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引用次数: 1
摘要
我们提出了一种光纤传感器，提高了对圆双折射变化的灵敏度。该传感器基于Malus和Fabry-Perot干涉仪的组合，可以灵敏地检测由于施加在光纤上的扭转而导致的引导光束偏振的变化。这种被称为Mauls Fabry-Perot (MFP)干涉仪(Vallet et al.， 1999)的光学布置背后的基本思想是，由于光束多次通过传感区域，因此可以提高测量腔内各向异性的灵敏度。基于琼斯演算的光纤MFP干涉仪(FOMFPI)的理论分析表明，通过这种排列记录传输变化，可以测量光纤圆双折射的变化。实验结果表明，与单次偏振光计测量相比，采用块光学元件和光纤的混合MFP排列可以有效地提高灵敏度。
Enhancement in sensitivity for fiber optic torsion sensors
We present a fiber optic sensor with enhanced sensitivity to changes in circular birefringence. The sensor is based on the combination of a Malus and a Fabry-Perot interferometer, and allows for the sensitive detection of changes in the polarization of the guided beam due to torsion applied to the fiber. The basic idea behind this optical arrangement, known as the Mauls Fabry-Perot (MFP) interferometer (Vallet et al., 1999), is to enhance the sensitivity for the measurement of intra-cavity anisotropies due to multiple passes of the beam through the sensing area. Theoretical analysis based on Jones calculus for a fiber optic MFP interferometer (FOMFPI) shows that it is possible to measure variations in circular birefringence of the fiber upon registering changes in the transmission through this arrangement. Experimental results with a hybrid MFP arrangement of bulk optical components and optical fibers show that, compared to single-pass polarimeters measurements, an enhancement in sensitivity is effectively achieved.
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