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利用CO2激光脉冲对标准单模光纤(SMF)单向形成较小的几何形变,把部分基模能量耦合到光纤包层,制作了一种新型的在线型Michelson干涉传感器。理论分析了这种几何微扰激发的包层模特性,并利用芯模-包层模较大的热光系数差,把这种传感器应用于高温测量。实验结果表明,这种干涉传感器的温度灵敏度为0.093 7nm/℃,并且在800℃温度范围内具有良好的线性和重复性。这种制作简单、结构稳定、体积小和灵敏度高的全光纤在线型Michelson温度传感器将具有较大的潜在应用价值。
A new type of on-line Michelson interferometer sensor was fabricated by CO2 laser pulse forming a small geometric deformation unidirectionally with a standard single-mode fiber (SMF) and coupling some fundamental energy to the fiber cladding. The geometrical perturbation excited cladding model property is analyzed theoretically, and the difference of the thermo-optic coefficient of the core-cladding mode is used to apply the sensor to the high temperature measurement. The experimental results show that the temperature sensitivity of this interferometric sensor is 0.093 7nm / ℃, and has good linearity and repeatability in the temperature range of 800 ℃. This easy to manufacture, stable structure, small size and high sensitivity all-fiber Michelson on-line temperature sensor will have greater potential applications.