Demonstration of detection of the multiple pipe wall thinning defects using microwaves

Katagiri, Takuya; Chen, Guanren; Yusa, Noritaka; Hashizume, Hidetoshi

doi:10.1016/j.measurement.2021.109074

Cited by 14 publications

(5 citation statements)

References 15 publications

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“…The microwave signals with different frequencies will be distorted with the propagation distance along the pipe since the phase velocities of the TE 11 mode microwaves are different for different frequencies. To suppress this influence and obtain the explicit reflection signals, a signal processing method [13,29] was employed to compensate for the phase difference due to different phase velocities. The phase difference ∆ϕ due to the dispersion of microwaves traveling a distance of L p can be calculated by…”

Section: Experimental System and Signal Processing Methodsmentioning

confidence: 99%

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Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection

Guo

Yoshikawa

Yusa

et al. 2023

Meas. Sci. Technol.

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This study proposed a simple side-incident TE11 mode microwave probe for the rapid and long-range inspection of cracks in metallic pipes. The probe feeds the microwaves to a metallic pipe, which works as a waveguide; the reflection signal provoked by a defect is measured for detection and localization. The probe enables the detection of both circumferentially and axially oriented cracks, unlike those reported in earlier studies. To achieve better performance, numerical simulations were conducted to evaluate the conversion efficiency and optimize the insertion length of the coaxial cable and the exposed length of the cable core wire. The simulation results suggest that the optimized probe configuration is feasible for pipes with various diameters by proportionally changing the current probe configuration. Although injected microwaves propagated in two directions, the ratio of microwaves to one direction could be controlled by adjusting the inclination angle and the exposed length of the cable core wire. Subsequently, three TE11 probes fabricated according to the simulation results were used to detect circumferential and axial slits in a brass pipe. The results showed that circumferential slits in the vertical positions (parallel to the nontilted coaxial cable) and axial slits in the horizontal positions (perpendicular to the nontilted coaxial cable) caused large reflections, consistent with the electromagnetic field distribution of the TE11 mode microwaves in a circular waveguide. Further experiments verified the feasibility of the designed probe for pipes with different diameters and for directional pipe inspection.

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Section: Experimental System and Signal Processing Methodsmentioning

confidence: 99%

“…Finally, a 'distance-domain' signal can be obtained. Its detail can be found in [29], while a flowchart of principle is shown in figure 8.…”

Section: Experimental System and Signal Processing Methodsmentioning

confidence: 99%

Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection

Guo

Yoshikawa

Yusa

et al. 2023

Meas. Sci. Technol.

Self Cite

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“…It is possible to apply this approach to other insulated or difficult-to-access test objects, where no contact with the probe is required [81]. Other methods, such as RFID (radio frequency identification) [75], as well as microwave-based sensors [75,84], have attracted interest as novel diagnostic techniques for online monitoring of structural materials' integrity in the process industry, especially in the context of the development of so-called industry 4.0 [75].…”

Section: Methods Employing the Magnetic And Electromagnetic Fieldsmentioning

confidence: 99%

Non-Destructive Diagnostic Methods for Fire-Side Corrosion Risk Assessment of Industrial Scale Boilers, Burning Low Quality Solid Biofuels—A Mini Review

Hardy

Arora²,

Pawlak-Kruczek

et al. 2021

Energies

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The use of low-emission combustion technologies in power boilers has contributed to a significant increase in the rate of high-temperature corrosion in boilers and increased risk of failure. The use of low quality biomass and waste, caused by the current policies pressing on the decarbonization of the energy generation sector, might exacerbate this problem. Additionally, all of the effects of the valorization techniques on the inorganic fraction of the solid fuel have become an additional uncertainty. As a result, fast and reliable corrosion diagnostic techniques are slowly becoming a necessity to maintain the security of the energy supply for the power grid. Non-destructive testing methods (NDT) are helpful in detecting these threats. The most important NDT methods, which can be used to assess the degree of corrosion of boiler tubes, detection of the tubes’ surface roughness and the internal structural defects, have been presented in the paper. The idea of the use of optical techniques in the initial diagnosis of boiler evaporators’ surface conditions has also been presented.

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“…JU Y et al established a microwave resonance model, analyzed the microwave signal in the time domain, and evaluated the thinning of the pipeline [14,15]. Katagiri T et al analyzed the TEM-mode/TE01-mode conversion, and the microwave reflection was related to the transmission frequency, the size of the transmission line, the electromagnetic properties, and the roughness of the material surface [16][17][18]. Chen G et al designed two TEM-TM01 and TEM-TM02 incident probes to obtain better propagation mode purity and propagation directionality, detect defects in different orientations, and analyze the influence of propagation mode conversion at bends on detection signals [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Metal Surface Defect Detection Method Based on TE01 Mode Microwave

Shi

Yang

Gao

et al. 2022

Sensors

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With the aim of addressing the difficulty of detecting metal surface cracks and corrosion defects in complex environments, we propose a detection method for metal surface cracks and corrosion defects based on TE01-mode microwave. The microwave detection equations of cracks and corrosion defects were established by the Maxwell equations when the TE01 mode was excited by microwaves, and the relationship model between the defect size and the microwave characteristic quantity was established. A finite integral simulation model was established to analyze the influence of defects on the microwave electric field, magnetic field, and tube wall current in the rectangular waveguide, as well as the return loss at the defect; an experimental platform for the detection of metal surface cracks and corrosion defects was built. The absolute value of the return loss of the microwave reflected wave increased, and with the increase of the defect width, the microwave detection frequency at the defect decreased. The TE01-mode microwave has good detection ability for metal surface cracks and corrosion defects and can effectively detect cracks with a width of 0.3 mm.

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Demonstration of detection of the multiple pipe wall thinning defects using microwaves

Cited by 14 publications

References 15 publications

Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection

Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection

Non-Destructive Diagnostic Methods for Fire-Side Corrosion Risk Assessment of Industrial Scale Boilers, Burning Low Quality Solid Biofuels—A Mini Review

Metal Surface Defect Detection Method Based on TE01 Mode Microwave

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Demonstration of detection of the multiple pipe wall thinning defects using microwaves

Cited by 14 publications

References 15 publications

Design of a simple side-incident TE11 mode microwave probe for nondestructive pipe inspection

Design of a simple side-incident TE11 mode microwave probe for nondestructive pipe inspection

Non-Destructive Diagnostic Methods for Fire-Side Corrosion Risk Assessment of Industrial Scale Boilers, Burning Low Quality Solid Biofuels—A Mini Review

Metal Surface Defect Detection Method Based on TE01 Mode Microwave

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Product

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Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection

Design of a simple side-incident TE₁₁ mode microwave probe for nondestructive pipe inspection