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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Liquid-level sensing based on periodic evanescent field absorption from a multimode optical fibre
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Liquid-level sensing based on periodic evanescent field absorption from a multimode optical fibre

机译：基于多模光纤的周期性渐逝场吸收的液晶感测

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摘要

The working of a robust, long dynamic range, quasi-continuous fibre-optic liquid-level sensor is demonstrated in this communication. The sensor principle is based on periodic evanescent light wave absorption when rising level of liquid gradually replaces the surrounding air medium from a periodically uncladded step-index multimode optical fibre which would cause local variation in normalized frequency parameter (V) of the fibre. With our proposed sensor design, liquid-level variation as small as 2.5 cm can be measured with high accuracy and repeatability, which can be further enhanced by reducing the spacing between two adjacent regions of the fibre. Owing to its simplicity and robustness in operation, we envision that the proposed sensing technique could emerge as an alternative to the existing optical-based liquid-level sensors.
机译：在这种通信中对了稳健，长动力范围，准连续光纤液晶级传感器进行了工作。 传感器原理基于周期性蒸发光波吸收，当液体的上升水平逐渐取代周围的空气介质从周期性的未加注的步骤指数多模光纤，这将导致光纤的归一化频率参数（V）的局部变化。 利用我们所提出的传感器设计，可以通过高精度和可重复性测量小于2.5cm的液位变化，可以通过减小纤维的两个相邻区域之间的间隔进一步增强。 由于其在操作中的简单性和稳健性中，我们设想所提出的传感技术可以作为现有光学液位传感器的替代品出现。

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