A temperature sensor consisting of cascaded liquid-air cavities based on Vernier effect was proposed. The cascaded liquid-air cavities were fabricated simply by partially filling a section of silica capillary tube (SCT) with dimethyl silicone oil (DSO). One opening of the SCT was spliced to the single mode fiber, and the other opening was sealed by the UV glue. The Vernier effect could be generated when the optical paths of liquid-air cavities are close to each other. More importantly, as the lengths of the two cavities change synchronously and complementarily along with the thermal shift of the liquid-air interface, the sensitivity of the sensor can be further improved by about 1.7 times on the basis of ordinary Vernier effect. The actual temperature sensitivity of the proposed sensor around 35 °C reaches as high as 39.21 nm/ °C, which makes the sensor more competitive in medical and pharmaceutical fields.

中文翻译：

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由基于游标效应的级联液-气腔组成的超灵敏光纤温度传感器

提出了一种基于游标效应的由级联液-气腔组成的温度传感器。通过用二甲基硅油 (DSO) 部分填充一段二氧化硅毛细管 (SCT) 来简单地制造级联液体-空气腔。SCT的一个开口与单模光纤熔接，另一个开口用UV胶密封。当液-气腔的光路相互靠近时，就会产生游标效应。更重要的是，由于两个腔体的长度随着液-气界面的热位移同步互补变化，传感器的灵敏度在普通游标效应的基础上可进一步提高约1.7倍。所提出的传感器在 35°C 左右的实际温度灵敏度高达 39.21 nm/°C，