海洋溢油的油种鉴别是海洋环境监测的难点，如何区分不同油种是迫切需要解决的问题。研制了一种用于鉴别海洋溢油油种的新型微纳光纤环形腔(MRR)传感器，分别从理论和实验研究了海水和汽油的谐振光谱特性。根据Maxwell方程，数值计算了微纳光纤环形腔鉴别海水和汽油的灵敏度和自由谱域。研制了Knot型微纳光纤环形腔传感器，其微纳光纤直径为4.14 μm，谐振腔直径为480.31 μm，搭建了测量海水和汽油的实验系统，分别获得了海水与93号汽油的谐振光谱，谐振峰波长移动了2.79 nm，该结果与理论计算基本相同，灵敏度达到了34.86 nm/RIU，RIU为单位折射率。因此，该方法能够区分海水与汽油。

Oil identification of marine oil spill is a problem for monitoring the marine environment, which needs to be solved urgently. It is very important to distinguish different types of oil. A sensor of microfiber ring resonator (MRR) for identifying the oil species of marine oil spills is developed, and the resonant spectral characteristics of the seawater and gasoline are investigated experimentally and theoretically. The sensitivity and free spectral range of MRR for identifying the seawater and gasoline are calculated numerically according to Maxwell′s equations. A Knot-type MRR sensor is manufactured, whose ring diameter is 480.31 μm, and microfiber diameter is 4.14 μm. The experimental system is established, and the resonant spectra of seawater and 93# gasoline are obtained. Results show that the resonant wavelength shifts 2.79 nm, which is mainly consistent with theoretical calculations. The sensitivity reaches to 34.86 nm/RIU, where RIU is refractive index unit. Therefore, the MRR sensor can be used for distinguishing seawater and gasoline.