Thin film metal coated fiber optic hydrophone probe.
Thin film metal coated fiber optic hydrophone probe.
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DOI：
10.1364/ao.48.000g77
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发表时间：
2009-11-01
期刊：
影响因子：
1.9
通讯作者：
Lewin PA
中科院分区：
文献类型：
--
作者：
Gopinath Minasamudram R;Arora P;Gandhi G;Daryoush AS;El-Sherif MA;Lewin PA
本工作的目的是提高光纤传感器的灵敏度性能的光纤水听器探头（FOHP）的纳米尺度薄膜镀金。该光纤设计为通过蚀刻到约9 μm的有效直径来提供高达100 MHz的均匀和空间平均的自由响应。在1.5 MHz至20 MHz的频率范围内，在声压幅度水平高达6 MPa的情况下，比较了直劈（即全尺寸芯和包层）未涂覆、锥形未涂覆和锥形薄膜金涂覆光纤传感器的灵敏度性能。通过优化金涂层厚度，测得薄膜金涂层FOHP前所未有的电压灵敏度为−245 dB re 1V/uPa（560 mV/ MPa）。
The purpose of this work was to improve on sensitivity performance of fiber sensor employed as Fiber Optic Hydrophone Probe (FOHP) by nano-scale thin film gold coating. The fiber is designed to provide a uniform and spatial averaging free response up to 100 MHz by etching down to an active diameter of about 9 μm. The sensitivity performance of straight cleaved (i.e. full size core and cladding) uncoated, tapered uncoated and tapered thin film gold coated fiber sensors were compared in the frequency range of 1.5 MHz to 20 MHz in the presence of acoustic pressure amplitude levels of up to 6 MPa. An unprecedented voltage sensitivity of −245 dB re 1V/uPa (560 mV/ MPa) was measured for thin film gold coated FOHP by optimizing the gold coating thickness.