CAJ | 학술논문

针对在役化工金属管道因腐蚀而产生管壁减薄的现象，研究了超声波腐蚀检测技术，实现管道腐蚀的定点周期性监测。基于超声波脉冲反射法测厚原理，提出了超声波管道腐蚀监测系统具体的设计方案。采用高速电压比较器结合时间数字转换芯片TDC－GP21构成数据处理单元，实现管道壁厚的高精度测量。采用滞回式电压比较电路，输出信号的上升沿陡峭、噪声小；时间测量电路输出的时间测量值由LCD液晶屏显示，分辨率为0．0001μs；计算分析得出，管道厚度测量平均误差小于1％；系统多次测量的重复性较好。
침대재역화공금속관도인부식이산생관벽감박적현상，연구료초성파부식검측기술，실현관도부식적정점주기성감측。기우초성파맥충반사법측후원리，제출료초성파관도부식감측계통구체적설계방안。채용고속전압비교기결합시간수자전환심편TDC－GP21구성수거처리단원，실현관도벽후적고정도측량。채용체회식전압비교전로，수출신호적상승연두초、조성소；시간측량전로수출적시간측량치유LCD액정병현시，분변솔위0．0001μs；계산분석득출，관도후도측량평균오차소우1％；계통다차측량적중복성교호。
In term of the thinning phenomenon of in-service chemical metal pipelines wall due to corrosion,to realize the fixed-point periodic monitoring of pipeline corrosion,the system of ultrasonic corrosion monitoring was studied.Based on the principle of ultrasonic thickness measurement,the concrete design plan was proposed.To realize high-precision measurement of pipe wall thick-ness,high-speed voltage comparator combined with time-digital converter chip TDC-GP21 was used to constitute data processing u-nit.The hysteresis-type voltage comparator circuit was used,so the rising edge of the output signal was abrupt and of low noise;Time measurement output by time measuring circuit was displayed by LCD and the resolution ratio was 0.000 1μs.Calculation and analysis prove that the average measurement error of the thickness is less than 1%and the system's repeatability of repeated meas-uring is excellent.