CAJ | 학술논문

该文采用自主研发的一套非接触、高精度的激光超声实验系统,对脉冲激光在薄铝板中激发的超声表面波信号进行了实验研究.利用调Q脉冲激光器在铝板样品中激发超声表面波信号,超声表面波由激光多普勒测振计接收,接入示波器,记录与超声振动对应的电信号;同时光电探测器接收样品表面的反射光信号提供时间原点的参考接入示波器.实验中测得的波形具有典型的表面波对心、双极的特点,表明该实验系统能够激发并接收到性能良好的超声表面波;对实验数据进行提取、处理和分析,得到表面波在铝板中的传播速度,与理论解吻合良好,表明该实验方法在超声表面波波速测量上有很高的精度和应用前景.
해문채용자주연발적일투비접촉、고정도적격광초성실험계통,대맥충격광재박려판중격발적초성표면파신호진행료실험연구.이용조Q맥충격광기재려판양품중격발초성표면파신호,초성표면파유격광다보륵측진계접수,접입시파기,기록여초성진동대응적전신호;동시광전탐측기접수양품표면적반사광신호제공시간원점적삼고접입시파기.실험중측득적파형구유전형적표면파대심、쌍겁적특점,표명해실험계통능구격발병접수도성능량호적초성표면파;대실험수거진행제취、처리화분석,득도표면파재려판중적전파속도,여이론해문합량호,표명해실험방법재초성표면파파속측량상유흔고적정도화응용전경.
This article usesof a set of non-contact,high precision laser ultrasonic experiment system which was independent research and developed .The pulse laser excitation in the thin aluminum plate surface of the ultrasonic wave signal has carried on the experimental study. Using the pulse tuning-Q laser in aluminum plate samples inspire ultrasonic surface wave signals ,Ultrasonic surface wave received by the doppler vibration meter, and the oscilloscope records the corresponding electrical signals which caused by ultrasonic vibration. And photoelectric detector as reference time the origin of the reflected light signal of sample surface access to the oscilloscope. Experiments of measured waveform as the typical surface wave characteristics of central and bipolar, which shows that the experiment system can motivate and receives the good performance of the ultrasonic surface wave .By extracting, processing and analyzing to experimental data, we got that the propagation velocity of surface wave in the aluminum plate is good agree with the theoretical solution .This conclusion indicates that the experimental method which measures the ultrasonic surface wave velocity has high precision and application prospect.