【摘 要】
：
We propose a high sensitivity sensor based on a mode number-encoded multi-longitudinal mode fiber laser. The fiber laser incorporates a uniform fiber Bragg grating (FBG) and a fiber Fabry-Perot interferometer (FFPI) as sensitive components in the cavity.
【出 处】
：
ChineseOpticsLetters
论文部分内容阅读
We propose a high sensitivity sensor based on a mode number-encoded multi-longitudinal mode fiber laser. The fiber laser incorporates a uniform fiber Bragg grating (FBG) and a fiber Fabry-Perot interferometer (FFPI) as sensitive components in the cavity. The sensor counts the number of longitudinal modes (NLM) of fiber laser, which is caused by the mismatch between the reflection band of FBG and the transmission band of FFPI resulting from the application of external perturbation to the FBG. An electrical spectrum analyzer is adopted to analyze the NLM. The strain sensor is experimentally demonstrated to have sensitivity of as high as 0.02 \mu \varepsilon/mode.
其他文献
人类社会信息技术的快速发展不仅使得信息传递更加快捷,同时也对信息数据的存储产生了巨大的需求。如何对呈指数化增加的数据进行高速可靠、低能耗、低成本的长期存储已成为信息社会继续发展亟需解决的难题。为此,介绍了以玻璃为存储介质的光存储技术的发展现状,总结了玻璃介质光存储的应用方案,并对以玻璃作为存储介质的光存储技术未来发展趋势进行了展望。
为研究激光冲击与喷丸复合强化对TC4钛合金疲劳性能的影响,在测试不同强化工艺状态(未强化状态、喷丸强化状态、激光冲击强化状态、激光冲击与喷丸复合强化状态)TC4钛合金表面残余应力的基础上,进行了细节疲劳额定强度截止值(DFRcutoff)试验,并利用ABAQUS有限元仿真分析其表层残余应力分布。试验结果表明:复合强化TC4钛合金的表面残余压应力和DFRcutoff最大,相比于未强化状态分别提高了189.1%和62.3%。仿真结果表明:表面处理会在试样表面形成残余压应力,激光冲击与喷丸复合强化状态试样的表面
采用新式泵浦系统和低损失的汞灯，可以延长红宝石激光器的使用寿命，也可提高它的重复率，这样，就有可能使红宝石激光器从实验室的仪器变为生产的工具。
Metasurfaces have been used to realize optical functions such as focusing and beam steering. They use subwavelength nanostructures to control the local amplitude and phase of light. Here we show that such control could also enable a new function of artifi
Wired local network is used widely in a vehicle. It brings the benefits of sharing information and controlling automatically as well as causes negative reaction and a troublesome problem to vehicle such as weight, cost, electromagnetism and space and so o
In this paper, we present a detailed comparison of applying three advanced modulation formats including carrierless amplitude and phase modulation (CAP), orthogonal frequency division multiplexing (OFDM), and discrete Fourier transform spread orthogonal f
为了研究光学表面制造残差对成像系统性能的影响,提出了基于光学系统出瞳位相差的空间频段误差划分方法,推导出了统计意义下的中频(MSF)误差对调制传递函数(MTF)的影响函数解析式,确定了MTF 受中频误差影响的特征分辨率.对比低频(LSF)误差与MSF 误差影响的区别，MSF 误差导致系统调制传递函数从低分辨率处开始迅速下降,并根据中频影响函数解析式得到MSF 误差导致MTF 曲率突变特征分辨率.
We present an image recognition method to distinguish targets with cat-eye effect from the dynamic background based on target shape and modulation frequency. Original image sequences to be processed are acquired through an imaging mechanism that utilizes