Ma Ming, Liu Shiyu, Zhang Ronghua, Zhang Qiong, Wu Yi, Chen Bailiang
School of Life Sciences, Tiangong University, Tianjin 300387, China.
School of Control Science and Engineering, Tiangong University, Tianjin 300387, China.
Sensors (Basel). 2024 May 27;24(11):3449. doi: 10.3390/s24113449.
Eddy current testing (ECT) is commonly used for the detection of defects inside metallic materials. In order to achieve the effective testing of CFRP materials, increasing the operating frequency or improving the coil structure is a common method used by researchers. Higher or wider operating frequencies make the design of the ADC's conditioning circuit complex and difficult to miniaturize. In this paper, an LC resonator based on inductance-to-digital converters (LDCs) is designed to easily detect the resonant frequency response to the state of the material under test. The reasonableness of the coil design is proven by simulation. The high signal-to-noise ratio (SNR) and detection sensitivity of the LC resonator are demonstrated through comparison experiments involving multiple probes. The anti-interference capability of the LC resonator in CFRP defect detection is demonstrated through various interference experiments.
涡流检测（ECT）通常用于检测金属材料内部的缺陷。为了实现对碳纤维增强复合材料（CFRP）材料的有效检测，提高工作频率或改进线圈结构是研究人员常用的方法。更高或更宽的工作频率会使模数转换器（ADC）的调理电路设计变得复杂且难以小型化。本文设计了一种基于电感数字转换器（LDC）的LC谐振器，以轻松检测对被测材料状态的谐振频率响应。通过仿真证明了线圈设计的合理性。通过涉及多个探头的对比实验，证明了LC谐振器的高信噪比（SNR）和检测灵敏度。通过各种干扰实验，证明了LC谐振器在CFRP缺陷检测中的抗干扰能力。
