Sakoda Tatsuya, Sonoda Yoshito
Department of Electrical System and Computer Engineering, Sojo University, Kumamoto 860-0082, Japan.
IEEE Trans Ultrason Ferroelectr Freq Control. 2006 Apr;53(4):761-7.
An acoustic fiber sensor for measurement of ultrasonic waves, which used the approximate Raman-Nath diffraction effect where light diffraction waves were generated in an optical fiber by strain due to the ultrasonic waves, was proposed and examined. In order to characterize the acoustic fiber sensor as a basic study, measurements of low-frequency ultrasonic waves in water were examined using a step index fiber operating as a detection sensor. The results showed that characteristics of detected signals agreed with the theoretical prediction based on Fraunhofer diffraction. This indicates that our proposed fiber sensor can be used for the detection of low-frequency ultrasonic waves as well as the transmission of light diffraction signals.
提出并研究了一种用于测量超声波的声学光纤传感器，该传感器利用了近似拉曼-纳特衍射效应，即超声波引起的应变在光纤中产生光衍射波。作为一项基础研究，为了表征该声学光纤传感器，使用阶跃折射率光纤作为检测传感器对水中的低频超声波进行了测量。结果表明，检测信号的特性与基于夫琅禾费衍射的理论预测相符。这表明我们提出的光纤传感器可用于检测低频超声波以及光衍射信号的传输。
