Low-frequency detection of acoustic signals using fiber as an ultrasonic guide with a distant in-fiber Bragg grating
Low-frequency detection of acoustic signals using fiber as an ultrasonic guide with a distant in-fiber Bragg grating
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DOI：
10.1002/mop.31061
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发表时间：
2018-04-01
影响因子：
1.5
通讯作者：
Ribeiro, Ricardo M.
中科院分区：
文献类型：
--
作者：
Leal, Wescley A.;Carneiro, Mateus B. R.;Ribeiro, Ricardo M.
本文展示了低频超声波信号光子探测器的开发。这些信号随后到达敏感的单模光纤，作为声波导，将信号（约 43 kHz）传送到 70 厘米之外的远处受保护的光纤内布拉格光栅。光栅反射以 1550 nm 和 2.6 nm 带宽为中心的光谱，并在其线性和最敏感的区域由可调谐激光器进行询问。因此，实时无源通信解调或监测通过固体材料传播的超声波信号是可能的。该检测器还可以应用于其他物理介质。在这项研究中，还提出了一种新的无源技术来使光纤布拉格光栅（FBG）热脱敏，但该技术尚未经过实验测试。
This article shows the development of a photonic detector of low-frequency ultrasonic signals. These signals latter reach a sensitive single-mode optical fiber as an acoustic guide conveying the signals (around 43 kHz) over 70 cm to a distant and protected in-fiber Bragg grating. The grating reflects a spectrum centered around 1550 and 2.6 nm bandwidth and is interrogated by a tunable laser in their linear and most sensitive region. As a result, real-time passive demodulation of communication or monitoring of ultrasonic signals propagating through solid materials is possible. The detector may also be applied to other physical media. In this study, a new passive technique to thermally desensitize the fiber-Bragg gratings (FBG) is also proposed, though the proposed technique is not experimentally tested.