Phase-locked magnetic gradient buried pipeline nondestructive testing device

Abstract

The utility model discloses a phase-locked magnetic gradient buried pipeline nondestructive testing device which comprises a cathode protection pile, a signal converter, a frequency generator, a transmitting radio station, a receiving radio station, a phase-locked loop, a phase-locked amplifier, a band-pass filter, a sensor and an ADC (Analog to Digital Converter), the output end of the cathode protection pile is connected with a pipeline, the other output end of the frequency generator is connected with the transmitting radio station, the output end of the receiving radio station is connected with the phase-locked loop, one output end of the phase-locked loop is connected with the band-pass filter, the other output end of the phase-locked loop is connected with the phase-locked amplifier, and the output end of the sensor is connected with the band-pass filter. The output end of the band-pass filter is connected with the lock-in amplifier, and the output end of the lock-in amplifier is connected with the ADC. According to the utility model, the stability and precision of the nondestructive testing of the buried pipeline are improved, and the detection interference and noise are reduced.

Description

Technical Field

[0001] This utility model relates to the field of non-destructive testing technology, and in particular to a phase-locked magnetic gradient buried pipeline non-destructive testing device. Background Technology

[0002] Due to their concealed nature and the complexity of environmental factors, the safety status monitoring and evaluation of buried pipelines has always been a major challenge in the engineering field. Especially in high-risk areas such as oil and gas pipelines, the overall performance of the pipeline is highly susceptible to exceeding its ultimate load-bearing capacity, leading to accidents such as deformation and fracture failure. Corrosion can also cause localized defects and cracking. Therefore, regular inspection and maintenance of the safety status of buried pipelines is a crucial means of ensuring the stable operation of pipeline projects.

[0003] However, traditional buried pipeline inspection technologies, such as electromagnetic methods, suffer from drawbacks such as stringent application conditions, large routing errors, heavy and inconvenient equipment, and cumbersome operation procedures, which greatly limit the inspection and maintenance of buried pipelines. New non-contact magnetic stress detection technology can remotely inspect buried pipelines under excavation conditions. This method determines the presence of safety hazards by observing magnetic anomaly data in the pipeline, demonstrating high practicality. However, its innovation focuses primarily on the detection method, lacking exploration in signal processing. The actual detection environment is complex and variable, and the detected pipeline data is mixed with various environmental interferences, making it difficult to extract the required data parameters from the complex detection data, thus leading to false detections. Utility Model Content

[0004] To address the problem that existing non-destructive testing technologies for buried pipelines cannot accurately and efficiently extract useful signals from sensor detection data due to the influence of environmental factors, this invention proposes a phase-locked magnetic gradient non-destructive testing device for buried pipelines, thus solving the aforementioned problem.

[0005] This application discloses a phase-locked magnetic gradient buried pipeline non-destructive testing device, including a cathodic protection pile, a signal converter, a frequency generator, a transmitting radio station, a receiving radio station, a phase-locked loop, a lock-in amplifier, a bandpass filter, a sensor, and an ADC. One output terminal of the frequency generator is connected to the cathodic protection pile through the signal converter, and the output terminal of the cathodic protection pile is connected to the pipeline. The other output terminal of the frequency generator is connected to the transmitting radio station, and the output terminal of the receiving radio station is connected to the phase-locked loop. One output terminal of the phase-locked loop is connected to the bandpass filter, and the other output terminal of the phase-locked loop is connected to the lock-in amplifier. The output terminal of the sensor is connected to the bandpass filter, the output terminal of the bandpass filter is connected to the lock-in amplifier, and the output terminal of the lock-in amplifier is connected to the ADC.

[0006] Preferably, the signal converter is model AD694.

[0007] Preferably, the frequency generator is model NE555.

[0008] Preferably, the transmitting and receiving radios are LoRa1000 models.

[0009] Preferably, the phase-locked loop is model ADF4258.

[0010] Preferably, the lock-in amplifier is a Stanford SR810.

[0011] Preferably, the bandpass filter is a Butterworth filter.

[0012] Preferably, the sensor is a TMR8531.

[0013] Preferably, the ADC is model AD7091R-5.

[0014] The beneficial effects of this utility model are:

[0015] (1) This utility model adopts the method of cathode protection pile, uses AC signal as the input current of pipeline sacrificial anode, and uses fixed AC as pipeline protection device, which can not only reduce material consumption, but also avoid the manpower consumption caused by regularly updating cathode material.

[0016] (2) The present invention uses a phase-locked loop to generate a frequency-multiplying signal based on the current signal provided to the pipeline by the system. This signal serves as the frequency selection signal for the bandpass filter, which can extract the signal of a specific frequency range of the data detected by the sensor. This can greatly reduce interference and noise, and greatly improve the stability and detection accuracy of the system.

[0017] (3) This utility model uses a lock-in amplifier to process the phase-locked loop and filter data, and extracts the amplitude and phase information of the signal through the phase-locked technology, thereby improving the signal-to-noise ratio and measurement accuracy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a phase-locked magnetic gradient buried pipeline non-destructive testing device according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided with reference to the accompanying drawings and embodiments.

[0020] This application discloses a phase-locked magnetic gradient buried pipeline non-destructive testing device, such as... Figure 1As shown, the system includes a cathode protection pile 1, a signal converter 2, a frequency generator 3, a transmitting radio station 4, a receiving radio station 5, a phase-locked loop 6, a lock-in amplifier 7, a bandpass filter 8, a sensor 9, and an ADC 10. One output of the frequency generator 3 is connected to the cathode protection pile 1 through the signal converter 2. The output of the cathode protection pile 1 is connected to a pipe. The other output of the frequency generator 3 is connected to the transmitting radio station 4. The output of the receiving radio station 5 is connected to the phase-locked loop 6. One output of the phase-locked loop 6 is connected to the bandpass filter 8. The other output of the phase-locked loop 6 is connected to the lock-in amplifier 7. The output of the sensor 9 is connected to the bandpass filter 8. The output of the bandpass filter is connected to the lock-in amplifier 7. The output of the lock-in amplifier 7 is connected to the ADC 10.

[0021] In one specific embodiment, the signal converter 2 is model AD694, the frequency generator 3 is model NE555, the transmitting radio station 4 and the receiving radio station 5 are model LoRa1000, the phase-locked loop 6 is model ADF4258, the lock-in amplifier 7 is model Stanford SR810, the bandpass filter 8 is model Butterworth filter, the sensor 9 is model TMR8531, and the ADC10 is model AD7091R-5.

[0022] Frequency generator 3 generates a frequency signal f. Signal converter 2 converts the voltage signal generated by the frequency generator into a current signal and transmits it to cathode protection pile 1. Cathode protection pile 1 directly applies this current signal to the pipeline to form a closed loop. The frequency signal f generated by frequency generator 3 is transmitted to transmitting radio station 4. Transmitting radio station 4 transmits the frequency signal f to receiving radio station 5 via radio frequency (RF). Receiving radio station 5 then transmits the frequency signal f to phase-locked loop 6. Based on the received frequency signal f, phase-locked loop 6 generates a signal f(ref) with the same frequency and phase and a harmonic signal Nf. Phase-locked loop 6 transmits the harmonic signal Nf to bandpass filter 8 as the frequency selection signal for bandpass filter 8. Sensor 9 monitors the magnetic gradient signal of the pipeline and transmits the magnetic gradient signal to bandpass filter 8. Bandpass filter 8 filters the magnetic gradient signal based on the frequency selection signal Nf provided by phase-locked loop 6. The lock-in amplifier 7 receives the frequency signal f(ref) generated by the phase-locked loop 6 and the magnetic gradient signal processed by the bandpass filter 8, respectively. It performs phase comparison and amplification on the two received signals to extract the required DC signal. The ADC10 performs analog-to-digital conversion on the output signal of the lock-in amplifier 7 and then outputs it.

[0023] This application employs a cathode protection pile 1 to apply a fixed current signal to the pipeline, and a phase-locked loop 6 generates in-phase and harmonic signals of the same frequency. A sensor 9 detects the magnetic gradient signal of the pipeline, and a filter 8 uses the harmonic signal to selectively filter the magnetic gradient signal. Then, a lock-in amplifier 7 processes the filtered signal and the in-phase signal transmitted by the phase-locked loop 6. This device can extract the magnetic gradient generated by the applied current from the acquired signal, thereby filtering out interference from environmental factors such as temperature and noise, greatly improving the resolution and accuracy of the detection. It provides a high-precision, high-resolution, and high-sensitivity effective device for the field of non-destructive testing of buried pipelines.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A phase-locked magnetic gradient buried pipeline non-destructive testing device, characterized in that, The device includes a cathode protection pile (1), a signal converter (2), a frequency generator (3), a transmitting radio station (4), a receiving radio station (5), a phase-locked loop (6), a lock-in amplifier (7), a bandpass filter (8), a sensor (9), and an ADC (10). One output of the frequency generator (3) is connected to the cathode protection pile (1) through the signal converter (2). The output of the cathode protection pile (1) is connected to a pipe. The other output of the frequency generator (3) is connected to the transmitting radio station (4). The output of the receiving radio station (5) is connected to the phase-locked loop (6). One output of the phase-locked loop (6) is connected to the bandpass filter (8). The other output of the phase-locked loop (6) is connected to the lock-in amplifier (7). The output of the sensor (9) is connected to the bandpass filter (8). The output of the bandpass filter is connected to the lock-in amplifier (7). The output of the lock-in amplifier (7) is connected to the ADC (10).

2. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 1, characterized in that, The signal converter (2) is model AD694.

3. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 2, characterized in that, The frequency generator (3) is model NE555.

4. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 3, characterized in that, The transmitting radio (4) and receiving radio (5) are LoRa1000 models.

5. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 4, characterized in that, The phase-locked loop (6) is model ADF4258.

6. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 5, characterized in that, The lock-in amplifier (7) is a Stanford SR810.

7. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 6, characterized in that, The bandpass filter (8) is a Butterworth filter.

8. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 7, characterized in that, The sensor (9) is model TMR8531.

9. The phase-locked magnetic gradient buried pipeline non-destructive testing device according to claim 8, characterized in that, The ADC (10) is model AD7091R-5.

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