Fiber-optic ultrasonic hydrophone using short Fabry-Perot cavity with multilayer reflectors deposited on small stub
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- 作者：Kyung-Su Kim ; Yosuke Mizuno ; Kentaro Nakamura
- 关键词：Ultrasonic hydrophone ; Optical fiber sensor ; Band-pass filter ; Dielectric multilayer film ; Fabry&ndash ; Perot resonator
- 刊名：Ultrasonics
- 出版年：April, 2014
- 年：2014
- 卷：54
- 期：4
- 页码：1047-1051
- 全文大小：1274 K
文摘
A fiber-optic probe with dielectric multilayer films deposited on a small stub is studied for mega-hertz ultrasonic-wave detection in water. The small stub with a short Fabry-Perot cavity and distributed reflectors is attached on the fiber end. The structure is mechanically strong and withstands intense ultrasonic pressure. Ultrasonic waves at 1.56 MHz are successfully detected in water with a good signal-to-noise ratio. The working principle and the characteristics are studied by comparing the ultrasonic sensitivity with that of a conventional piezoelectric hydrophone. The distance response and directional response are also investigated.