Multichannel eddy current nondestructive testing system based on Zynq
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摘要: 针对金属试件表面缺陷的检测,设计了一套金属表面缺陷检测系统。该系统通过AD 9767芯片利用DDS (直接数字式频率合成器)算法输出幅值和频率可控的正弦信号给激励线圈,激励线圈中的高频激励信号可以使感应线圈激发出同频率的感应信号,通过AD 9240芯片采集激励和感应线圈的电压信号并送到FPGA (现场可编程逻辑门阵列)部分,再利用数字相敏检波算法分解获得的感应电压以得到实部和虚部,进而得到感应线圈的有效复阻抗。利用MAX 4656和ADG 408芯片模拟开关分别控制激励通道和数模采集通道的开关,以扩大通道数,通过试验验证硬件和算法的可行性。结果表明,此系统可以产生幅度和频率可控的正弦激励信号,并可对输入通道的感应信号进行阻抗分解,得到感应信号的幅值、相位、实部和虚部。Abstract: Aiming at the detection of metal surface defects, a set of metal surface defect detection system is designed. The system uses DDS (Direct digital frequency synthesis) algorithm to output sinusoidal signal with controllable amplitude and frequency to the excitation coil through AD 9767 chip. The high-frequency excitation signal in the excitation coil can excite the induction signal in the same frequency in the induction coil. The voltage signals of the excitation and induction coils are collected to FPGA(Field programmable gate array)through AD 9240 chip, and then the real and imaginary parts of the acquired induction voltage are decomposed by digital phase sensitive detection algorithm, and the effective complex impedance of the induction coil can hence be obtained. MAX 4656 chip and ADG 408 chip analog switch are used to control the switches of excitation channel and AD acquisition channel respectively to expand the number of channels. Experiments were performed to verify the feasibility of hardware and algorithm. Finally, the experimental results show that the system can generate sinusoidal excitation signal with controllable amplitude and frequency, and decompose the induced signal of the input channel to obtain the amplitude, phase, real part and imaginary part of the induced signal.
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