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Proceedings Paper

Development and assessment of a fiber-optic liquid level sensor with long-period fiber grating and Shewhart control charts
Author(s): Jian-Neng Wang; Chen-Han Jan; Jaw-Luen Tang; Wei-Te Wu; Der-Cheng Chen; Chien-Hsing Chen; Jial-Yan Syu; Ching-Ying Luo
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Paper Abstract

This paper presents the development and assessment of a liquid level sensor using long-period fiber grating (LPFG) technology and Shewhart control charts. The 22-mm LPFGs were fabricated with the point-by-point CO2 laser engraving method. This sensor was designed in such a way that it could be moved up and down with a position controller. The experimental section covered LPFG position sensing test, liquid level detection capacity and reliability measurements, and sensing resolution evaluation. LPFG position sensing test was studied and confirmed by the resonance wavelength shifts which were significantly generated when 75% of the LPFG was immersed in water. There were ten groups of different liquid level capacity testing and each group underwent ten repeated measurements. Based on Shewhart control charts including an X-bar chart, s chart, and R chart, the results showed all measurands within the upper and lower control limits. This sensor was reliable and the liquid level could be measured at least 1000 mm. The transmission loss versus the percent of immersion of the LPFG sensor for water and green tea was used to study the sensing resolution. The findings show the LPFG-based liquid sensor had at least 1000-mm level measurement capacity and about 2-mm resolution.

Paper Details

Date Published: 15 November 2011
PDF: 10 pages
Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 83212G (15 November 2011); doi: 10.1117/12.905055
Show Author Affiliations
Jian-Neng Wang, National Yunlin Univ. of Science and Technology (Taiwan)
Chen-Han Jan, National Taiwan Univ. (Taiwan)
Jaw-Luen Tang, National Chung Cheng Univ. (Taiwan)
Wei-Te Wu, National Pingtung Univ. of Science and Technology (Taiwan)
Der-Cheng Chen, Ching Yun Univ. (Taiwan)
Chien-Hsing Chen, National Chung Cheng Univ. (Taiwan)
Jial-Yan Syu, National Yunlin Univ. of Science and Technology (Taiwan)
Ching-Ying Luo, National Yunlin Univ. of Science and Technology (Taiwan)


Published in SPIE Proceedings Vol. 8321:
Seventh International Symposium on Precision Engineering Measurements and Instrumentation
Kuang-Chao Fan; Man Song; Rong-Sheng Lu, Editor(s)

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