基于光纤光栅的高灵敏度流速传感器  

High-Sensitivity Flow Velocity Sensor Based on Fiber Grating

作　　者：陈建军[1] 张伟刚[1] 涂勤昌[1] 邹玉姣[2] 赵天工[1] 杜晓娜[1] 董孝义[1] 

机构地区：[1]南开大学信息技术科学学院现代光学研究所光电信息技术科学教育部重点实验室,天津300071 [2]南开大学物理科学学院,天津300071

出　　处：《光学学报》2006年第8期1136-1139,共4页Acta Optica Sinica

基　　金：国家自然科学基金(60577018);国家863计划(2002AA313110);南开大学科技创新基金;光电信息技术科学教育部重点实验室开放课题(2005-06);南开大学本科生创新科研项目资助课题

摘　　要：利用光纤光栅压强传感机构和汾丘里管设计了一种基于光纤光栅的流速传感器，并推导了光纤光栅中心波长漂移量与流速的关系式。实验表明，该传感器具有较高的灵敏度，稳定性较好，光纤光栅的中心波长随流速的增加而不断向短波方向漂移，而带宽几乎没有变化，实验和理论符合得较好。该流速传感器的动态感测范围为51．0～148．2mm／s，在该范围内，至少可感测到0．3mm／s的流速变化，这是目前所报道的最优值。优化光纤光栅压强传感机构及汾丘里管的参量，可测量其它速度段的流速，并可进一步提高传感灵敏度。A novel flow velocity sensor based on fiber grating by using the fiber grating pressure sensing setup and Venturi tube is designed. The expression of relationship between the flow velocity and the shift of central wavelength of fiber grating is derived and the experimental results are in good agreement with theoretical analysis. The central wavelength of fiber grating shifts to the shorter wavelength with rise of the flow velocity, while the bandwidth is almost unchanged. The sensor is very sensible to the flow velocity, and very stable. The measuring range is 51.0- 148.2 mm/s and in that range the sensor can distinguish the change of the flow velocity as low as 0.3 mm/s which is the lowest to our knowledge. By optimizing the parameters of the sensor, the sensitivity can be improved and it can measure the velocity of different ranges.

关 键 词：光纤光学 光纤光栅 流速 传感器 开H环 

分 类 号：TB937[一般工业技术—计量学] TH814[机械工程—测试计量技术及仪器]