Detection of cracks with arbitrary orientations in a metal pipe using linearly-polarized circular TE11 mode microwaves

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

doi:10.1016/j.ndteint.2019.102125

Cited by 16 publications

(6 citation statements)

References 25 publications

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“…On the contrary, linearly-polarized circular TE 11 mode microwaves have a circumferential field variation and both the axial and circumferential components of surface current density. In [25], a dual-bend TM 01 -TE 11 mode convertor was designed to generate linearly-polarized TE 11 mode microwaves for detecting both circumferential and axial cracks. However, a cross section at the pipe end is needed for that mode converter to inject microwaves, which limits its application to complicated pipe systems.…”

Section: Introductionmentioning

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.

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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: Introductionmentioning

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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“…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]. YU YT et al established a finite integral numerical model to analyze the relationship between the reflection coefficient phase and the defect edge position [23].…”

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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“…crack detection including coaxial probes, open-ended waveguides, and time-reversal techniques. Extensive published works have focused on crack detection, crack sizing, and crack imaging [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Although these technologies are easy to implement, they all require accurate measuring of signal properties including frequency, amplitude, and phase.…”

Section: Introductionmentioning

confidence: 99%

Simplistic, Efficient, and Low-Cost Crack Detection of Dielectric Materials Based on Millimeter-Wave Interference

Chen

Yin

et al. 2022

Electronics

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This paper proposes a simplistic, efficient, and low-cost method of millimeter-wave nondestructive testing (NDT) of dielectric material cracks based on millimeter-wave interference. A relationship between combining efficiency, phase difference, and amplitude difference was analyzed. We found that phase difference was the main factor that affects combining efficiency. A change in combining efficiency of more than 1% was caused by a phase-difference altering of greater than 1.2° in a specific range. A relevant model was simulated with CST, and the operating frequency and antenna spacing were optimized to enhance sensitivity of the measuring system. Then, a Ka-band NDT system was built to test the combining efficiencies of different cracks. The experimental results showed that for polytetrafluoroethylene (PTFE) plates with a thickness of 5 mm, cracks with a width of about 0.4 mm, which is about 0.07 λg, could be detected at 35 GHz. Experimental results, simulation results, and theoretical derivation are basically consistent. Large-scale online applications of this NDT method in various industries appear feasible due to the above characteristics.

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Detection of cracks with arbitrary orientations in a metal pipe using linearly-polarized circular TE11 mode microwaves

Cited by 16 publications

References 25 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

Metal Surface Defect Detection Method Based on TE01 Mode Microwave

Simplistic, Efficient, and Low-Cost Crack Detection of Dielectric Materials Based on Millimeter-Wave Interference

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Detection of cracks with arbitrary orientations in a metal pipe using linearly-polarized circular TE11 mode microwaves

Cited by 16 publications

References 25 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

Metal Surface Defect Detection Method Based on TE01 Mode Microwave

Simplistic, Efficient, and Low-Cost Crack Detection of Dielectric Materials Based on Millimeter-Wave Interference

Contact Info

Product

Resources

About

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