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提出了一种简单的高灵敏度的光纤高温探针传感器,该传感器由一小段多模光纤和一端镀有银膜的单模光纤熔接而成.由于单模光纤和多模光纤的纤芯直径不同,当光波从多模光纤传输至多模光纤和单模光纤的熔接端面时,一部分纤芯光耦合进包层,因为单模光纤纤芯的折射率和包层的折射率不同,不同模式的光经过银膜反射后在多模光纤内重新耦合进单模光纤,最终形成干涉.随着外界温度的升高,干涉谱峰值会向长波方向漂移.实验结果证明这种传感器在470℃—600℃范围内具有很好的稳定性,线性度达99.7%,灵敏度为120pm/℃,可作为远距离反射型探针温度传感器,在石油探测和油气田开发等领域有着广泛的应用前景.
A simple high-sensitivity fiber optic high-temperature probe sensor is proposed, which consists of a short multi-mode fiber and a single-mode fiber coated with silver film on one end. Due to the different core diameter of single-mode fiber and multimode fiber When the light wave is transmitted from the multimode fiber to the fusion end face of the multimode fiber and the single mode fiber, part of the core is optically coupled into the cladding. Because the refractive index of the single mode fiber core and the refractive index of the cladding are different, different modes of light After the reflection of the silver film, the multi-mode fiber is re-coupled into the single-mode fiber to finally form the interference.With the increase of the external temperature, the peak of the interference spectrum will drift to the long-wave direction.The experimental results show that the sensor operates at 470 ℃ -600 ℃ It has a good linearity of 99.7% and a sensitivity of 120pm / ℃. It can be used as a remote reflective probe temperature sensor and has wide application prospects in the fields of petroleum exploration and oil and gas field development.