提出一种干涉式全光纤传感器,能够同时实现对折射率和轴向拉力或温度进行双参数测量。传感器由一个微腔和一个纤芯失配衰减器组成。其中微腔结构是由飞秒激光加工光纤纤芯形成,直径和深度分别是6μm和2.5μm。该干涉式传感器可以获得20dB的高品质干涉对比度。传感器透射谱波长为1496.68nm和1533.18nm的两个衰减峰对应的折射率灵敏度分别为-29.91nm/RIU和-16.72nm/RIU,拉力灵敏度分别为-1.55pm/με和-0.31pm/με。实验结果表明,传感器通过灵敏度矩阵可以同时测量折射率和轴向拉力或温度两个参数。 An all-fiber interferometer sensor is proposed to measure the refractive index, axial tension or temperature simultaneously. The sensor consists of a microcavity and a fiber core mismatch attenuator. The microcavity structure is formed by femtosecond laser fiber core, the diameter and depth are 6μm and 2.5μm respectively. The interferometric sensor achieves high quality interference contrast of 20dB. The refractive index sensitivities corresponding to two attenuation peaks at 1496.68 nm and 1533.18 nm are -29.91 nm / RIU and -16.72 nm / RIU, respectively, and the tensile sensitivities are -1.55 pm / με and -0.31 pm / με, respectively. The experimental results show that the sensor can simultaneously measure the refractive index and the axial tension or temperature through the sensitivity matrix.