Abstract
Aviation cable is used to transmit electric energy and signal, and its performance directly affects the safety of aircraft. It is difficult to locate cable faults on aircraft and there is a lack of suitable high-precision detection equipment. Based on the Time-Domain Reflectometry Technology (TDR), combining with the embedded systems such as Raspberry Pi and FPGA, an aviation cable fault detector is designed. Firstly, based on the frequency-doubling clock generated by the PLL, the detector emits a low-voltage pulse whose width is smaller than the cycle of the source clock. Then, based on the multiple ADC sampling method, the detector samples the reflected pulse. Finally, the detector uses the intelligent algorithm to automatically determine the fault type and fault location, and displays the sampling waveform and detection results on the LCD screen. Through experimental verification, the detector can basically meet the requirements of aviation cable fault detection.
Highlights
Aviation cable is used to transmit electric energy and signal, and its performance directly affects the safety of aircraft
It is difficult to locate cable faults on aircraft and there is a lack of suitable high⁃precision detec⁃ tion equipment
Based on the Time⁃Domain Reflectometry Technology ( TDR), combining with the embedded sys⁃ tems such as Raspberry Pi and FPGA, an aviation cable fault detector is designed
Summary
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20213940770 针对上述问题,基于 TDR 技术设计了一种航空 电缆故障的可视化智能检测仪。 该检测仪以树莓派 和 FPGA 为主要硬件结构,配合高速 ADC 采样模块 和触摸电容屏,能够实现航空电缆故障的高精度检 测和检测结果的直观显示。 FPGA,该 FPGA 使用 ALTERA 公司的 Cyclone IV 系 列 芯 片, 内 置 PLL 和 FIFO, 时 钟 源 为 50 MHz。 FPGA 主要用于发射低压脉冲,提供 ADC 采样时钟 以及暂存 ADC 采样数据。 受 ADC 采样模块最大采样频率(65 MHz) 的限 制,无法直接通过对 50 MHz 时钟源倍频来提高采 样频率。 由 TDR 技术的原理可知,如果低压脉冲和 被测电缆均未改变,那么反射脉冲也是不变的。 因 此可以通过 PLL 对 50 MHz 时钟源进行相位偏移, 使用多重采样法对反射脉冲进行多轮采样,最后根 据采样顺序对数据进行排列,从而达到提高采样频 率的目的。
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