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提出了一种全单模光纤的本征型法布里-珀罗干涉(IFPI)高温传感器。光纤IFPI传感器由飞秒激光在标准单模光纤上刻写的一对内部反射镜和腔内光纤构成,其反射光谱的干涉条纹对比度达到10dB,而插入损耗仅为0.1dB。实验结果表明,该传感器的测量温度可达1000℃,温度灵敏度为14.9pm/℃。而且在重复测量中,反射光谱具有良好的一致性,可以准确地实现高温传感。飞秒激光制备的光纤IFPI高温传感器完全由标准单模光纤构成,结构简单、成本低廉,易于连接现有的光纤器件构成光纤传感网络,在实际工程中有较大的应用价值。
A full-mode fiber intrinsic type Fabry-Perot interference (IFPI) high temperature sensor is proposed. The fiber IFPI sensor consists of a pair of internal mirrors and cavity fibers inscribed on a standard single-mode fiber by femtosecond laser with contrast spectrum of interference fringes of 10 dB and insertion loss of only 0.1 dB. Experimental results show that the sensor can measure temperature up to 1000 ℃ and temperature sensitivity is 14.9pm / ℃. And in repeated measurements, the reflectance spectrum has a good consistency and can accurately achieve high-temperature sensing. The optical fiber IFPI high temperature sensor made of femtosecond laser is composed entirely of standard single-mode optical fiber, has the advantages of simple structure, low cost and easy connection to existing optical fiber components to form optical fiber sensing network, which has great application value in practical engineering.