针对传统流量测量中存在的测量灵敏度不高、测量参数单一，传感器体积较大等不足，提出一种基于光纤布拉格光栅（FBG）的多功能复合流量传感器。传感器以FBG差压式流量测量为结构主体，同时有机集成了FBG温度和压力传感器，从而实现对被测流体的流量、压力和温度的同时测量。在介绍FBG传感原理的基础上，分析了毛细钢管封装FBG温度传感器和盲管式FBG压力传感器的工作机理。同时，在分析差压式FBG流量传感器工作原理的基础上，介绍了FBG多功能复合流量传感器的结构和实现原理。分别采用水浴装置、压力表校验仪和综合流量测试台对多功能复合传感器中的FBG温度、压力和流量传感器进行了传感特性实验。测试结果表明，FBG温度传感器的灵敏度为0.015 nm/℃，FBG压力传感器的灵敏度为0.028 nm/MPa，FBG流量传感器的分辨率为0.068 L/s。同时，传感器的温度测量功能可作为参考，从而克服FBG压力及流量测量中的温度交叉敏感效应。

In view of the problems such as the low measurement accuracy, single measuring parameter, large sensor volume are exist in the traditional flow measurement, and a multifunction integrated flow sensor based on fiber Bragg grating (FBG) is designed. The multifunction flow measurement using FBG differential pressure type flow measurement as structure body, and integrating FBG temperature and pressure sensor, thus the fluid flow, pressure and temperature are measured at the same time. On the base of introducting the FBG sensing principle, the capillary tube packaging FBG sensor and the blind-piple FBG pressure sensor working principle are analyzed. Meanwhile, on the basis of analysis the sensing principle of differential pressure type FBG flow sensor, the structure and realize principles of the multifunction FBG flow sensor are introducted. Using water bath, pressure gauge calibration meter and integrated flow test plantform, which test the sensing charactors of the FBG temperature, pressure and flow sensor within the multifunction FBG sensor. According to the test results, the sensitivity of FBG temperature sensor is 0.015 nm/℃, the sensitivity of FBG pressure sensor is 0.028 nm/MPa, and the sensitivity of FBG flow sensor is 0.068 L/s. At the same time, the temperature sensor is used as a reference, which can solve the temperature inter-sensitive effect in the FBG pressure and flow measurement.