Geomagnetic detection method and system based on guidance device

Abstract

The geomagnetic detection method based on a guiding device includes the following steps: placing a guiding device of set specifications at any position in the detection area where the detection target is located; the guiding device includes a shell and a guiding probe arranged inside the shell, and the diffusion angle of the reflection signal formed by the detection signal is adjusted by adjusting the guiding probe; a detection signal with different object frequency characteristics is sent to the detection target by an electromagnetic wave transmitter, 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; when the detection signal contacts the detection target, a reflection signal is formed, and the initial position of the received reflection signal is recorded. The reflection signal is reflected according to the set first diffusion angle when the guiding probe encounters the detection target; the detection target is identified by identifying the object frequency characteristics of the reflection signal, and the depth of the detection target is obtained through the detection position and the diffusion 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 those used in pipeline, groundwater, underground pipe piles, and cast-in-place pile inspections, generally employ radar and Gaussmeter probes. Radar detection is susceptible to external interference, making it difficult to achieve the required detection accuracy. Furthermore, radar detection is affected by the depth of detection, and it is unable to detect targets at a certain depth. Gaussmeter probes are generally used in cast-in-place pile inspections. However, Gaussmeter probes require drilling downwards around the cast-in-place pile to install the Gaussmeter probes. Furthermore, Gaussmeter probes are only useful for inspecting the body of cast-in-place piles. Due to the small relative distance between the steel bars in a cast-in-place pile, the Gaussmeter probes detect from one side of the pile body inwards. Multiple steel bars can easily cause signal interference, resulting in significant error interference in the detection of steel bars in the cast-in-place piles.

[0003] Furthermore, in conventional technologies, drilling 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:

[0006] The present invention provides a geomagnetic detection method based on a guidance device, comprising the following steps:

[0007] 1) Deploying a guiding device of set specifications at any location within a detection area where a detection target is located; wherein the guiding device includes a housing and a guiding probe disposed within the housing, and adjusting the guiding probe to adjust the diffusion angle of a reflected signal formed by a detection signal;

[0008] 2) transmitting a detection signal having different object frequency characteristics to the detection target through an electromagnetic wave transmitter, and guiding the detection signal 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;

[0009] 3) When the detection signal contacts the detection target, a reflection signal is generated, and the initial position of the reflection signal is recorded. The reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target;

[0010] 4) adjusting the guide probe using the initial position and the first diffusion angle of the reflected signal as a reference, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches a 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;

[0011] 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.

[0012] Furthermore, under the guidance of the guiding device, the natural magnetic field forms a magnetic field funnel around the guiding device.

[0013] Furthermore, the guide probe is used to:

[0014] Directing the natural magnetic field downward and causing the natural magnetic field to change in shape (I);

[0015] The diffusion angle (II) of the reflected signal formed after contacting the detection target is changed by adjusting the guide probe.

[0016] Furthermore, the guiding 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.

[0017] Furthermore, the material frequency characteristic refers to the inherent electromagnetic wave resonance frequency of different materials.

[0018] 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.

[0019] Furthermore, the diffusion angle uses a reflection interface as a diffusion interface, and the diffusion angle is conical.

[0020] 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:

[0021] A guiding device, comprising a housing and a guiding probe disposed within the housing, wherein the guiding probe is used to: guide the natural magnetic field downward and induce a change in the shape of the natural magnetic field (I); and change the diffusion angle of a reflected signal formed after contact with a detection target by adjusting the guiding probe (II);

[0022] An electromagnetic wave transceiver, comprising at least an electromagnetic wave transmitter, an electromagnetic wave receiver, and a processor;

[0023] The electromagnetic wave transmitter is used to send a detection signal with different object frequency characteristics to the detection target, and guides the detection signal downward under the guidance of the guidance 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;

[0024] The electromagnetic wave receiver is used to receive a reflection signal formed after the detection signal contacts the detection target, and record position data and diffusion angle data of the received reflection signal;

[0025] A processor is connected to the electromagnetic wave receiver, receives the reflected signal, the position data, and the diffusion angle data, performs spectrum analysis on the reflected signal to obtain the object frequency characteristics corresponding to the reflected signal, identifies the detection target based on the object frequency characteristics, and obtains the depth of the detection target according to a calculation program set in the processor.

[0026] 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.

[0027] Furthermore, the computing program is embedded in the processor.

[0028] 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 forms an energy-gathering effect. On the one hand, the natural magnetic field is converged downward, reducing interference on the surrounding side; on the other hand, the energy-gathering effect of the natural magnetic field increases the depth of detection.

[0029] 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.

[0030] In the present application, different detection targets have different physical frequency characteristics. 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

[0031] 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.

[0032] Figure 1 It is a flow chart of the method provided by the present invention;

[0033] Figure 2 This is a model diagram for calculating the depth of a detected target provided by the present invention;

[0034] Figure 3 This is a model diagram of the detection of the cast-in-place pile provided by the present invention;

[0035] Figure 4 It is a model diagram for detecting different groundwater levels provided by the present invention;

[0036] Figure 5 It is a model diagram for detecting the stratum structure provided by the present invention. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0038] The principle behind this application is that a guiding device guides the electromagnetic field vertically downward, focusing the electromagnetic waves of the natural magnetic field and causing them to propagate downward, thus changing the shape of the magnetic field. The natural magnetic field is horizontal in an undisturbed environment. When placed in the guiding device, the Earth's magnetic field forms a magnetic funnel around the guiding device, creating an energy-gathering effect.

[0039] Electromagnetic waves from a natural magnetic field reflect when they encounter different materials, reflecting electromagnetic waves with the material's unique physical frequency characteristics. This reflection takes on a conical shape. Therefore, in a natural magnetic field, only electromagnetic waves that match the physical frequency characteristics of the target are reflected when they encounter the target. Based on this principle, simply performing spectral analysis on the received transmitted signal to obtain its corresponding spectrum information and the corresponding electromagnetic wave resonant frequency can determine the target's material. Furthermore, the reflection angle and corresponding detection data can be used to calculate the target's depth.

[0040] Reference Figure 1 Based on the above principles, the present invention provides a geomagnetic detection method based on a guidance device, comprising the following steps:

[0041] 1) Deploying a guiding device of set specifications at any location within a detection area where a detection target is located; wherein the guiding device includes a housing and a guiding probe disposed within the housing, and adjusting the guiding probe to adjust the diffusion angle of a reflected signal formed by a detection signal;

[0042] 2) transmitting a detection signal having different object frequency characteristics to the detection target through an electromagnetic wave transmitter, and guiding the detection signal 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;

[0043] 3) When the detection signal contacts the detection target, a reflection signal is generated, and the initial position of the reflection signal is recorded. The reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target;

[0044] 4) adjusting the guide probe using the initial position and the first diffusion angle of the reflected signal as a reference, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches a 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;

[0045] 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.

[0046] Furthermore, under the guidance of the guiding device, the natural magnetic field forms a magnetic field funnel around the guiding device.

[0047] Furthermore, the guide probe is used to:

[0048] Directing the natural magnetic field downward and causing the natural magnetic field to change in shape (I);

[0049] The diffusion angle (II) of the reflected signal formed after contacting the detection target is changed by adjusting the guide probe.

[0050] Furthermore, the guiding 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.

[0051] Furthermore, the material frequency characteristic refers to the inherent electromagnetic wave resonance frequency of different materials.

[0052] 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.

[0053] Furthermore, the diffusion angle uses a reflection interface as a diffusion interface, and the diffusion angle is conical.

[0054] 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:

[0055] A guiding device, comprising a housing and a guiding probe disposed within the housing, wherein the guiding probe is used to: guide the natural magnetic field downward and induce a change in the shape of the natural magnetic field (I); and change the diffusion angle of a reflected signal formed after contact with a detection target by adjusting the guiding probe (II);

[0056] An electromagnetic wave transceiver, comprising at least an electromagnetic wave transmitter, an electromagnetic wave receiver, and a processor;

[0057] The electromagnetic wave transmitter is used to send a detection signal with different object frequency characteristics to the detection target, and guides the detection signal downward under the guidance of the guidance 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;

[0058] The electromagnetic wave receiver is used to receive a reflection signal formed after the detection signal contacts the detection target, and record position data and diffusion angle data of the received reflection signal;

[0059] A processor is connected to the electromagnetic wave receiver, receives the reflected signal, the position data, and the diffusion angle data, performs spectrum analysis on the reflected signal to obtain the object frequency characteristics corresponding to the reflected signal, identifies the detection target based on the object frequency characteristics, and obtains the depth of the detection target according to a calculation program set in the processor.

[0060] Furthermore, the processor is provided with a recognition library for object frequency characteristics, and the detection target is identified by calling the recognition library for object frequency characteristics; the object frequency characteristic 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 all be measured by instruments.

[0061] Furthermore, the computing program is embedded in the processor.

[0062] 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 forms an energy-gathering effect. On the one hand, the natural magnetic field is converged downward, reducing interference on the surrounding side; on the other hand, the energy-gathering effect of the natural magnetic field increases the depth of detection.

[0063] The present application changes the diffusion angle of the reflected signal 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 the received reflected signal. Figure 2When 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 guidance device.

[0064] In the present application, different detection targets have different physical frequency characteristics. The transmitted signal reflects the physical frequency characteristics of the detection target, and the detection target can be identified through the physical frequency characteristics.

[0065] Based on the above technical solutions, this application provides specific descriptions with examples.

[0066] Example 1, detection of cast-in-place piles:

[0067] Reference Figure 3 Since the detection is 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. The position data and diffusion angle data of the received reflection signal are recorded. The pile length can be obtained through the position data and diffusion angle data.

[0068] If a pile breaks, 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 suitable for broken pile detection.

[0069] 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 broken bars.

[0070] 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 downward and enrich, 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 will be formed for the bored pile, and there will be no mutual electromagnetic interference between single piles, solving the problem of mutual radiation interference between pile bodies.

[0071] Example 2: Holeless detection of groundwater level:

[0072] Reference Figure 4Since in this application, the horizontal interface where the detection target is located is used as the reflection interface to form a reflection signal, the horizontal interface of water levels at different depths is different. The detection signal is guided downward under the guidance of the guiding device using the detection signal corresponding to the physical frequency characteristics of water. 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.

[0073] Example 3: Detection of stratum structure surface:

[0074] Reference Figure 5 The detection principle of the stratum structural surface is: using the inherent material frequency characteristics of the soil layer to detect the thickness of the interface 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 in material, 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.

[0075] In addition to the above-mentioned embodiments, the present application can also be applied to the following detections: depth, thickness and distribution range of interlayer stagnant water, depth detection of the sliding surface of landslides, and distribution range detection of underground cavities.

[0076] This application can locate and detect a specific point on the ground through a guiding device, realizing single-point vertical multi-layer detection and identification similar to drilling exploration.

[0077] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A geomagnetic detection method based on a guidance device, characterized in that: The steps include: 1) Deploying a guiding device of set specifications at any location within a detection area where a detection target is located; wherein the guiding device includes a housing and a guiding probe disposed within the housing, and adjusting the guiding probe to adjust the diffusion angle of a reflected signal formed by a detection signal; 2) transmitting a detection signal having different object frequency characteristics to the detection target through an electromagnetic wave transmitter, and guiding the detection signal 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; 3) When the detection signal contacts the detection target, a reflection signal is generated, and the initial position of the reflection signal is recorded. The reflection signal is reflected according to the set first diffusion angle when the guide probe encounters the detection target; 4) adjusting the guide probe using the initial position and the first diffusion angle of the reflected signal as a reference, repeating steps 1) to 3) until the diffusion angle of the reflected signal reaches a 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 by detecting the position and diffusion angle; The guiding 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. The diffusion angle of the reflected signal is set to 45° by adjusting the diameter of the electromagnetic coil.

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: Directing the natural magnetic field downward and causing the natural magnetic field to change in 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 1, characterized in that: The object frequency characteristic refers to the inherent electromagnetic wave resonance frequency of different substances.

5. 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.

6. 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 cone-shaped.

7. A geomagnetic detection system based on a guidance device, applied to any one of the geomagnetic detection methods based on a guidance device according to claims 1 to 6, characterized in that: include: A guiding device, comprising a housing and a guiding probe disposed within the housing, wherein the guiding probe is used to: guide the natural magnetic field downward and induce a change in the shape of the natural magnetic field (I); and change the diffusion angle of a reflected signal formed after contact with a 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 a detection signal with different object frequency characteristics to the detection target, and guides the detection signal downward under the guidance of the guidance 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 a reflection signal formed after the detection signal contacts the detection target, and record position data and diffusion angle data of the received reflection signal; A processor is connected to the electromagnetic wave receiver, receives the reflected signal, the position data, and the diffusion angle data, performs spectrum analysis on the reflected signal to obtain the object frequency characteristics corresponding to the reflected signal, identifies the detection target based on the object frequency characteristics, and obtains the depth of the detection target according to a calculation program set in the processor.

8. The geomagnetic detection system based on the guidance device according to claim 7, 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.

9. The geomagnetic detection system based on the guidance device according to claim 7, characterized in that: The computing program is embedded in the processor.

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