摘要
分析超声波检测残余应力的基本机理,应用临界角折射法解决了应力检测中声速测量的关键难题。采用单片机结合CPLD驱动换能器,同时在信号处理中以双通道区分信号,提高了测量精度。通过CPLD外接高频振荡器,组成高频计数电路,比较好地解决了ns级计数难点。进一步研制出残余应力的超声波检测系统。
According to the theory of testing stress by ultrasonic, key problem of measuring velocity was solved by use of the ultrasonic critical-angle refractomery. Adopting SCM and CPLD to control transducer, precision was improved by use of two tunnels processed signal respectively. With a high frequency oscillator connect to CPLD, high frequency counter which is availability to count precise was got. In the end an ultrasonic stress device was developed.
出处
《仪表技术与传感器》
CSCD
北大核心
2006年第9期13-14,21,共3页
Instrument Technique and Sensor
