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本来写半月谈的初衷是及时报道光纤传感方面的进展,注重的是时效性。而今写成了这个样子,感觉真是对不起读者。抓紧补吧。这一期谈谈2012年第一季度的文献。
1、折射率传感器
中国科大的L. Yang等人报道了一种基于导模-泄露模-导模的光纤结构及其用于折射率传感的方法(L. Yang, et al., "Guided-mode-leaky-mode-guided-mode fiber structureand its application to high refractive index sensing," Opt. Lett., vol. 37, pp. 587-589, 2012.),图1。
图1 L. Yang等人报道的光纤结构
新西兰的B. Wang等人报道了在光纤端面上安装光子晶体的折射率传感器(B. Wang, et al., "Photonic crystal cavity on optical fiber facet forrefractive index sensing," Opt.Lett., vol. 37, pp. 833-835, 2012.),图2。
图2 在光纤端面上的光子晶体
成都电子科技大学的X. J. Zhou等人报道了采用机械应力形成的LPG用于折射率传感(X. J. Zhou, et al.,"Refractive Index Sensing by Using Mechanically Induced Long-PeriodGrating," Ieee Photonics Journal,vol. 4, pp. 119-125, Feb 2012.),图3。
图3 机械应力形成的LPG用于折射率传感
南京大学的S.-j. Qiu等人报道了采用PCF的温度和折射率同时测量的方法(S.-j. Qiu, et al.,"Temperature sensor based on an isopropanol-sealed photonic crystal fiberin-line interferometer with enhanced refractive index sensitivity," Opt. Lett., vol. 37, pp. 863-865, 2012.),其温度灵敏度可达-166 pm/℃,该传感器通过将PCF熔接在SMF中间而形成干涉仪,如图4。
图4 PCF和SMF的熔接
华中科技大学的J. Wo等人报道了基于微光纤MZ干涉仪的折射率传感器(J. Wo, et al.,"Refractive index sensor using microfiber-based Mach-Zehnderinterferometer," Opt. Lett.,vol. 37, pp. 67-69, 2012.),如图5。
图5 基于微光纤MZ干涉仪的RI传感器
美国Stevens理工学院的F. Tian等人报道了采用有限差分频域分析的方法对PCF上的LPG折射率传感器进行分析(F. Tian, et al.,"Numerical and experimental investigation of long-period gratings inphotonic crystal fiber for refractive index sensing of gas media," Opt. Lett., vol. 37, pp. 380-382, 2012.)。结果表明,波长越长,对外界折射率越敏感。
2、FP传感器
重庆大学的D. W. Duan等人报道了通过熔接单模光纤时形成微腔的FP应变传感器(D. W. Duan, et al.,"Microbubble based fiber-optic Fabry-Perot interferometer formed by fusionsplicing single-mode fibers for strain measurement," Applied Optics, vol. 51, pp. 1033-1036, Mar 2012.),图6。
图6 SM光纤熔接微腔FP传感器
与上面的结构类似,巴西的F. C. Favero等人报道了采用PCF和单模光纤熔接的微腔FP传感器(F. C. Favero, etal., "Spheroidal Fabry-Perot microcavities in optical fibers forhigh-sensitivity sensing," OpticsExpress, vol. 20, pp. 7112-7118, 2012.),试验结果同样表面了较高的应变灵敏度和低温度系数,图7。
图7 PCF与SM光纤熔接FP传感器
安徽大学的F. Xu等人报道了采用纳米级厚度的银膜的EFPI压力传感器(F. Xu, et al.,"High-sensitivity Fabry-Perot interferometric pressure sensor based on ananothick silver diaphragm," OpticsLetters, vol. 37, pp. 133-135, 2012.),灵敏度高达70.5 nm/kPa,图8。
图8 采用纳米级银膜的EFPI压力传感器
台湾的C. L. Lee等人报道了采用空心光纤填充聚合物形成的FP传感器(C. L. Lee, et al.,"Highly Sensitive Air-Gap Fiber Fabry-Perot Interferometers Based onPolymer-Filled Hollow Core Fibers," IEEEPhotonics Technology Letters, vol. 24, pp. 149-151, Jan 2012.),如图9。由于聚合物具有较高的热膨胀系数,该传感器对温度十分敏感。作者称该传感器的优点是成本低、易加工、腔长可控、温度灵敏度高。
图9 采用聚合物填充的FP传感器
葡萄牙的S. H. Aref报道了采用suspended-core光纤的FP干涉仪和Sagnac干涉仪的温度和压力传感特性(S. H. Aref, et al.,"Pressure and temperature characterization of two interferometricconfigurations based on suspended-core fibers," Optics Communications, vol. 285, pp. 269-273, Feb 2012.),图10。
图10 采用suspended-core光纤的两种干涉仪
美国马萨诸塞大学的X. T. Zou等人报道了采用光纤FP温度传感器监测混凝土水化过程的结果(X. T. Zou, et al., "An experimental study on the concrete hydrationprocess using Fabry-Perot fiber optic temperature sensors," Measurement, vol. 45, pp. 1077-1082, Jun2012.),图11。
图11 X. T. Zou等人使用的FP传感器结构
电子科技大学的E. Lu等人报道了FP传感器的解调方法(E. Lu, et al.,"Demodulation of micro fiber-optic Fabry-Perot interferometer usingsubcarrier and dual-wavelength method," Optics Communications, vol. 285, pp. 1087-1090, Mar 2012.)。
东北大学的Y. Zhao等人报道了采用空心PCF的FP传感器用作磁场传感(Y. Zhao, et al.,"Hollow-core photonic crystal fiber Fabry-Perot sensor for magnetic fieldmeasurement based on magnetic fluid," Opticsand Laser Technology, vol. 44, pp. 899-902, Jun 2012.),图12为其传感头结构图。
图12 基于空心PCF的FP磁场传感器
3、基于光纤激光器的传感器
南开大学的H. Zhang等人报道了采用多纵模DBR光纤激光器的排频来测量光纤双折射的方法(H. Zhang, et al., "Fiber birefringence measurement based on abeat-frequency-interrogated multilongitudinal-mode distributed bragg reflectorerbium-doped fiber laser," MICROWAVEAND OPTICAL TECHNOLOGY LETTERS, vol. 54, pp. 702-707, 2012.)。
华中科技大学的J. Wo等人报道了采用DBR光纤激光器的两个偏振模排频来进行扭转传感的方法(J. Wo, et al., "Twist sensor based on axial strain insensitivedistributed Bragg reflector fiber laser," Opt. Express, vol. 20, pp. 2844-2850, 2012.),图13。实验证实排频变化与扭角为正弦函数关系,函数的周期和灵敏度取决于被扭光纤的长度。
图13 用光纤激光器的两个偏振模排频进行扭转传感
暨南大学的L. Jin等报道了采用光纤激光器的两个偏振模排频进行温度传感的方法(L. Jin, et al., "Strain-insensitive temperature sensing with a dualpolarization fiber grating laser," Opt.Express, vol. 20, pp. 6021-6028, 2012.),单纵模光纤激光器的两个偏振模排频与温度相关,但对轴向应力不敏感,因此可作为应力不敏感光纤温度传感器。图14为温度测试结果。
图14 利用激光器偏振模排频的温度测试结果
马来西亚的H. K. Hisham等人报道了光纤FP激光器的相位噪声特性(H. K. Hisham, etal., "Characterization of phase noise in a single-mode fiber grating Fabry–Perot laser," Journal of Modern Optics, vol. 59, pp.393–401, 2012.)。在其后的文章中,作者有对其调制特性进行了研究(H. K. Hisham, et al., "Improving the characteristics of themodulation response for fiber Bragg grating Fabry-Perot lasers by optimizingmodel parameters," Optics and LaserTechnology, vol. 44, pp. 1698-1705, Sep 2012.)。
美国海军实验室的G. A. Miller等人综述了基于光纤激光器的高性能传感技术(G. A. Miller, et al., "High performance sensing using fiberlasers," Optics & Photonics News,pp. 31-36, 2012.)。
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