细芯光纤M-Z干涉传感器多参数测量研究

发布时间：2018-06-23 09:48

  本文选题：光纤传感 + 细芯光纤(TCF)　； 参考：《光电子·激光》2016年06期

【摘要】：实验制备了基于细芯光纤(TCF)的马赫-曾德尔干涉仪(MZI)并进行了多参数测量传感研究。传感器采用两段单模光纤(SMF)进行腰椎放大连接细芯光纤,形成MZI结构。利用TCF与SMF的纤芯直径不匹配,在第1个接点激发出包层模式,包层模在第2个接点耦合进纤芯与纤芯模产生干涉,利用干涉条纹的波长漂移实现对外界环境参量的测量。实验所用的TCF纤芯的掺Ge浓度较高(约为38mol.%),相对折射率和热光系数较普通SMF大,所以在保证适当的自由光谱范围(FSR)的前提下,TCF的长可以减小到2 mm,传感头尺寸较小,且传感结构对于温度的变化十分敏感。实验结果表明,在30~250℃的温度范围内,其温度灵敏度为70.2pm/℃,并具有较好的线性响应度。测试了传感器对折射率、应变和弯曲的响应,获得的灵敏度分别为-8.12nm/RIU、1.8pm/με和2.07nm/m-1。
[Abstract]:Mach-Zehnder Interferometer (MZI) based on thin core fiber (TCF) was fabricated and multi-parameter sensing was studied. The sensor uses two-segment single mode fiber (SMF) to amplify and connect fine core optical fiber to form MZI structure. The cladding mode is excited at the first contact point by using the mismatch of the diameter of the fiber core between TCF and SMF. The cladding mode is coupled with the core mode at the second contact point to produce interference. The external environmental parameters are measured by the wavelength drift of the interference fringes. The TCF core has a higher concentration of GE (about 38mol 路%), and the relative refractive index and thermo-optical coefficient are larger than those of ordinary SMF, so the length of TCF can be reduced to 2 mm under the condition of proper free spectral range (FSR), and the size of sensor head is smaller. The sensing structure is sensitive to the temperature change. The experimental results show that the temperature sensitivity is 70.2pm/ 鈩，

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