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首页> 外文期刊>Microwave and optical technology letters >OPTICAL FIBER HUMIDITY SENSOR BASED ON A TAPERED FIBER WITH HYDROXYETHYLCELLULOSE/POLYVINYLIDENEFLUORIDE COMPOSITE
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OPTICAL FIBER HUMIDITY SENSOR BASED ON A TAPERED FIBER WITH HYDROXYETHYLCELLULOSE/POLYVINYLIDENEFLUORIDE COMPOSITE

机译：基于锥形纤维与羟乙基纤维素/聚偏二氟乙烯复合材料的光学纤维湿度传感器

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摘要

A simple relative humidity (RH) sensor is demonstrated using a tapered fiber with an hydrogel coating. Hydroxyethylcellulose/polyvinylidenefluoride polymers are used to form the hydrogel coating of the tapered fiber as they are sensitive to moisture and thus the humidity of the atmosphere. Changes in humidity level alter the refractive index of the fiber coating and this condition leads to variation in optical output power. A difference of up to 0.89 dB of the transmitted optical power is observed when RH changes from 50 to 80%. The proposed sensor has a sensitivity of about 0.0228 dB/%RH with a slope linearity of more than 99.91%. In summary, the hydrogel coating acts as an inner cladding whose refractive index decreases with the rise in humidity and thus allows more light to be transmitted in humid state.
机译：使用带水凝胶涂层的锥形纤维演示了一种简单的相对湿度（RH）传感器。羟乙基纤维素/聚偏二氟乙烯聚合物用于形成锥形纤维的水凝胶涂层，因为它们对水分敏感，因此对大气湿度敏感。湿度水平的变化会改变纤维涂层的折射率，这种情况会导致光输出功率的变化。当RH从50％变为80％时，观察到的传输光功率差异高达0.89 dB。提出的传感器具有约0.0228 dB /％RH的灵敏度，其斜率线性大于99.91％。总之，水凝胶涂层用作内包层，其折射率随着湿度的升高而降低，因此允许更多的光在潮湿状态下透射。

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