CAJ | 학술논문

文中通过激光超声激发过程理论模型，获得激光超声信号的波形特点，并分析相关参数对激发超声信号的影响。应用两种不同的激光超声探测方法对激光超声信号进行探测，即分别采用超声探头和基于双波混合干涉的光学探测方式搭建两种实验装置。实验针对入射激光参数对激发超声信号的影响及两种探测方法获得激光超声信号的特点进行分析。通过实验验证了理论分析结果，得出入射激光参数会影响激发超声的幅度，而基于双波混合干涉的光学探测方式可以获得更为完整的超声波形信息。
문중통과격광초성격발과정이론모형，획득격광초성신호적파형특점，병분석상관삼수대격발초성신호적영향。응용량충불동적격광초성탐측방법대격광초성신호진행탐측，즉분별채용초성탐두화기우쌍파혼합간섭적광학탐측방식탑건량충실험장치。실험침대입사격광삼수대격발초성신호적영향급량충탐측방법획득격광초성신호적특점진행분석。통과실험험증료이론분석결과，득출입사격광삼수회영향격발초성적폭도，이기우쌍파혼합간섭적광학탐측방식가이획득경위완정적초성파형신식。
The physical mechanisms of ultrasonic generation by laser pulse, the waveform characteristics of the generated laser ultrasonic signal and the influence of laser parameters on the ultrasonic signal were analysed theoretically. And two experimental apparatus were built that received laser ultrasonic with a piezoelectric ultrasonic transducer or an optical detection method based on two-wave mixing interference to verify the theoretical analysis results. In the experiment, the influence of the pulse laser parameters and the characteristic of the detected signals with two different detection method were analysed. Through theoretical analysis and experimental verification, the generated ultrasonic amplitude can be affected by the incoming laser parameters, and optical detection method based on two-wave mixing interference can detect complete laser ultrasonic waveform information.