RIM型光纤传感器错位式补偿结构的改进

Analysis of displacement compensation structure of RIM optical fiber sensor

针对RIM(reflective intensity modulated)型光纤传感器中光源功率波动等因素造成的对测量精度的影响,分析比较不同等芯错位式结构的优缺点,并结合双圈同轴式探头结构优点,提出了1种内凹阶梯型等芯错位式补偿结构。基于光纤纤端光场分布理论,建立调制特性数学模型,并进行仿真与分析,根据分析结果制备出改进结构的传感器探头,并进行实验验证。得出结果表明,所提出结构的实际测量数据与数值计算预期结果基本一致,可改善等芯错位式结构在线性度及线性范围方面的不足。

Aiming at the factors such as the fluctuation of the power source influenced the measurement accuracy of RIM opticil ti-ber sensor, the advantages and disadvantages of the different equal core dislocation structures are ning the advantages of the doubl＇^loop coaxial probe structure, we propose a concave ladder compensation structure. distribution theory of light field, the mathematical model of the modulation characteristic is established and simulated. The actualmeasurement data from experiment based on the sensor probe demonstrates the improved structure consistenresults, and the improved linearity and linear range of the disproportionate structure.