针对航空领域对大气压力的测量需求, 基于光纤法珀传感和低相干干涉技术, 搭建了光纤法珀多通道压力传感系统。介绍了系统解调算法及工作原理, 对光纤法珀压力传感器的标定和温度补偿方法进行理论分析, 将非恒温条件下的传感器拟合误差降低至0.134% F.S.。在风洞环境中, 在侧滑角-4°~4°变化范围内, 对飞机实体模型的三个监测点进行压力测量实验, 并将压力测量结果与Ansys-Fluent软件模拟仿真结果做对比。结果显示, 光纤法珀压力传感系统与模拟仿真数据变化趋势相同, 全量程误差为0.38% F.S., 证明此系统能够提供可靠的压力数据, 真实反映飞机模型被监测位置在风洞中的受力情况。

In order to meet the requirement of atmospheric pressure measurement in the aviation field, based on the principle of the optical fiber Fabry-Perot (F-P) sensing and low coherence interference, an optical fiber F-P multi-channel pressure sensing system was proposed. First of all, the demodulation algorithm and basic principle were introduced, the calibration method and temperature compensation of the optical fiber F-P pressure sensor were analyzed in theory. The fitting error of the sensor under non-constant temperature condition was reduced to 0.134% F.S.. Then, in the wind tunnel environment within -4°-4° sideslip angle range, the pressure measurement experiment was carried out on three monitoring points of the aircraft model. The results were compared with the simulation results using Ansys-Fluent software. In conclusion, the results show that the system using the optical fiber F-P pressure sensor and the Ansys-Fluent numerical simulation have the same trend of demodulation results, with the full range error of 0.38% F.S.. The experiments confirm that the system can provide reliable pressure data accurately and reflect the pressure of the aircraft model′s monitoring points in the wind tunnel.