Strain Sensor Based on Fiber Ring Cavity Laser With Photonic Crystal Fiber In-Line Mach-Zehnder Interferometer
Strain Sensor Based on Fiber Ring Cavity Laser With Photonic Crystal Fiber In-Line Mach-Zehnder Interferometer
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DOI：
10.1109/jphot.2014.2332454
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发表时间：
2014-08-01
影响因子：
2.4
通讯作者：
Zeng, Xianglong
中科院分区：
文献类型：
--
作者：
Bai, Xuekun;Fan, Dengfeng;Zeng, Xianglong
实验设计了一种基于光纤环形腔激光器的应变传感器，该传感器采用光子晶体光纤（PCF）直线马赫-曾德尔干涉仪（MZI）结构，作为光带通滤波器并作为应变传感元件。光纤环形腔激光器的作用是增强谐振光谱的可见性，缩小相应的3db带宽，从而提高综合传感性能。通过监测激光输出的中心波长来测量结构上的诱导轴向应变。在0-2100 mu epsilon线性应变范围内，成功实现了2.1 pm/ mu epsilon的高应变传感灵敏度。引入了描述整体传感性能的参数Q值，包括应变传感灵敏度、相对于谐振频谱3db带宽的传感灵敏度和相应的可见性。与已有报道的基于PCF直线MZI结构的应变测量结果相比，基于光纤环形腔激光传感器的实验结果Q值提高了9倍以上。
We experimentally demonstrated a strain sensor based on fiber ring cavity laser with a photonic crystal fiber (PCF) in-line Mach-Zehnder interferometer (MZI) structure, which is used as an optical band-pass filter and acts as the strain sensing component. The fiber ring cavity laser plays the role of enhancing the visibility of the resonant spectrum and narrowing the corresponding 3-dB bandwidth, thus improving the comprehensive sensing performance. The induced axial strain on the structure is measured by monitoring the central wavelengths of the laser output. A high strain sensing sensitivity of 2.1 pm/ mu epsilon is successfully achieved in the linear strain range of 0-2100 mu epsilon. A parameter Q value describing the overall sensing performance is introduced by including the strain sensing sensitivity, sensing sensitivity relative to 3-dB bandwidth of the resonant spectrum and the corresponding visibility. Comparing with the reported strain measurements based on a PCF in-line MZI structure, the experimental results based on fiber ring cavity laser sensor present more than nine times larger Q value.