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基于偏芯熔接技术构建了一种新型马赫-曾德尔干涉(MZI)原理的应力与折射率光纤传感器。该传感器是由一段单模光纤的两端实施偏芯熔接而成。利用光纤包层模、纤芯模对应力和折射率的敏感特性,实现对外界折射率和应力的测量。研究结果表明,施加轴向应力范围为0~500με时,传感器的近红外透射光谱的波长出现蓝移,在1585nm附近干涉谷处的应力灵敏度约为-7.00pm/με;外界折射率在1.331~1.398RIU(RIU为单位折射率)范围时,传感器的近红外透射光谱的波长出现蓝移,在1570nm附近干涉谷处的折射率灵敏度约为-55.223nm/RIU;且均具有良好的线性拟合效果。该传感器也可应用于温度等其他参数测量,具有非常广阔的应用前景。
A novel Mach-Zehnder interference (MZI) principle stress and refractive index optical fiber sensor was constructed based on the eccentric core fusion technology. The sensor is composed of a section of single-mode fiber ends of the implementation of eccentric welding. The use of fiber cladding mode, core-mode stress and refractive index of the sensitive properties, to achieve the external refractive index and stress measurements. The results show that when the axial stress range from 0 to 500με, the near-infrared transmission spectrum of the sensor shows a blue shift in wavelength, and the stress sensitivity near the interference valley at about 1585nm is about -7.00pm / με. The external refractive index ranges from 1.331 ~ At 1.398 RIU (refractive index RIU), the near-infrared transmission spectrum of the sensor shows a blue shift in wavelength with a refractive index sensitivity of approximately -55.223 nm / RIU at the vicinity of 1570 nm and a good linear fit effect. The sensor can also be applied to other parameters such as temperature measurement, has a very broad application prospects.