摘要
研究了基于ARM和FPGA的数字式超声波探伤电路系统,运用MOSFET开关I/V特性推导出阈值电压和漏极电流公式,推导了电容充放电时间以及运用极限法来分析发射电路中电容电阻因素。并对发射电路进行仿真设计及分析,实现了FPGA对发射电路的控制。最后从超声波探伤实用性角度分析了发射电路参数对探伤系统性能的影响。研究结论表明,MOFSET开关和电容充放电中电压、电阻、电容等影响发射电路性能的因素合理取值提高了超声波探伤系统的能力。
Based on ARM and FPGA for the transmitting circuit system in digital ultrasonic inspection, threshold voltage and drain current formula were deduced by using the MOSFET switch I/V theory. The resistance factors of transmitting circuit were ap- plied for limit analysis method and capacitance time, and the charging and discharging time was deduced. Transmitting circuit was simulated and analyzed to realize FPGA control. The effection of transmitting circuit parameters for inspection system performance was analyzed from the practical agent. It can be concluded that MOSFET switch and the factors of charging and discharging capaci- tor circuit, such as voltage, resistance and capacitance, which might influent transmitting circuit performance, will improve the capa- bilities of shear inspection system.
出处
《仪表技术与传感器》
CSCD
北大核心
2012年第9期30-32,共3页
Instrument Technique and Sensor
