Study of Defects in Carbon Fiber Reinforced Composites Visualized by Magnetic Induction Tomography

Meng, Qifeng; Song, Kai; Zhang, Lipan; Ning, Ning; Huang, Huabin

doi:10.1080/09349847.2020.1745340

Cited by 1 publication

(1 citation statement)

References 22 publications

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“…Although CFRP have excellent properties, defects may occur during production or due to external environmental factors. The complexity of CFRP processing and factors such as low molecular impurities in the prepreg, solvents, and moisture volatilization can contribute to the formation of these defects [5]. These defects, such as voids, cracks, and delaminations, can significantly reduce the serviceability of the component and shorten its life.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Micro Signal Detection Circuit for Magnetic Field Detection Utilizing Coil Sensors

Xu,

Zhang,

et al. 2024

Applied Sciences

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Eddy current inspection has been extensively employed in non-destructive testing of various conductive materials. The coil probe, as a mainstream sensor in the eddy current detection system, inevitably encounters interference from external signals while transmitting its own signal. Therefore, developing techniques to extract valuable signals from noisy ones is crucial for ensuring accurate detection. Carbon fiber composites not only possess significantly lower electrical conductivity compared to conventional metallic materials but also exhibit notable anisotropy. To address this issue, we designed an ‘8’ coil probe set where the excitation coil does not electromagnetically interfere with the detection coil. However, practical applications that require portability and miniaturization pose challenges when utilizing this coil probe set to identify carbon content or defects due to the typically weak output signal. To address this issue, this paper proposes a design that combines the ‘8’ structure of the planar coil probe with the principle of phase-locked amplification to create a dual-phase sensitive phase-locked amplification detection circuit. These specific design ideas were tested using a weak signal, which passed through the preamplifier, secondary amplifier, and band-pass filter comprising the target channel for signal amplification and noise filtering. The effective signal amplitude is proportional to the inverse phase difference between the direct current (DC) signal and inversely proportional to the amplitude of the signal. Finally, the DC signal was passed through an analog-to-digital converter (ADC). The analog-to-digital converter (A/D) is used to collect and calculate the DC signal, enabling the detection of weak electrical signals. Simulation experiments demonstrated that the signal detection circuit has an amplitude error below 0.2% and a phase error below 0.5%. The phase-locked amplification circuit designed in this paper can effectively extract the tiny impedance change signals of the planar coil sensor probe with high sensitivity and good robustness.

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Section: Introductionmentioning

confidence: 99%