Portable underground pipe network detection device and method based on microwave phase difference

Abstract

The invention relates to a portable underground pipe network detection device based on microwave phase difference, and the device comprises a handle, the handle is provided with a detection main body, the detection main body is provided with an extension block, the extension block is internally provided with a detection unit, and the detection unit comprises a two-dimensional linear antenna array module and a phase difference detection module. The two-dimensional linear antenna array module is used for transmitting microwave signals and receiving reflected microwave signals, and the phase difference detection module is used for analyzing the received microwave signals; the detection main body is provided with a display unit, the display unit comprises a touch control color screen, a state indicating lamp and a laser director, the touch control color screen is used for displaying a voltage difference corresponding to the phase difference of the receiving antenna and a corresponding shadow bar, and the state indicating lamp is used for being electrically connected with the single-chip microcomputer. According to the invention, through the two-dimensional linear antenna array module and the phase difference detection module in the integrated detection unit, rapid, non-contact and high-precision positioning of the underground metal or nonmetal pipeline is realized.

Description

Technical Field

[0001] This application relates to the technical field of detection devices, in particular to a portable underground pipeline network detection device based on microwave phase difference. Background Art

[0002] With the rapid expansion of pipeline systems such as urban drainage, gas, and communication, plastic and composite pipes are gradually replacing traditional metal pipelines due to their advantages such as light weight, corrosion resistance, and convenient construction. According to current specifications, metal tracer wires or routing markers should be laid synchronously when laying non-metallic pipes. However, affected by factors such as construction conditions, subsequent excavation, and lack of operation and maintenance, tracer wires often go missing or fail, resulting in a large number of underground non-metallic pipes "hiding" underground. Traditional metal pipeline detectors cannot provide electromagnetic excitation signals for almost insulating non-metallic pipes, bringing significant difficulties to pipeline network positioning, operation and maintenance, and safety inspection.

[0003] At present, the main means to detect both metal and non-metal targets simultaneously is ground penetrating radar (GPR). It obtains the position, depth, and contour of underground objects through electromagnetic wave reflection imaging. By setting the ground penetrating radar on carriers such as carts or vehicle-mounted devices, the ground penetrating radar is driven by the carrier to move to detect underground pipelines.

[0004] However, the above-mentioned ground penetrating radar is large in size and high in cost, and cannot accurately explore in areas with concentrated pipelines and strong interference signals. Summary of the Invention

[0005] 1. Technical Problem: Based on this, it is necessary to provide a portable underground pipeline network detection device based on microwave phase difference for the problems in the prior art that the ground penetrating radar is large in size and high in cost and cannot accurately explore in areas with concentrated pipelines and strong interference signals.

[0006] 2. Technical Solution: This application provides a portable underground pipeline network detection device based on microwave phase difference, including: The portable underground pipeline network detection device based on microwave phase difference includes: a handle, a detection main body is provided on the handle, an extension block is provided at one end of the detection main body, a detection unit is provided inside the extension block, the detection unit includes a two-dimensional linear antenna array module and a phase difference detection module, the two-dimensional linear antenna array module is used to transmit microwave signals and receive reflected microwave signals, and the phase difference detection module is used to analyze the received microwave signals; One end of the detection body away from the extension block is provided with a display unit. The display unit includes a touch color screen, a status indicator light, and a laser pointer. The touch color screen is used to display the voltage difference corresponding to the phase difference of the receiving antenna and the shadow bar corresponding to the phase difference of the receiving antenna. The status indicator light is used to be electrically connected to the single-chip microcomputer. When the receiving antenna recognizes a preset characteristic target, it controls the indicator light to be constantly on. The laser pointer is used to indicate the detection direction.

[0007] In one embodiment, the two-dimensional linear antenna array module includes a transmitting antenna and a receiving antenna. The transmitting antenna and the receiving antenna are arranged at equal intervals. The transmitting antenna is arranged at the middle position, and the receiving antennas are evenly distributed on both sides of the transmitting antenna.

[0008] In one embodiment, the phase difference detection module includes a radio frequency front and rear terminal sub-module, a phase difference resolver sub-module, an IO control sub-module, a main control chip, and a power supply sub-module; The radio frequency front and rear terminal sub-module is used to generate, amplify, and filter the received adjustable microwave signal; The phase difference resolver sub-module is electrically connected to the radio frequency front and rear terminal sub-module. The phase difference resolver sub-module is used to convert the phase difference of the signals of the two receiving antennas into an analog voltage; The IO control sub-module is used to digitize the analog voltage and output it to the main control chip and synchronously control the touch color screen, the status indicator light, and the laser pointer; The main control chip is used to analyze the digitized voltage and display the analysis result on the touch color screen and control the on and off of the status indicator light based on the analysis result; The power supply sub-module is used to convert the voltage into the corresponding voltages for the detection unit and the display unit.

[0009] In one embodiment, the transmitting antenna includes an adjustable voltage-controlled oscillator. The adjustable voltage-controlled oscillator is connected to a low-noise amplifier, and the low-noise amplifier is connected to a band-pass filter.

[0010] In one embodiment, the touch color screen further includes a numerical control module. The numerical control module is used to control the sensitivity. The numerical control module is arranged on the touch color screen. When receiving the pressure sensing signal in the area of the numerical control module corresponding to the touch color screen, it matches the sensitivity of the corresponding area.

[0011] In one embodiment, the detection body and the handle are set in an inverted "L" shape. One end of the extension block away from the handle is provided with an extension plate matching the number of the transmitting antenna and the receiving antenna. The transmitting antenna and the receiving antenna are embedded in the extension plate, and the distance between the extension plates is the same.

[0012] In one embodiment, the power submodule includes a battery compartment, which is arranged on the end surface of the handle facing away from the groove, and a battery cover for closing the battery compartment is hinged on the handle.

[0013] In one embodiment, the detection body is an injection-molded detection body made of a mixture of flame-retardant ABS and glass fiber materials.

[0014] In one embodiment, a groove is formed on the end surface of the handle facing the extension block.

[0015] In a second aspect, the present application provides a portable underground pipe network detection method based on microwave phase difference, the method comprising: when a worker activates a switch, a power submodule supplies power to each module; The laser pointer starts to emit red light to the detection point; When the touch color screen lights up and is based on the pressure signal of the area of the numerical control module corresponding to the touch color screen, the sensitivity of the corresponding area is matched; The transmitting antenna outputs a microwave signal based on the input voltage of the voltage-controlled oscillator; The receiving antenna receives the microwave signal emitted by the transmitting antenna and reflected after reaching the target and converts it into a phase difference and inputs it into the phase difference solver module; The phase difference solver module converts the phase difference into an analog voltage and inputs it into the IO control module; The IO control submodule digitizes the analog voltage and outputs it to the main control chip; The main control chip analyzes the digital voltage and outputs it to the length of the shadow bar on the touch screen; When the length of the shadow bar exceeds the preset threshold, the main control chip controls the status indicator light corresponding to the receiving antenna to light up.

[0016] 3. Technical Effect: This application can achieve rapid, non-contact, and high-precision positioning of underground metal or non-metallic pipelines by integrating the two-dimensional linear antenna array module and the phase difference detection module in the detection unit; It adopts a left-right symmetrical dual-channel phase difference comparison method, combined with a touch color screen and laser pointer, it can provide real-time feedback of underground structure information and accurately calibrate the target position. It has significant advantages such as compact structure, easy operation, intuitive data, and easy portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 Schematic front view structure diagram of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 2 Schematic side view structure diagram of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 3 Schematic rear view structure diagram of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 4 Schematic internal structure diagram of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 5 Schematic internal structure principle diagram of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 6 Schematic diagram of a touch color screen control panel of a portable underground pipe network detection device based on microwave phase difference in some embodiments of the present application; Figure 7 Schematic geometric positioning diagram of a portable underground pipe network detection method based on microwave phase difference in some embodiments of the present application; Explanation of the reference numerals in the accompanying drawings: 1. Handle; 12. Groove; 2. Detection main body; 3. Extension block; 5. Detection unit; 52. Two-dimensional linear antenna array module; 521. Transmitting antenna; 522. Receiving antenna; 6. Display unit; 62. Touch color screen; 64. Status indicator light; 66. Laser pointer. Specific embodiments

[0019] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the specific embodiments of the present application in detail with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0020] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 a limitation on the present application.

[0021] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0022] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0023] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] In order to solve the problem that geological radar is large in size, high in cost, and cannot be accurately explored in areas where pipelines are concentrated and interference signals are strong, firstly, refer to Figures 1 to 3 As shown, an embodiment of the present application provides a portable underground pipe network detection device based on microwave phase difference, including a handle 1, a detection body 2 is fixedly connected to the handle 1, one end of the detection body 2 is fixedly connected to an extension block 3, the detection body 2 and the extension block 3 are arranged in a "T" shape, and the side between the detection body 2 and the extension block 3 is arranged in an inverted "L" shape. The extension block 3 extends out of the handle 1 and is embedded with a detection unit 5. The detection unit 5 includes a two-dimensional linear antenna array module 52 and a phase difference detection module. The two-dimensional linear antenna array module 52 is used to transmit microwave signals and receive reflected microwave signals, and the phase difference detection module is used to analyze the received microwave signals. A display unit 6 is embedded in the end of the detection body 2 away from the extension block 3. The display unit 6 includes a touch color screen 62, a status indicator light 64 and a laser pointer 66. The touch color screen 62 is used to display the voltage difference corresponding to the phase difference of the receiving antenna 522 and the shadow bar corresponding to the phase difference of the receiving antenna 522. The status indicator light 64 is used to be electrically connected to the single-chip computer. When the receiving antenna 522 recognizes a preset characteristic target, the control indicator light is always on, and the laser pointer 66 is used to indicate the detection direction.

[0026] Among them, the touch color screen 62 is arranged at the center of the extension block 3 away from the extension direction, the control indicator lights are symmetrically arranged below the touch color screen 62, and the status indicator light 64 is arranged on the end face of the extension block 3 away from the handle 1; the handle 1 forms an angle of about 100° with the center plane of the detection head, forming an "L"-shaped silhouette, and the overall outline is an inverted "T" shape with horizontal stretching and vertical convergence.

[0027] It's worth noting that the interior of the handle 1 connects to the interior of the detector head through a continuous hollow cavity to accommodate the power module and signal wiring harness. The handle 1 is perpendicular to the extension of the pipeline, and the main body of the detector is symmetrically arranged on both sides of the top of the handle 1, extending left and right to form a wing-like structure with a smooth outward transition at the edges. The overall lines of the detector are smoothly transitioned, with the center of gravity located near the junction of the handle 1 and the detector head, balancing structural strength and ergonomic requirements.

[0028] A rectangular opening is provided in the center of the detection head, and a touch color screen 62 is embedded therein; two circular openings are arranged on the axis below the opening for installing status indicator lights 64; a laser pointer 66 or other alignment device is installed in the center of the top surface of the detection head. The detection device itself has a certain directivity, and a two-dimensional linear antenna array module 52 is built in the thin part extending from the rear end. The baseline where the antennas are placed is consistent with the extended direction of the pipeline finally detected.

[0029] The display screen is used to display in real time the voltage values converted from the phase differences measured by the left and right groups of receiving antennas 522, and visually display their amplitudes in the form of two longitudinal shadow bars; the length of the shadow bars is linearly corresponding to the amplitude of the phase difference. When any side reaches the set threshold (such as 0.2V), the status indicator light 64 on the corresponding side is automatically lit to prompt the operator of the target direction; the laser pointer 66 is located at the top of the detection head and is used to assist in aligning the underground target direction and improve the positioning accuracy.

[0030] In this embodiment, the present application can achieve rapid, non-contact, and high-precision positioning of underground metal or non-metal pipelines by integrating the two-dimensional linear antenna array module 52 and the phase difference detection module in the detection unit 5; adopting a left-right symmetric dual-channel phase difference comparison method, combined with the touch color screen 62 and the laser indicator, it can provide real-time feedback of underground structure information and accurately calibrate the target position, with significant advantages such as a compact structure, simple operation, intuitive data, and easy portability.

[0031] Refer to Figure 4 and Figure 5 As shown, in some embodiments, the two-dimensional linear antenna array module 52 includes: a transmitting antenna 521 and receiving antennas 522. The transmitting antenna 521 and the receiving antennas 522 are arranged at equal intervals. The transmitting antenna 521 is arranged in the middle position, and the receiving antennas 522 are evenly distributed on both sides of the transmitting antenna 521.

[0032] Among them, in this embodiment, one transmitting antenna 521 is provided, and four receiving antennas 522 are provided. Two receiving antennas 522 are evenly arranged on each side of the transmitting antenna 521; the two-dimensional linear antenna array module 52 is formed by arranging five miniaturized directional antennas linearly at equal intervals, specifically one transmitting antenna 521 and four receiving antennas 522, where the receiving antennas 522 are symmetrically arranged on both sides of the antenna array module, two on each side, and the transmitting antenna 521 is arranged in the exact middle of the antenna array module, and the center distance between the antennas is 1 / 2 of the working wavelength λ; The receiving antennas 522 receive the microwave signals reflected from the underground target and transmit them to the phase difference detection module for analysis. The phase difference detection module compares the received signals on the left and right sides in real time, extracts the change in the phase difference, outputs a voltage signal and transmits it to the display unit 6. If a significant phase change is detected, it means that there is a structure with a significant dielectric constant difference in that direction, such as the boundary of a heterogeneous medium such as an underground pipeline.

[0033] It is worth mentioning that the above antennas are all Yagi microstrip antennas, made of FR-4 dielectric substrate. The central transmitting unit is connected to the VCO-PA module, and the four receiving antennas 522 are connected to the RF front-end sub-module through coaxial cables. The transmitting antenna 521 is driven by a voltage-controlled oscillator and emits a microwave signal with a fixed frequency of 2.45 GHz, which can effectively penetrate the ground surface and be reflected by underground structures.

[0034] Refer to Figure 4 and Figure 5 As shown, in some embodiments, the detection body 2 is generally in an "L" shape for placing the core components of the device. The thin part is used to embed the two-dimensional linear antenna array module 52. The detection body 2 is shaped to fit the two-dimensional linear antenna array module 52 and is provided with four triangular recesses. The thick part of the detection body 2 has a larger chamber for placing the phase difference detection module and the touch color screen 62; the phase difference detection module includes: an RF front and rear terminal sub-module, a phase difference resolver module, an IO control sub-module, a main control chip, and a power supply sub-module; Among them, the phase difference resolver module selects AD8302 with a measurement range of ±180° and a typical linearity of 1°; the RF front and rear terminal sub-module is used to generate, amplify, and filter the received adjustable microwave signal; the phase difference resolver module is electrically connected to the RF front and rear terminal sub-module, and the phase difference resolver module is used to convert the phase difference of the signals of the two receiving antennas 522 into an analog voltage; the IO control sub-module is used to digitize the analog voltage and output it to the main control chip and synchronously control the touch color screen 62, the status indicator 64, and the laser pointer 66; the main control chip is used to analyze the digitized voltage and display the analysis result on the touch color screen 62 and control the on and off of the status indicator 64 based on the analysis result; the power supply sub-module is used to convert the voltage into the corresponding voltages for the detection unit 5 and the display unit 6.

[0035] Among them, the RF front and rear terminal sub-module is used to generate an adjustable microwave signal of 2.35 - 2.55 GHz, amplify, and filter the received signal; the phase difference resolver module uses a dual-channel high-precision phase measurement chip to convert the phase difference of the signals of the two receiving antennas 522 into an analog voltage; the IO control sub-module digitizes the analog voltage through an ADC and outputs it to the main control MCU, and at the same time completes the synchronous control of the RF source and the display module; the power supply sub-module hierarchically converts the DC voltage output by the battery module into different voltages required for RF, logic, and backlight.

[0036] Refer to Figure 5, in one embodiment, the transmitting antenna 521 includes a tunable voltage-controlled oscillator, which is connected to a low-noise amplifier, and the low-noise amplifier is connected to a band-pass filter. The middle transmitting antenna 521 is connected to a microwave signal source. Specifically, the signal source is a voltage-controlled oscillator. By adjusting the voltage input to the voltage-controlled oscillator, the transmitting antenna 521 linearly emits electromagnetic waves of corresponding wavelengths. In this application, the input voltage is fixed to emit microwaves with a frequency of 2.45 GHz. This microwave signal can penetrate the soil layer, and the receiving antennas 522 on both sides of the transmitting antenna 521 can receive the microwave emission signals from underground structures in real time. There is a phase difference in the microwave reflection signals received by the receiving antennas 522 on the same side. When the device points to different positions, the phase difference will change. When receiving microwave emission signals from the edge of underground heterogeneous media, the phase difference will increase significantly and exceed a certain value, and the display unit 6 will prompt the operator.

[0037] In this embodiment, the detection device is simple to operate and convenient to carry, effectively improving the accuracy of the detection work of underground pipe networks and greatly improving the efficiency of the positioning work of underground pipe networks.

[0038] Refer to Figure 6 , in some embodiments, the touch color screen 62 further includes: a numerical control module for controlling the sensitivity. The numerical control module is arranged on the touch color screen 62. When receiving the pressure sensing signal in the area of the numerical control module corresponding to the touch color screen 62, it matches the preset sensitivity of the corresponding area.

[0039] Among them, after the operator turns on the device switch, the laser pointer 66 is automatically turned on, presenting a red dot highlight at the detection location of the device, and the touch color screen 62 lights up. Adjust the sensitivity according to the detection requirements and the actual environment, and the length of the shadow bar changes with the position; keep the device stable until the value of the shadow bar is relatively stable, and then hold it and slowly move it in the area where there may be pipes, keeping the device at the same horizontal height. When the length of a certain shadow bar in the touch color screen 62 exceeds the threshold corresponding to the current sensitivity, the status indicator 64 on that side lights up. Rotate the instrument horizontally until the status indicators 64 on both sides are always on, and it can be determined that there is a linear heterogeneous material at that location. Move it vertically. If the signal is detected again, it can be determined that there is a pipe at that location.

[0040] A portable underground pipe network detection method based on microwave phase difference, refer to Figure 7 , specifically including: After the staff activates the switch, the power supply sub-module supplies power to each module; the laser pointer 66 starts to emit red light to the detection area; when the touch color screen 62 lights up and controls the pressure-sensitive signal of the area of the module based on the value corresponding to the touch color screen 62, the sensitivity of the corresponding area is matched; the transmitting antenna 521 outputs a microwave signal based on the input voltage of the voltage-controlled oscillator; the receiving antenna 522 receives the microwave signal reflected after being transmitted by the transmitting antenna 521 and reaching the target and converts it into a phase difference and inputs it to the phase difference solution operator module; the phase difference solution operator module converts the phase difference into an analog voltage and inputs it to the IO control sub-module; the IO control sub-module digitizes the analog voltage and outputs it to the main control chip; the main control chip analyzes the digitized voltage and outputs it to the shadow bar length of the touch color screen 62; when the shadow bar length exceeds the preset threshold, the main control chip controls the corresponding status indicator light 64 of the receiving antenna 522 to be highlighted.

[0041] Among them, the simple geometric measurement method of burial depth can further expand the device function: for example, in the horizontal detection state, identify the underground pipeline, record the current position, then rotate and lift the device to an angle of 45° with the horizontal plane, and retreat a distance d. If the pipeline signal is identified again, record the device height h at this time, then the burial depth H≈d - h can be estimated. This method does not require an external laser rangefinder or IMU module and is suitable for quickly estimating the target depth. In particular, another method can be adopted, mark the two laser points and measure the distance between them, which is the burial depth.

[0042] The specific operation process includes: after turning on the device power, the laser pointer 66 is automatically activated, generating a beam of red dot-shaped high-brightness laser, pointing to the current detection direction; at the same time, the touch color screen 62 lights up, displaying the current status and the adjustable sensitivity interface. The user adjusts the sensitivity according to the detection requirements and geological conditions. If a group of receiving antennas 522 on one side of the transmitting antenna 521 detects a change in the phase difference, the length of the shadow bar on the same side of the screen will be updated in real time according to the received signal; after keeping the device stable, slowly move the device in the area where the pipeline may exist, keep the antenna array at the same horizontal height, and keep the main body of the detection device at an angle of about 80° with the ground.

[0043] When the single-sided receiving end identifies the edge of the heterogeneous medium, the shadow bar on one side will exceed the threshold, and the MCU controls the corresponding side status indicator light 64 to light up; continue to rotate the device. When both groups of receiving antennas 522 identify the pipeline, both sides meet the threshold conditions at the same time, and the two shadow bars on the color screen are full. At this time, the signal lights on both sides are on. When the operator moves the device horizontally at a low speed and the indicator lights on both sides are continuously on, it can be determined that the current position is directly opposite the underground linear heterogeneous medium structure, such as a pipeline. If the device is further moved a certain distance in the vertical direction and the signal is identified again, it can be confirmed that there is indeed an underground pipeline here, and recording this section of the journey can be used to calculate the pipe diameter.

[0044] In the above process, the structure of the core component, the two-dimensional linear antenna array module 52, is clear. The central transmitting antenna 521 is connected to a voltage-controlled oscillator, and emits a 2.45 GHz microwave signal after regulated power supply. This signal is radiated through the ground surface and reflected when encountering underground heterogeneous media, and is received by the receiving antennas 522 on both sides. Due to the spatial difference in the edge reflection of the target structure, a phase difference appears between the received signals on the same side, and then it is converted into an analog voltage by the high-precision AD8302 calculation chip and output to the MCU for digital and graphical display.

[0045] In this embodiment, it can achieve rapid and non-contact detection of various metal or non-metal underground pipe networks, significantly improve the inspection efficiency, reduce the costs of manual and destructive exploration, and is applicable to various scenarios such as urban drainage, gas pipelines, cable channels, and monitoring of illegal discharges on riverbanks; due to the low antenna transmission power (≤10 dBm) and operating in the ISM licensed frequency band, the device has no electromagnetic safety hazards to the environment and the human body; an external RTK module can be optionally configured to achieve coordinate marking; a pan-tilt can be installed to keep the device self-stable and improve the pipeline detection accuracy; it can also be linked with a mobile phone App through BLE to automatically generate a pipe network census record; it can achieve rapid and non-contact detection of various metal or non-metal underground pipe networks, significantly improve the inspection efficiency, reduce the costs of manual and destructive exploration, and is applicable to various scenarios such as urban drainage, gas pipelines, cable channels, and monitoring of illegal discharges on riverbanks.

[0046] In summary, the handheld microwave phase difference underground detection device is reasonably designed, has a compact structure and high integration. It is suitable for the detection of metal pipelines and also for the positioning of non-metal (such as PVC, PE, etc.) pipelines. It can also be rapidly deployed and applied in complex terrains, and has wide engineering adaptability and practical value.

[0047] In the description of this specification, the description referring to terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0048] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0049] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patented application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all fall within the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A portable underground pipe network detection device based on microwave phase difference, characterized in that, The portable underground pipe network detection device based on microwave phase difference includes: a handle (1), a detection main body (2) is provided on the handle (1), an extension block (3) is provided at one end of the detection main body (2), a detection unit (5) is provided inside the extension block (3), the detection unit (5) includes a two-dimensional linear antenna array module (52) and a phase difference detection module, the two-dimensional linear antenna array module (52) is used for transmitting microwave signals and receiving reflected microwave signals, and the phase difference detection module is used for analyzing the received microwave signals; A display unit (6) is provided at the end of the detection main body (2) away from the extension block (3), the display unit (6) includes a touch color screen (62), a status indicator light (64) and a laser pointer (66), the touch color screen (62) is used for displaying the voltage difference corresponding to the phase difference of the receiving antenna (522) and the shadow bar corresponding to the phase difference of the receiving antenna (522), the status indicator light (64) is used for being electrically connected to the single-chip microcomputer, when the receiving antenna (522) recognizes a preset characteristic target, controlling the indicator light to be always on, and the laser pointer (66) is used for indicating the detection direction.

2. The portable underground pipe network detection device based on microwave phase difference according to claim 1, characterized in that, The two-dimensional linear antenna array module (52) includes: a transmitting antenna (521) and a receiving antenna (522), the transmitting antenna (521) and the receiving antenna (522) are arranged at equal intervals, the transmitting antenna (521) is arranged at the middle position, and the receiving antennas (522) are evenly distributed on both sides of the transmitting antenna (521).

3. The portable underground pipe network detection device based on microwave phase difference according to claim 1, characterized in that, The phase difference detection module includes: a radio frequency front and rear terminal sub-module, a phase difference resolver module, an IO control sub-module, a main control chip and a power supply sub-module; The radio frequency front and rear terminal sub-module is used for generating, amplifying and filtering the received adjustable microwave signal; The phase difference resolver module is electrically connected to the radio frequency front and rear terminal sub-module, and the phase difference resolver module is used for converting the phase difference of the signals of the two receiving antennas (522) into an analog voltage; The IO control sub-module is used for digitizing the analog voltage and outputting it to the main control chip and synchronously controlling the touch color screen (62), the status indicator light (64) and the laser pointer (66); The main control chip is used for analyzing the digitized voltage and displaying the analysis result on the touch color screen (62) and controlling the on and off of the status indicator light (64) based on the analysis result; The power supply sub-module is used for converting the voltage into the corresponding voltages of the detection unit (5) and the display unit (6).

4. The portable underground pipe network detection device based on microwave phase difference according to claim 3, characterized in that The transmitting antenna (521) includes an adjustable voltage controlled oscillator, the adjustable voltage controlled oscillator is connected with a low noise amplifier, and the low noise amplifier is connected with a band-pass filter.

5. The portable underground pipe network detection device based on microwave phase difference according to claim 2, characterized in that, The touch color screen (62) further includes: a numerical control module, the numerical control module is used for controlling the sensitivity, the numerical control module is arranged on the touch color screen (62), and when receiving the pressure sensing signal of the area of the numerical control module corresponding to the touch color screen (62), matching the preset sensitivity of the corresponding area.

6. The portable underground pipe network detection device based on microwave phase difference according to claim 2, characterized in that, The detection body (2) and the handle (1) are arranged in an inverted "L" shape, and an end of the extension block (3) away from the handle (1) is provided with extension plates matching the number of transmitting antennas (521) and receiving antennas (522), the transmitting antennas (521) and receiving antennas (522) being embedded in the extension plates, and the spacing between the extension plates is the same.

7. The portable underground pipe network detection device based on microwave phase difference according to claim 1, characterized in that, The power submodule comprises a battery compartment, which is arranged on the end face of the handle (1) facing away from the groove (12), and a battery cover for closing the battery compartment is hingedly connected to the handle (1).

8. The portable underground pipe network detection device based on microwave phase difference according to claim 1, characterized in that, The detection body (2) is an injection-molded detection body (2) made of a mixture of flame-retardant ABS and glass fiber materials.

9. The portable underground pipe network detection device based on microwave phase difference according to claim 1, characterized in that A groove (12) is provided on the end surface of the handle (1) facing the extension block (3).

10. A portable underground pipe network detection method based on microwave phase difference, characterized in that, The portable underground pipe network detection method based on microwave phase difference includes: when a worker activates a switch, a power submodule supplies power to each module; The laser pointer starts to emit red light to the detection point; When the touch color screen lights up and is based on the pressure signal of the area of the numerical control module corresponding to the touch color screen, the sensitivity of the corresponding area is matched; The transmitting antenna outputs a microwave signal based on the input voltage of the voltage-controlled oscillator; The receiving antenna receives the microwave signal emitted by the transmitting antenna and reflected after reaching the target and converts it into a phase difference and inputs it into the phase difference solver module; The phase difference solver module converts the phase difference into an analog voltage and inputs it into the IO control module; The IO control submodule digitizes the analog voltage and outputs it to the main control chip; The main control chip analyzes the digital voltage and outputs it to the length of the shadow bar on the touch screen; When the length of the shadow bar exceeds the preset threshold, the main control chip controls the status indicator light corresponding to the receiving antenna to light up.

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