Study on design of visual intelligent detection instrument for aviation cable fault

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.