Dual-frequency dual-polarized reinforced concrete quality detection device and operation method thereof

Abstract

The application discloses a kind of dual-frequency dual-polarized reinforced concrete quality detection device and its operating method, the device includes dual-frequency dual-polarized ultra-wideband antenna, dual-frequency acquisition control processing system and display control terminal, the dual-frequency dual-polarized ultra-wideband antenna is integrated together with dual-frequency acquisition control processing system, including a pair of horizontal polarization intermediate frequency transceiving ultra-wideband antenna and two pairs of vertical polarization high frequency transceiving ultra-wideband antenna, and dual-frequency acquisition control processing system is interacted with display control terminal by wireless communication mode.The device disclosed in the application adopts middle, high frequency antenna combination, solves the problem of mutual restriction of detection depth and resolution, greatly improves detection performance.Horizontal, vertical dual-polarized detection technology is used, the electromagnetic shielding effect of shallow reinforcement mesh is overcome, and the detection ability of deep target is improved.

Description

Technical Field

[0001] This invention belongs to the field of ground penetrating radar, and specifically relates to a device and its operating method for detecting the quality of reinforced concrete. Background Technology

[0002] Concrete, with its rigidity and durability, is widely used in the construction industry, appearing in buildings, bridges, tunnels, and large-diameter underground pipelines. However, quality problems during construction and structural changes over time can lead to safety risks associated with reinforced concrete. Therefore, it is necessary to constantly monitor the internal structure of reinforced concrete in buildings to prevent safety accidents.

[0003] Ground-penetrating radar (GPR), a non-destructive testing technology, is widely used in the detection of concealed underground targets. Its non-destructive nature makes it particularly suitable for the quality inspection of reinforced concrete. GPR emits ultra-wideband radio electromagnetic waves into reinforced concrete and receives the echo information to determine the thickness of the reinforced concrete, the distribution of reinforcing bars, the degree of compaction, and internal voids, thereby generating a health report of the reinforced concrete. This allows for appropriate maintenance measures to be taken to eliminate potential hazards.

[0004] Existing detection devices and methods are based on a single-frequency configuration and a single-transmit / receive mode, which suffers from the problem of mutual constraints between resolution and detection depth. Furthermore, they are affected by the internal steel reinforcement of concrete, making it difficult to detect deep-seated defects. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a dual-frequency dual-polarization reinforced concrete quality detection device and its operation method. Based on dual-frequency fusion detection technology, it takes into account both detection depth and detection resolution. Based on dual-polarization detection technology, it overcomes the influence of steel bar interference and shielding, thereby improving the detection effect on deep-seated defects.

[0006] The present invention adopts the following technical solution:

[0007] An improved dual-frequency dual-polarization reinforced concrete quality testing device includes a dual-frequency dual-polarization ultra-wideband antenna, a dual-frequency data acquisition and control processing system, and a display and control terminal. The dual-frequency dual-polarization ultra-wideband antenna and the dual-frequency data acquisition and control processing system are integrated together, including one horizontally polarized intermediate frequency transceiver ultra-wideband antenna and two vertically polarized high frequency transceiver ultra-wideband antennas. The dual-frequency data acquisition and control processing system interacts with the display and control terminal via wireless communication.

[0008] Furthermore, the dual-frequency dual-polarized ultra-wideband antenna is a planar dipole antenna, which belongs to the category of linearly polarized antennas.

[0009] Furthermore, the center frequency of the horizontally polarized intermediate frequency transceiver ultra-wideband antenna is between 400MHz and 500MHz, while the center frequency of the vertically polarized high frequency transceiver ultra-wideband antenna is between 900MHz and 1GHz.

[0010] Furthermore, the horizontally polarized intermediate frequency transceiver ultra-wideband antenna is on the outside, the intermediate frequency transmitting antenna is at the front, and the intermediate frequency receiving antenna is at the end; the vertically polarized high frequency transceiver ultra-wideband antenna is in the middle, and the two high frequency antennas are arranged alternately in the manner of transmitting antenna-receiving antenna-transmitting antenna-receiving antenna.

[0011] Furthermore, the major axis length of the intermediate frequency antenna is equal to the sum of the minor axis lengths of the four high frequency antennas.

[0012] Furthermore, each transmitting antenna is equipped with an independent transmitter, antenna array, absorbing material, and metal shielding cavity; each receiving antenna is equipped with an independent receiver, antenna array, absorbing material, and metal shielding cavity.

[0013] Furthermore, the dual-frequency acquisition and control processing system includes an embedded control module, a stepping and pulse forming module, a high-frequency switching module, a data acquisition module, and a power supply and peripheral module;

[0014] The embedded control module generates the working timing according to the control parameters of the display and control terminal, controls the generation of the transmission trigger signal and the data acquisition module to collect the antenna echo signal; the stepping and pulse forming module modulates the transmission trigger signal into the signal form required by the transmission antenna; the high-frequency switching module is used to switch between different antennas; the power supply and peripheral module provides the working power of the entire device and receives external synchronization signals and positioning data.

[0015] Furthermore, the power supply and peripheral modules include rechargeable batteries.

[0016] Furthermore, the dual-frequency acquisition and control processing system provides both a rotation measurement interface and a positioning interface.

[0017] An operating method applicable to the above-mentioned device is improved in that: the dual-frequency dual-polarized ultra-wideband antenna is controlled by the dual-frequency acquisition and control processing system to operate in a time-division multiplexing manner, first performing the intermediate frequency antenna's transmission and reception acquisition, and then performing the high-frequency antenna's transmission and reception acquisition. Adjacent high-frequency antennas can combine transmission and reception. Each acquisition trigger acquires data from four receiving channels, including one channel of intermediate frequency data and three channels of high-frequency data. Then, through dual-frequency data fusion, data from three measurement lines are acquired simultaneously.

[0018] The beneficial effects of this invention are:

[0019] The device disclosed in this invention employs a combination of medium and high frequency antennas, solving the problem of mutual constraints between detection depth and resolution, and greatly improving detection performance. It utilizes horizontal and vertical dual-polarization detection technology to overcome the electromagnetic shielding effects of shallow steel mesh, improving the detection capability for deep targets. The integrated, compact small array structure enables simultaneous acquisition of multi-channel data, improving target detection accuracy.

[0020] The device disclosed in this invention utilizes dual-frequency fusion and dual-polarization detection technology. Through parameter configuration and multi-channel timing control, it can acquire multiple detection data of two frequencies and two polarization modes at one time. After data fusion analysis and processing, the internal morphological information of reinforced concrete can be obtained. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the device disclosed in this invention;

[0022] Figure 2 This is a schematic diagram of the dual-frequency acquisition and control processing system in the device disclosed in this invention;

[0023] Figure 3 This is a schematic diagram of the layout of the dual-frequency dual-polarized ultra-wideband antenna in the device disclosed in this invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example 1: This example discloses a dual-frequency dual-polarization reinforced concrete quality testing device, such as... Figure 1 As shown, the system includes a dual-frequency, dual-polarization ultra-wideband antenna 1, a dual-frequency data acquisition and control processing system 2, and a display and control terminal 3. The dual-frequency, dual-polarization ultra-wideband antenna and the dual-frequency data acquisition and control processing system are integrated together, including one horizontally polarized intermediate frequency transceiver ultra-wideband antenna and two vertically polarized high frequency transceiver ultra-wideband antennas. The dual-frequency data acquisition and control processing system interacts with the display and control terminal via wireless communication. Users can remotely control the device's operating parameters through the display and control terminal, view the acquired detection images in real time, and manage the acquired data and processing results in an engineered manner.

[0026] like Figure 2 As shown, the dual-frequency acquisition and control processing system includes an embedded control module 21, a stepping and pulse forming module 22, a high-frequency switching module 23, a data acquisition module 24, and a power supply and peripheral module 25;

[0027] The embedded control module generates the operating timing sequence based on the control parameters of the display and control terminal, controlling the generation of the transmission trigger signal and the data acquisition module to acquire the antenna echo signal; the stepping and pulse forming module precisely delays and conditions the transmission trigger signal into the signal form required by the transmitting antenna; the high-frequency switching module is used to switch between different antennas; the data acquisition module contains three acquisition channels, each corresponding to one of the three receiving antenna signals, acquiring them simultaneously to improve efficiency; the power supply and peripheral module provides the operating power for the entire device and receives external synchronization signals and positioning data. The power supply and peripheral module includes a rechargeable battery.

[0028] In addition, the dual-frequency acquisition and control processing system also provides a rotation interface and a positioning interface to jointly complete the signal transmission and reception, data acquisition and processing of the entire device.

[0029] Multi-channel refers to the fact that in this invention, the intermediate frequency antenna consists of one pair of transmit and receive antennas, and the high frequency antenna consists of two pairs of transmit and receive antennas, with the transmit and receive signals interleaved. A single pulse-triggered detection can simultaneously acquire data from four receiving channels.

[0030] Dual-frequency fusion technology combines the structural characteristics of reinforced concrete with a combination of medium and high frequency antennas, arranged in a reasonable manner, to jointly complete the inspection of the reinforced concrete in the inspection area.

[0031] In ground-penetrating radar (GPR) detection, the detection depth is affected by many factors, including the efficiency of the transmitting and receiving antennas, the transmitter pulse amplitude, the receiver sensitivity, and propagation path loss. Propagation path loss is related to the antenna frequency and the characteristics of the medium. In concrete, the propagation path loss is a function of the antenna frequency; the lower the antenna frequency, the smaller the path loss, and the deeper the detection depth. Conversely, the higher the antenna frequency, the greater the path loss, and the shallower the detection depth.

[0032] Ground penetrating radar (GPR) resolution includes both vertical resolution and horizontal resolution. Vertical resolution represents the GPR's ability to distinguish targets in the vertical direction, and its calculation formula is as follows: Lateral resolution is the smallest target size that a radar can resolve in the horizontal direction, and it is usually calculated using Fresnel methods. According to the formula, the higher the antenna frequency, the lower the vertical and horizontal resolution; conversely, the lower the antenna frequency, the higher the vertical and horizontal resolution.

[0033] To address the trade-off between antenna detection depth and resolution, and considering the application requirements of reinforced concrete inspection (dielectric constant ε), r=9), the center frequency of the two ultra-wideband antennas used in this invention is required to be no less than one harmonic to meet the antenna size and structural design requirements. The center frequency of the horizontally polarized intermediate frequency transceiver ultra-wideband antenna is 400MHz~500MHz, achieving a detection depth of 2m~3m, a vertical resolution of 10cm~12.5cm, and a horizontal resolution of 4.5cm~6.1cm; the center frequency of the vertically polarized high frequency transceiver ultra-wideband antenna is 900MHz~1GHz, achieving a detection depth of 0.5m~1m, a vertical resolution of 5cm~5.5cm, and a horizontal resolution of 1.6cm~2.3cm, which can meet the needs of most detection scenarios.

[0034] Dual-polarization detection refers to the fact that the polarization direction of the ground-penetrating radar antenna can be either aligned with or perpendicular to the direction of motion. The dual-frequency dual-polarization ultra-wideband antenna used in this invention is a planar dipole antenna, which belongs to linear polarization antennas. When the electric field direction of the electromagnetic wave radiated by the antenna is aligned with the direction of motion, it is horizontal polarization detection, which is more effective for detecting horizontally arranged steel bars. When the electric field direction of the electromagnetic wave radiated by the antenna is perpendicular to the direction of motion, it is vertical polarization detection, which is more effective for detecting vertically arranged steel bars.

[0035] In this invention, the intermediate frequency antenna adopts a horizontal polarization layout, focusing on detecting the arrangement of horizontal reinforcing bars. The high frequency antenna adopts a vertical polarization layout, weakening the electromagnetic shielding effect of the horizontal reinforcing bars and focusing on detecting the state of the concrete beneath the reinforcing bars. The two complement each other, jointly ensuring the detection effect.

[0036] like Figure 3 As shown, the horizontally polarized intermediate frequency (IF) transceiver ultra-wideband antenna is on the outside, the IF transmitting antenna 11 is at the front, and the IF receiving antenna 12 is at the end; the vertically polarized high-frequency transceiver ultra-wideband antenna is in the middle, and the two high-frequency antennas are arranged alternately in the pattern of transmitting antenna 13-receiving antenna 14-transmitting antenna 15-receiving antenna 16. The major axis length of the IF antenna is equal to the sum of the minor axis lengths of the four high-frequency antennas to ensure the overall consistency of the structure.

[0037] Each transmitting antenna is equipped with an independent transmitter, antenna array, absorbing material, and metal shielding cavity to realize the function of converting the trigger pulse signal into an ultra-wideband signal for transmission; each receiving antenna is equipped with an independent receiver, antenna array, absorbing material, and metal shielding cavity to realize the function of equivalent sampling of the echo signal.

[0038] This embodiment also discloses an operating method applicable to the above-mentioned device. The dual-frequency acquisition and control processing system controls the dual-frequency dual-polarized ultra-wideband antenna to work in a time-division multiplexing manner. First, the intermediate frequency antenna is used for transmission and reception acquisition, and then the high frequency antenna is used for transmission and reception acquisition. Adjacent high frequency antennas can be combined to transmit and receive. Each acquisition trigger acquires data from four receiving channels, including one channel of intermediate frequency data and three channels of high frequency data. Then, through dual-frequency data fusion, data from three measurement lines are acquired simultaneously.

Claims

1. A dual-frequency dual-polarization reinforced concrete quality testing device, characterized in that: It includes a dual-frequency dual-polarization ultra-wideband antenna, a dual-frequency acquisition and control processing system, and a display and control terminal. The dual-frequency dual-polarization ultra-wideband antenna and the dual-frequency acquisition and control processing system are integrated together, including one horizontally polarized intermediate frequency transceiver ultra-wideband antenna and two vertically polarized high frequency transceiver ultra-wideband antennas. The dual-frequency acquisition and control processing system interacts with the display and control terminal through wireless communication.

2. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The dual-frequency dual-polarized ultra-wideband antenna is a planar dipole antenna, which belongs to the category of linearly polarized antennas.

3. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The center frequency of a horizontally polarized intermediate frequency transceiver ultra-wideband antenna is between 400MHz and 500MHz, while the center frequency of a vertically polarized high frequency transceiver ultra-wideband antenna is between 900MHz and 1GHz.

4. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The horizontally polarized intermediate frequency transceiver ultrawideband antenna is on the outside, the intermediate frequency transmitting antenna is at the front end, and the intermediate frequency receiving antenna is at the end. The vertically polarized high-frequency transceiver ultra-wideband antenna is in the middle, and the two high-frequency antennas are arranged alternately in the manner of transmitting antenna-receiving antenna-transmitting antenna-receiving antenna.

5. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 4, characterized in that: The major axis length of an intermediate frequency antenna is equal to the sum of the minor axis lengths of four high frequency antennas.

6. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 4, characterized in that: Each transmitting antenna is equipped with an independent transmitter, antenna array, absorbing material, and metal shielding cavity; each receiving antenna is equipped with an independent receiver, antenna array, absorbing material, and metal shielding cavity.

7. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The dual-frequency data acquisition and control processing system includes an embedded control module, a stepping and pulse forming module, a high-frequency switching module, a data acquisition module, and a power supply and peripheral module. The embedded control module generates the working timing according to the control parameters of the display and control terminal, controls the generation of the transmission trigger signal and the data acquisition module to collect the antenna echo signal; the stepping and pulse forming module modulates the transmission trigger signal into the signal form required by the transmission antenna; the high-frequency switching module is used to switch between different antennas; the power supply and peripheral module provides the working power of the entire device and receives external synchronization signals and positioning data.

8. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The power supply and peripheral modules include rechargeable batteries.

9. The dual-frequency dual-polarization reinforced concrete quality testing device according to claim 1, characterized in that: The dual-frequency data acquisition and control processing system provides both a rotation measurement interface and a positioning interface.

10. A method of operation, applicable to the apparatus of claim 1, characterized in that: The dual-frequency acquisition and control processing system controls the dual-frequency dual-polarized ultra-wideband antenna to work in a time-division multiplexing manner. First, the intermediate frequency antenna is used for transmission and reception acquisition, and then the high frequency antenna is used for transmission and reception acquisition. Adjacent high frequency antennas can be combined to transmit and receive. Each acquisition trigger acquires data from four receiving channels, including one channel of intermediate frequency data and three channels of high frequency data. Then, through dual-frequency data fusion, data from three measurement lines are acquired simultaneously.

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