In view of problems existing in the detection of the traditional hydraulic system, such as the large volume of sensor and the low measurement accuracy, a new one-piece target type flow sensor is designed and researched based on fiber Bragg grating (FBG). A compact structure is designed, which is convenient to be dismantled, processed, and installed, based on the analysis of the principle of FBG and the structure of target type flow sensor. The force of target put in fluid flow is turned into the FBG wavelength drift, with a corresponding relationship. The problem on the cross sensitivities of the temperature and strain is solved effectively by using double FBG symmetrically pasted on the both surfaces of the cantilever. The impact on the fluid state is analyzed through simulation in the software FLUENT, and the results show that the impact was smaller than that of the traditional structure. The results of experiments in the hydraulic system show that there is a good linear relationship between the change in the dual FBG central wavelength and mass loading on the target sheet has a good linear relationship, and the sensitivity is twice that of a single FBG sensitivity.

针对光纤布拉格光栅(FBG)准分布式传感解调系统进行了专门的研究。结合准分布式传感解调信息混杂、动态范围大等特点，自行搭建了FBG 传感解调系统。以实验室现有的复合传感器为平台，基于LabVIEW 软件，开发出一种适用于光纤光栅准分布式传感解调的测试平台，使得承载有温度、压力、流量信息的波长变化智能区分，并通过相应计算将被测物理量实时显示。通过实验，对温度、压力、流量传感器分别进行了标定，得出相应的计算参数；通过综合实验，系统分辨出了不同物理量的波长值并直接显示被测量，实现了高精度可视化实时显示的目的，验证了系统设计的可行性与可靠性。