Abstract: The structures and properties of a symmetrical optical fiber bundle differential pressure sensor were studied herein. First, a kind of structures of symmetrical optical fiber bundle differential pressure sensor was put forward, which consisted of two identical structure detection probes and bridge optical paths, the detection probes adopted mechanical capsulation. Second, by theoretical studies on the sensor, a intensity modulation mathematical model was established, simulation calculations and analyses were carried out. Finally, an experimental prototype was pilot produced, and experimental researches were carried out.The experimental results of show that: under different design sizes of probes and the diaphragm, sensor has different measurement ranges, output sensitivities, detection resolutions, linearity and repeatability precisions.The results show that this symmetrical optical fiber bundle differential pressure sensor has a good detection performances,which may be able to meet needs of different detections.

Key words: fiber optics, differential pressure sensor, geometric optics, performances detection

摘要： 对一种对称式光纤束差压传感器的结构及性能进行了研究。提出了一种两相同结构检测探头与桥式光路组成的对称式光纤束差压传感器，传感器探头采用机械式封装；对传感器进行理论研究，建立了强度调制数学模型，并对其进行仿真计算与分析；最后试制出实验样机，进行实验研究，实验结果表明：探头与膜片在不同设计尺寸下，传感器具有不同的量程、输出灵敏度、检测分辨率、线性度与重复性精度。研究结果表明，光纤束差压传感器具有较好的检测性能，能满足不同检测场合的需要。

关键词: 光纤光学, 差压传感器, 几何光学, 性能检测