide the natural magnetic field downward and guide the natural magnetic field to change its form (I); and change the diffusion angle of the reflected signal formed after contacting the detection target by adjusting the guiding probe (II); An electromagnetic wave transceiver, comprising at least an electromagnetic wave transmitter, an electromagnetic wave receiver and a processor; The electromagnetic wave transmitter is used to send detection signals with different object frequency characteristics to the detection target, and the detection signal is guided downward under the guidance of the guiding device. During the guidance process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; The electromagnetic wave receiver is used to receive the reflection signal formed after the detection signal contacts the detection target, and record the position data and diffusion angle data of the received reflection signal; A processor is connected to the electromagnetic wave receiver, receives the reflection signal, the position data and the diffusion angle data, performs spectrum analysis on the reflection signal to obtain the object frequency characteristics corresponding to the reflection signal, identifies the detection target according to the object frequency characteristics; and obtains the depth of the detection target according to a calculation program set in the processor.

[0013] Furthermore, the processor is provided with an object-frequency feature recognition library, and the detection target is identified by calling the object-frequency feature recognition library.

[0014] Furthermore, the computing program is embedded in the processor.

[0015] The present application introduces a guiding device, which can guide the natural magnetic field around the detection target downward and guide the natural magnetic field to change its shape. Specifically, the natural magnetic field is guided downward to converge to form a magnetic field funnel, so that the natural magnetic field has an energy-gathering effect. On the one hand, the natural magnetic field is converged downward to reduce interference on the surrounding side; on the other hand, the energy-gathering effect of the natural magnetic field increases the depth of detection.

[0016] The present application changes the diffusion angle of the reflected signal formed after contacting the detection target through the diameter of the electromagnetic coil, so that the detection depth can be obtained by measuring the diffusion angle and the specific position of receiving the reflected signal.

[0017] In the present application, different detection targets have different physical frequency characteristics, and the transmitted signal reflects the physical frequency characteristics of the detection target, and the detection target can be identified through the physical frequency characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 is a flow chart of the method provided by the present invention; Figure 2 It is a model diagram for calculating the depth of a detected target provided by the present invention; Figure 3 It is a model diagram of the detection of the cast-in-place pile provided by the present invention; Figure 4 It is a model diagram for detecting different groundwater levels provided by the present invention; Figure 5 It is a model diagram for detecting the stratum structure provided by the present invention. DETAILED DESCRIPTION

[0020] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] The principle of this application is that the guiding device guides the electromagnetic field vertically downward, gathers the electromagnetic waves of the natural magnetic field and propagates downward, and the shape of the magnetic field changes. The natural magnetic field is horizontal without interference. After being placed in the guiding device, the earth's magnetic field forms a magnetic field funnel around the guiding device, forming an energy-gathering effect.

[0022] The electromagnetic waves of the natural magnetic field are reflected when encountering different substances, reflecting the electromagnetic waves with the material frequency characteristics unique to the substance, and the reflected shape is cone-shaped. Therefore, in the natural magnetic field, only the electromagnetic waves that are consistent with the material frequency characteristics of the detection target are reflected when encountering the detection target. Based on this principle, it is only necessary to perform spectrum analysis on the received transmission signal, obtain its corresponding spectrum information, and obtain the corresponding resonance frequency of the electromagnetic wave, so as to know what kind of material the detection target is. And through the reflection angle and the corresponding detection data, the depth of the detection target can be calculated.

[0023] Reference Figure 1 Based on the above principle, the present invention provides a geomagnetic detection method based on a guiding device, comprising the following steps: 1) Arranging a guiding device of set specifications at any position of the detection area where the detection target is located; wherein the guiding device comprises a housing, a guiding probe arranged inside the housing, and adjusting the guiding probe to adjust the diffusion angle of the reflected signal formed by the detection signal; 2) Sending detection signals with different object frequency characteristics to the detection target through the electromagnetic wave transmitter, and guiding the detection signal downward under the guidance of the guiding device. During the guiding process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; 3) When the detection signal contacts the detection target, a reflection signal is formed, and the initial position where the reflection signal is received is recorded, and the reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target; 4) adjusting the guiding probe with reference to the initial position and the first diffusion angle of the reflected signal, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches the set requirement, and marking the position where the reflected signal is received when the diffusion angle of the reflected signal reaches the set requirement as the detection position; 5) Identify the detection target by identifying the object frequency characteristics of the reflected signal, and obtain the depth of the detection target through the detection position and diffusion angle.

[0024] Furthermore, under the guidance of the guiding device, the natural magnetic field forms a magnetic field funnel around the guiding device.

[0025] Further, the guide probe is used for: Direct the natural magnetic field downward and guide the natural magnetic field to change its shape (I); The diffusion angle (II) of the reflected signal formed after contacting the detection target is changed by adjusting the guide probe.

[0026] Furthermore, the guide probe is an electromagnetic coil, and the diffusion angle of the reflected signal formed after contacting the detection target is changed by adjusting the diameter of the electromagnetic coil, wherein the diffusion angle of the reflected signal is set to 45° by adjusting the diameter of the electromagnetic coil.

[0027] Furthermore, the material frequency characteristic refers to the inherent electromagnetic wave resonance frequency possessed by different materials.

[0028] Furthermore, when the detection signal contacts the detection target, a horizontal interface formed at the position of the detection target is used as a reflection interface.

[0029] Furthermore, the diffusion angle uses a reflection interface as a diffusion interface, and the diffusion angle is conical.

[0030] The present application also provides a geomagnetic detection system based on a guidance device, which is applied to the geomagnetic detection method based on a guidance device described above, and is characterized by comprising: A guiding device, the guiding device comprising a housing and a guiding probe disposed inside the housing, the guiding probe being used to: guide the natural magnetic field downward and guide the natural magnetic field to change its form (I); and change the diffusion angle of the reflected signal formed after contacting the detection target by adjusting the guiding probe (II); An electromagnetic wave transceiver, comprising at least an electromagnetic wave transmitter, an electromagnetic wave receiver and a processor; The electromagnetic wave transmitter is used to send detection signals with different object frequency characteristics to the detection target, and the detection signal is guided downward under the guidance of the guiding device. During the guidance process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; The electromagnetic wave receiver is used to receive the reflection signal formed after the detection signal contacts the detection target, and record the position data and diffusion angle data of the received reflection signal; A processor is connected to the electromagnetic wave receiver, receives the reflection signal, the position data and the diffusion angle data, performs spectrum analysis on the reflection signal to obtain the object frequency characteristics corresponding to the reflection signal, identifies the detection target according to the object frequency characteristics; and obtains the depth of the detection target according to a calculation program set in the processor.

[0031] Furthermore, the processor is provided with an object frequency feature recognition library, and the detection target is identified by calling the object frequency feature recognition library; the object frequency feature refers to the fixed electromagnetic wave resonance frequency of the object. For example, the inherent electromagnetic wave resonance frequency of iron is 16000-17000Hz, the inherent electromagnetic wave resonance frequency of plastic pipes is 730-760Hz, the inherent electromagnetic wave resonance frequency of steel bars is 16500-17000Hz, the inherent electromagnetic wave resonance frequency of copper is 11500-12000Hz, the inherent electromagnetic wave resonance frequency of cement is 750-850Hz, and the inherent electromagnetic wave resonance frequency of water is 10000 Hz. The inherent electromagnetic wave resonance frequencies of different substances can be measured by instruments.

[0032] Furthermore, the computing program is embedded in the processor.

[0033] The present application introduces a guiding device, which can guide the natural magnetic field around the detection target downward and guide the natural magnetic field to change its shape. Specifically, the natural magnetic field is guided downward to converge to form a magnetic field funnel, so that the natural magnetic field has an energy-gathering effect. On the one hand, the natural magnetic field is converged downward to reduce interference on the surrounding side; on the other hand, the energy-gathering effect of the natural magnetic field increases the depth of detection.

[0034] The present application changes the diffusion angle of the reflected signal formed after contacting the detection target by the length and diameter of the electromagnetic coil, so that the detection depth can be obtained by measuring the diffusion angle and the specific position of receiving the reflected signal. Figure 2 When the diffusion angle is set to 45°, according to the principle that the two right-angled sides of an isosceles right triangle are equal, the specific position of the detection target can be measured by simply measuring the distance between the receiving point of the transmitted signal and the guiding device.

[0035] In the present application, different detection targets have different physical frequency characteristics, and the transmitted signal reflects the physical frequency characteristics of the detection target, and the detection target can be identified through the physical frequency characteristics.

[0036] Based on the above technical solution, the present application is specifically described with embodiments.

[0037] Example 1, detection of cast-in-place piles: Reference Figure 3Since the detection is performed based on the physical frequency characteristics of concrete, it has nothing to do with the age and elastic modulus of concrete. In theory, unsolidified concrete can also be detected. Therefore, based on the above technical solution, the detection signal corresponding to the physical frequency characteristics of concrete is guided downward under the guidance of the guiding device. After the detection signal contacts the detection target, the horizontal interface where the detection target is located is used as the reflection interface to form a reflection signal, and the position data and diffusion angle data of the received reflection signal are recorded. The length of the pile body can be obtained through the position data and diffusion angle data; If the pile body is broken, a material frequency characteristic different from that of concrete is formed at the broken pile. At this time, the horizontal interface where the broken pile is located can be used as a reflection interface. Therefore, this application is also applicable to broken pile detection. By adopting the same idea as the principle of the pile body, the length and broken steel bars in the pile body can also be detected. It is only necessary to select a suitable guiding device so that the detection signal consistent with the material frequency characteristics of the steel bar converges downward around the detected steel bar and forms a specific magnetic field funnel, so as to complete the detection of the steel bar length and the broken steel bar.

[0038] Based on the above method, for multiple bored piles in the same area, since the guiding device is used to make the natural magnetic field converge and enrich downward, it also has an enrichment effect and a consistent radiation angle on the electromagnetic waves in the natural magnetic field. Therefore, when the guiding device is placed directly above the bored pile, a directional detection of the bored pile will be formed, and there will be no mutual electromagnetic interference between single piles, thus solving the problem of mutual radiation interference between the pile bodies.

[0039] Example 2: Detection of groundwater level without holes: Reference Figure 4 In the present application, the horizontal interface where the detection target is located is used as the reflection interface to form a reflection signal. Therefore, water levels at different depths have different horizontal interfaces. The detection signal corresponding to the physical frequency characteristics of water is guided downward under the guidance of the guiding device. After the detection signal contacts the water surface, the horizontal interface where the water surface is located is used as the reflection interface to form a reflection signal. The position data and diffusion angle data of the received reflection signal are recorded, and the depth of the water surface can be obtained through the position data and diffusion angle data.

[0040] Example 3: Detection of stratum structure surface: Reference Figure 5The detection principle of the stratum structural surface detection is: using the inherent material frequency characteristics of the soil layer to detect the interface thickness at a certain point, and then determine the distribution of the entire interface or structural surface; the upper and lower layers of the rock-soil interface are completely different, and their corresponding material frequency characteristics are also different. Therefore, the methods of Examples 1 and 2 can be used to effectively detect the rock-soil interface, single-layer structural surface and multi-layer interface without drilling.

[0041] In addition to the above-mentioned embodiments, the present application can also be applied to the detection of the depth, thickness and distribution range of interlayer water stagnation, the depth detection of the sliding surface of the landslide, and the distribution range detection of underground cavities.

[0042] The present application can locate and detect a specific point on the ground through a guiding device, thus achieving single-point vertical multi-layer detection and identification similar to drilling exploration.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A geomagnetic detection method based on a guidance device, characterized in that: The steps include: 1) Arranging a guiding device of set specifications at any position of the detection area where the detection target is located; wherein the guiding device comprises a housing, a guiding probe arranged inside the housing, and adjusting the guiding probe to adjust the diffusion angle of the reflected signal formed by the detection signal; 2) Sending detection signals with different object frequency characteristics to the detection target through the electromagnetic wave transmitter, and guiding the detection signal downward under the guidance of the guiding device. During the guiding process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; 3) When the detection signal contacts the detection target, a reflection signal is formed, and the initial position where the reflection signal is received is recorded, and the reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target; 4) adjusting the guiding probe with reference to the initial position and the first diffusion angle of the reflected signal, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches the set requirement, and marking the position where the reflected signal is received when the diffusion angle of the reflected signal reaches the set requirement as the detection position; 5) Identify the detection target by identifying the object frequency characteristics of the reflected signal, and obtain the depth of the detection target through the detection position and diffusion angle.

2. The geomagnetic detection method based on the guidance device according to claim 1, characterized in that: Under the guidance of the guiding device, the natural magnetic field forms a magnetic field funnel around the guiding device.

3. The geomagnetic detection method based on the guidance device according to claim 1, characterized in that: The guided probe is used to: Direct the natural magnetic field downward and guide the natural magnetic field to change its shape (I); The diffusion angle (II) of the reflected signal formed after contacting the detection target is changed by adjusting the guide probe.

4. The geomagnetic detection method based on the guidance device according to claim 3 is characterized in that: The guide probe is an electromagnetic coil, and the diffusion angle of the reflected signal formed after contacting the detection target is changed by adjusting the diameter of the electromagnetic coil, wherein the diffusion angle of the reflected signal is set to 45° by adjusting the diameter of the electromagnetic coil.

5. The geomagnetic detection method based on the guidance device according to claim 1, characterized in that: The material frequency characteristic refers to the inherent electromagnetic wave resonance frequency possessed by different materials.

6. The geomagnetic detection method based on the guidance device according to claim 1, characterized in that: When the detection signal contacts the detection target, a horizontal interface formed at the position of the detection target is used as a reflection interface.

7. The geomagnetic detection method based on the guidance device according to claim 3, characterized in that: The diffusion angle uses the reflection interface as the diffusion interface, and the diffusion angle is conical.

8. A geomagnetic detection system based on a guidance device, applied to the geomagnetic detection method based on a guidance device according to claims 1 to 7, characterized in that: include: A guiding device, the guiding device comprising a housing and a guiding probe disposed inside the housing, the guiding probe being used to: guide the natural magnetic field downward and guide the natural magnetic field to change its form (I); and change the diffusion angle of the reflected signal formed after contacting the detection target by adjusting the guiding probe (II); An electromagnetic wave transceiver, comprising at least an electromagnetic wave transmitter, an electromagnetic wave receiver and a processor; The electromagnetic wave transmitter is used to send detection signals with different object frequency characteristics to the detection target, and the detection signal is guided downward under the guidance of the guiding device. During the guidance process, the natural magnetic field shape changes, so that the detection signal changes with the change of the natural magnetic field shape; The electromagnetic wave receiver is used to receive the reflection signal formed after the detection signal contacts the detection target, and record the position data and diffusion angle data of the received reflection signal; A processor is connected to the electromagnetic wave receiver, receives the reflection signal, the position data and the diffusion angle data, performs spectrum analysis on the reflection signal to obtain the object frequency characteristics corresponding to the reflection signal, identifies the detection target according to the object frequency characteristics; and obtains the depth of the detection target according to a calculation program set in the processor.

9. The geomagnetic detection system based on the guidance device according to claim 8, characterized in that: The processor is provided with an object frequency feature recognition library, and the detection target is identified by calling the object frequency feature recognition library.

10. The geomagnetic detection system based on the guidance device according to claim 8, characterized in that: The computing program is embedded in the processor.

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