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Impacts of the distribution of hydrogel spheres attached on bare fiber core on light transmission of the fiber

机译：附着在裸纤芯上的水凝胶球的分布对光纤的透光率的影响

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Impacts of the distribution of hydrogel spheres attached on bare fiber core on fiber transmission are studied by ray-tracing simulation. The aim of the study was to optimize the previously reported configuration and sensitivity of humidity sensors based on bare fiber core attached with humidity-sensitive hydrogel spheres. Four uneven distribution types, namely, asymmetric-geometric, asymmetric-arithmetic, symmetric-geometric and symmetric-arithmetic for sensors in length of 10 cm and attached with six hydrogel spheres are simulated and compared with the uniform distribution. Spheres in diameter of 0.6, 0.8 and 1 mm are simulated to reveal impacts of the sphere size. It is found that the sphere size is a significant factor that determines impacts of the sphere distribution on the sensitivity, which is defined as the slope of fiber transmissions over refractive index of spheres. For sensors attached with 0.6 mm hydrogel spheres, uneven distributions result in sensitivities close to that of the uniform distribution. However, uneven distributions with 0.8 or 1 mm spheres yields much higher sensitivities. The highest sensitivities for sensors with 0.8 and 1 mm are 19% and 39% higher than that of uniform distributions respectively, suggesting that properly distributing hydrogel spheres is a convenient way to enhance sensitivities. Moreover, results show that sensors with 0.8 mm hydrogel spheres have higher sensitivities than that of 1 mm for the same sphere distribution, and the underlining re-collecting effect is revealed to explain this phenomenon. In addition, simulations reveal that optical loss of spheres have a positive but marginal effect on the sensitivity.
机译：通过射线追踪模拟研究了裸露在纤维芯上的水凝胶球的分布对纤维传输的影响。该研究的目的是基于连接有对湿度敏感的水凝胶球体的裸纤芯，优化先前报道的湿度传感器的配置和灵敏度。模拟了长度为10 cm并附有六个水凝胶球体的传感器的四种不均匀分布类型，即非对称几何，不对称算术，对称几何和对称算术，并将其与均匀分布进行了比较。模拟直径为0.6、0.8和1毫米的球体以揭示球体尺寸的影响。已经发现，球的尺寸是决定球的分布对灵敏度的影响的重要因素，灵敏度的定义是光纤传输在球的折射率上的斜率。对于装有0.6毫米水凝胶球的传感器，分布不均会导致灵敏度接近均匀分布。但是，具有0.8或1 mm球体的不均匀分布会产生更高的灵敏度。直径为0.8和1 mm的传感器的最高灵敏度分别比均匀分布的传感器高19％和39％，这表明适当分布水凝胶球是提高灵敏度的便捷方法。此外，结果表明，对于相同的球体分布，具有0.8 mm水凝胶球体的传感器比1 mm传感器具有更高的灵敏度，并且揭示了下划线的重新收集效应可以解释这种现象。此外，仿真显示，球体的光学损耗对灵敏度有积极但微不足道的影响。

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