A new kind of metal detector based on chaotic oscillator

1st International Global on Renewable Energy and Development

Hu, Wenjing^1

School of Electrical Engineering, Shandong University, Jinan, Shandong, China^1

关键词: Chaotic oscillators;    Detector sensitivity;    Duffing oscillator;    High frequency HF;    Periodic signal;    Quantitative criteria;    Simulation model;    Sinusoidal signals;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/100/1/012186/pdf
DOI  :  10.1088/1755-1315/100/1/012186

来源: IOP

【 摘 要 】

The sensitivity of a metal detector greatly depends on the identification ability to weak signals from the probe. In order to improve the sensitivity of metal detectors, this paper applies the Duffing chaotic oscillator to metal detectors based on its characteristic which is very sensitive to weak periodic signals. To make a suitable Duffing system for detectors, this paper computes two Lyapunov characteristics exponents of the Duffing oscillator, which help to obtain the threshold of the Duffing system in the critical state accurately and give quantitative criteria for chaos. Meanwhile, a corresponding simulation model of the chaotic oscillator is made by the Simulink tool box of Matlab. Simulation results shows that Duffing oscillator is very sensitive to sinusoidal signals in high frequency cases. And experimental results show that the measurable diameter of metal particles is about 1.5mm. It indicates that this new method can feasibly and effectively improve the metal detector sensitivity.