Department of Electronic and Computer Engineering, University of Limerick, Plassey Rd., Limerick, Ireland.
Sensors (Basel). 2013 Oct 25;13(11):14466-83. doi: 10.3390/s131114466.
This paper presents the implementation of power fluctuation compensation for an intensity-based optical fibre bending sensor aimed at monitoring human spine bending in a clinical environment. To compensate for the light intensity changes from the sensor light source, a reference signal was provided via the light reflection from an aluminum foil surface fixed at a certain distance from the source fibre end tips. From the results, it was found that the investigated sensor compensation technique was capable of achieving a 2° resolution for a bending angle working range between 0° and 20°. The study also suggested that the output voltage ratio has a 0.55% diversion due to input voltage variation between 2.9 V and 3.4 V and a 0.25% output drift for a 2 h measurement. With the achieved sensor properties, human spine monitoring in a clinical environment can potentially be implemented using this approach with power fluctuation compensation.
本文提出了一种基于强度的光纤弯曲传感器的功率波动补偿实现方法，旨在监测临床环境中的人体脊柱弯曲。为了补偿来自传感器光源的光强变化，通过固定在光源光纤末端一定距离处的铝箔表面的光反射提供参考信号。结果表明，所研究的传感器补偿技术能够在 0°至 20°的弯曲角度工作范围内实现 2°的分辨率。研究还表明，由于输入电压在 2.9 V 和 3.4 V 之间变化，输出电压比会出现 0.55%的偏差，而在 2 小时的测量中，输出漂移为 0.25%。通过实现传感器的这些特性，使用这种带有功率波动补偿的方法，有可能在临床环境中监测人体脊柱。
