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Ultrasensitive Strain Sensing by Using Two Parallel Structured Fabry--Perot Interferometers in Cascaded Connection
Journal of Lightwave Technology ( IF 4.7 ) Pub Date : 2020-11-16 , DOI: 10.1109/jlt.2020.3038238
D. N. Wang , Xinlei Cui , X. L. Hua Zhang , Jun Deng

An optical fiber in-line Fabry--Perot interferometric device is presented for ultrasensitive strain sensing by use of vernier effect. The device consists of two parallel structured Fabry--Perot cavities in cascaded connection, formed by two pairs of femtosecond laser inscribed in-fiber reflection mirrors. The cavity lengths and their difference can be accurately controlled, which enables an extremely large amplification factor when vernier effect is used and the strain sensitivity achieved is ∼236.32 pm/μϵ. Moreover, the temperature cross sensitivity realized is as low as ∼29.2 nϵ/°C. The device is featured with ultra-compact size, robust structure, easy fabrication, convenient operation and good reproducibility, which makes it highly attractive in many sensing applications where extremely large strain sensitivity is critically required.

中文翻译:

级联连接中使用两个平行结构法布里-珀罗干涉仪的超灵敏应变传感

提出了一种光纤在线法布里-珀罗干涉仪,该器件可通过游标效应实现超灵敏应变传感。该设备由两个平行结构的法布里-珀罗(Fabry-Perot)空腔层叠连接而成,该空腔由两对飞秒激光刻在光纤内的反射镜形成。腔的长度和它们的差可以被精确地控制,当使用游标效应并且获得的应变灵敏度为〜236.32pm /μl时,这允许极大的放大因子。而且,所实现的温度交叉灵敏度低至〜29.2nϵ /℃。该器件具有超紧凑的尺寸,坚固的结构,易于制造,方便的操作和良好的可重复性,这使其在许多需要极高应变灵敏度的传感应用中具有很高的吸引力。
更新日期:2020-11-16
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