Fundamental study on the development of fiber optic sensor for real-time sensing of CaCO3 scale formation in geothermal water

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
Takuya OkazakiHideki Kuramitz

Abstract

This study proposes an optical fiber sensor for calcium carbonate (CaCO3) scale formation in water. The sensor is easily fabricated by removing the cladding of a multimode fiber to expose the core towards the surrounding medium in order to detect refractive index change. A variation of the transmittance response from the high refractive index of CaCO3 which precipitated on the fiber core surface was observed. The proposed setup can be used to analyze the transmittance response over wide range of wavelength using white light as a source and also a spectroscopy detector. The curve of the transmittance percentage over time showed that a fiber core with 200 μm has higher sensitivity as compared to a fiber core with 400 μm. The findings from this study showed that the sensor detection region at near infrared (NIR) wavelengths showed better sensitivity than visible light (VIS) wavelengths. Field tests were conducted using natural geothermal water at Matsushiro, Japan in order to verify the performance of the proposed sensor. The optical response was successfully evaluated and the analytical results confirmed the capability of monitoring scale formation in a geothermal water environment.

References

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Jan 31, 2008·Chemical Reviews·Colette McDonaghBrian D MacCraith
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Nov 13, 2012·Analytical Chemistry·Xu-Dong Wang, Otto S Wolfbeis

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Citations

Jun 15, 2017·Scientific Reports·Takuya OkazakiHideki Kuramitz
Aug 11, 2017·Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry·Tatsuya OriiHideki Kuramitz

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