Investigation of Fiber Optic-Based-Refractometer for Biogas Sensing

Q2 Engineering Applied Science and Engineering Progress Pub Date : 2023-03-16 DOI:10.14416/j.asep.2023.03.003

P. Thaisongkroh, S. Pullteap

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引用次数: 1

Abstract

In this study, a fiber-based refractometer (FOR) applied for biogas sensing has been investigated. Two types of fiber, single-mode (SMF) and multimode fiber (MMF) have been proposed as sensing elements. The research aims to investigate the spot and power attenuation of both fiber types in 4 main conditions; fiber cladding, de-cladding, compound coating, and biogas feeding. The experimental results showed that the spot diameters from both fiber types are constantly at 4 and 26 mm in any conditions. This causes the difference in core diameters and also the dispersion of light characteristics within the fibers. Moreover, when the sensing element has been modified by the following conditions, the results indicated that the output intensity has proportionally changed, according to the fiber modification and the concentration of biogas absorbed into the sensing element. Besides, the power attenuation from MMF is larger than SMF. This causes the length of fiber de-cladding and dispersion of light within the MMF can easily be induced by biogas feeding. Therefore, it can be concluded that the MMF is more suitable than SMF for employment as a sensing element of the fiber refractometer.

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基于光纤的沼气传感折射仪研究

在本研究中，研究了一种用于沼气传感的光纤折射计。已经提出了两种类型的光纤，单模光纤（SMF）和多模光纤（MMF）作为传感元件。本研究旨在研究两种光纤类型在4种主要条件下的光斑和功率衰减；纤维包层、脱包层、复合涂层和沼气供给。实验结果表明，在任何条件下，两种纤维类型的光斑直径都恒定在4和26mm。这导致纤芯直径的差异以及光纤内光特性的分散。此外，当传感元件通过以下条件进行改性时，结果表明，输出强度根据纤维改性和吸收到传感元件中的沼气浓度成比例地变化。此外，MMF的功率衰减大于SMF。这导致纤维脱包层的长度和光在MMF内的分散可以很容易地通过沼气供给引起。因此，可以得出结论，MMF比SMF更适合用作光纤折射计的传感元件。

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来源期刊

Applied Science and Engineering Progress Engineering-Engineering (all)

CiteScore

4.70

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0.00%

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