分析了157 nm激光制作的光纤法珀折射率传感器的传感特性.采用干涉条纹计数的方法对法珀腔的反射光谱进行解调，避免了光强波动的影响，同时具有较宽的折射率(RI)范围.在0~70℃范围内25 μm的法珀腔腔长变化量为6.25 nm，等效折射率变化为~2.46×10－4.常温下对折射率范围为1.33~1.427的甘油(丙三醇)溶液进行了测量，实验结果曲线的相关系数为0.9951，测量准确度为~3.70×10－4.

The sensing characteristics of optical fiber F-P refractive index sensor produced by 157 nm excimer laser micromachining system in normal single-mode optical fiber was analysed.The reflective spectrum interferometic fringe count of this F-P sensor,which can avoid the fluctuation of optical power of the measurement system was employed,and it could lead to a large refractive index measurement range.The length variation of a F-P cavity with about 25 μm length is 6.25nm when the temperature varies from 0 ℃ to 70 ℃ ,which equates the refractive index variation of the cavity ~2.46×10－4 .The glycerin solution with the refractive index range of 1.33~1.427 was measured in normal temperature.The correlation coefficient of fitting curve of experiment results is 0.9951 and the resolution is ~2.46×10－4.