针对海水泵滑靴副水膜厚度测量需求，利用反射强度调制型位移光纤传感器工作原理设计并实现了一种水膜厚度检测系统。设计了与海水泵结构相对应的光纤探头，其采用具有较好补偿功能的三圈同轴型光纤束结构消除了由光源强度、反射表面性质以及光纤光强损耗和弯曲损耗等因素带来的影响; 开发了由光源模块、电源模块、光电转换模块、低通滤波模块、信号比值模块等组成的前置器用于信号调理。对开发的水膜厚度光纤检测系统进行了静态性能和动态性能测试实验，结果表明: 该检测系统的测量精度可达微米级，测量系统的量程为1 000 μm，灵敏度为3.45 mV /μm，动态性能良好，满足了对海水泵水膜厚度的检测需求。

For the purpose to measure the water-film thickness of a sea water pump slipper pair, a measurement system based on a reflective modulated optical fiber displacement sensor was designed and implemented. A new optical fiber probe structure which matches the construction of sea water pump was designed, in which a three-circle coaxial fiber bundle with better compensation function was used to eliminate the influences caused by the intensity fluctuation of light source, the character of reflective surface, optical loss and the bending loss. The signal conditioning circuit consisting of a light source，a power supply，a photoelectric conversion circuit, a low pass filter and a dividing circuit was developed to adjust the signals. The experimental test for static property and dynamic property of the system was performed and the results demonstrate that the system offers a precision of micron-level and a good dynamic property. Its measuring range is 1 000 μm ,and sensitivity is 3.45 mV/μm. This results verify that the measurement system proposed in this paper meets the requirements of the measurement of water film thickness.