Laser ultrasonic weak defect signal detection based on Duffing oscillator

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Аннотация

This paper addresses the challenge in traditional laser ultrasonic methods, where the detection of surface defects in metal materials is often hindered by noise, and a novel approach that combines laser ultrasonics with Duffing oscillators to achieve a high signal-to-noise ratio for weak defect signals on metal surfaces is proposed. By leveraging the sensitivity of the Duffing oscillator’s chaotic system to initial conditions and its noise immunity, we can accurately identify the location of weak defects. Simulation results confirm the effectiveness and stability of this method for detecting surface defects in metal sheets.

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Авторлар туралы

Peng Hui

Jiujiang University

Email: 270401671@qq.com
ҚХР, Jiujiang, Jiangxi

Zeng Wei

Jiujiang University

Хат алмасуға жауапты Автор.
Email: 270401671@qq.com
ҚХР, Jiujiang, Jiangxi

Әдебиет тізімі

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2. Fig. 1. The phase trajectory of the Duffing system under the action of various driving forces.

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3. Fig 2. Laser ultrasonic signals obtained with various surface defects: without surface defects (a); 0.1×0.1 mm (b); 0.5×0.1 mm (c); 1.0×0.1 mm (d).

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4. Fig 3. The spectrum of the laser ultrasonic signal with and without surface defects.

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5. Fig 4. Lyapunov exponential curve and laser ultrasonic defect signals with different amplitudes: waveform without defects (a); 0.1×0.1 mm (b); 0.5×0.1 mm (c); 1.0×0.1 mm (d).

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6. Fig 5. The phase trajectory of the system and the Lyapunov exponent curve: chaotic state-2D (a); chaotic state-3D (b); Lyapunov exponent of the chaotic state (c); periodic state-2D (d); periodic state-3D (e); Lyapunov exponent of the periodic state (f).

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7. Fig 6. Lyapunov exponential curve and laser ultrasonic signal with noise waves of different intensity: without noise (a); noise intensity 0.1 (b); noise intensity 0.5 (c); noise intensity 1.0 (d).

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