Pressure Sensitivity of a Fiber-Optic Microprobe for High-Frequency Ultrasonic Field
Pressure Sensitivity of a Fiber-Optic Microprobe for High-Frequency Ultrasonic Field
复制标题
高频超声场光纤微探头的压力灵敏度
DOI：
10.1143/jjap.38.3120
复制
发表时间：
1999
影响因子：
1.5
通讯作者：
Kentaro Nakamura
中科院分区：
文献类型：
--
作者：
Y. Uno;Kentaro Nakamura
需要一种具有良好空间分辨率的声学微探头来测量高频超声场。我们在之前的研究中提出了一种光纤微探针，它由在光纤末端制作一个100µm长的小光腔组成。通过施加的声场改变腔体的光程长度，在光纤的另一端监测输出光强的调制以导出声场信息。本文从理论上和实验上对光纤微探针的压力敏感性进行了探讨。采用有限元法计算了声压作用下光学腔的力学变形，分析了声压作用下光学腔的力学变形对低精密度微腔光学性能的影响。
An acoustic microprobe is required to measure high-frequency ultrasonic fields with good spatial resolution. An optical fiber microprobe was proposed in our previous study, which consists of a small optical cavity 100 µm long made at the end of the fiber. The optical path length of the cavity is changed by the applied acoustic field, and the modulation of output light intensity is monitored at the other end of the fiber to derive information of the acoustic field. In the present study, the pressure sensitivity of the fiber-optic microprobe is discussed theoretically and experimentally. Mechanical deformation of the optical cavity by acoustic pressure is calculated by the finite element method (FEM), and the effect of the deformation on the optical property is analyzed for a low finesse microcavity.