Browse > Article
http://dx.doi.org/10.5916/jkosme.2010.34.6.846

A Study on the Liquid-level Sensors Using Splitting Ratio of Fiber-optic Directional Couplers  

Sohn, Kyung-Rak (한국해양대학교 전자통신공학과)
Key, Kwang-Hyun (한국해양대학교 대학원 전자통신공학과)
Publication Information
Journal of Advanced Marine Engineering and Technology / v.34, no.6, 2010 , pp. 846-851 More about this Journal
Abstract
A liquid-air interface sensing system using the flat end surfaces of a fused-silica fiber coupler has been demonstrated. The principle is based on the additional optical loss caused by changing the refractive index of the external material at the boundary of the end face made of a fiber. The immersion characteristics of this system with respect to the different splitting ratios of the couplers were investigated to determine the sensitivity when it responses to water and air. These experimental data are very useful for selecting the coupling ratio of a coupler in order to develop a multiple sensing probe system. In the proposed sensor structure, it can be emphasize that the sensing probe can be appropriately arrayed on the basis of splitting ratio of the coupler. As a result, it is expected that the proposed liquid-air interface sensors can also be applied to monitor flooding that occurs in multiple areas at the same time.
Keywords
Fiber-optic sensor; Directional coupler; Splitting ratio; Immersion sensors; Snell's law;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 F. J. Arrequi, I. R. Matias, K. L. Cooper, and R. O. Clause, "Simultaneous measurement of humidity and temperature by combining a reflective intensity-based optical fiber sensor and a fiber Bragg grating," IEEE Sensors J., vol. 2, no. 5, pp. 482-487, 2002.   DOI   ScienceOn
2 P. Nath, H. K. Singh, P. Datta, and K. C. Sarma, "All-fiber optic sensor for measurement of liquid refractive index," Sens. Actuators A, 148, pp. 16-18, 2008.   DOI   ScienceOn
3 M. Lomer, J. Arrue, P. Aiestaran, and J. M. Lopez-Higuera, "Lateral polishing of bends in plastic optical fibers applied to a multipoint liquid-level measurement sensor," Sens. Actuators A, 137, pp. 68-73, 2007.   DOI   ScienceOn
4 K. H. Key, H. P. Kim, K. R. Sohn, "Development of optical dual-sensors for submersion monitoring using zigbee-based wireless sensor networks," J. of Kor. Sensors, vol. 19, no. 3, pp. 184-190, 2010.   과학기술학회마을   DOI   ScienceOn
5 S. K. Khijwania, V. S. Tiwari, F-Y. Yueh, and J. P. Sigh, "A fiber optic Raman sensor for hydrocarbon detection," Sens. Actuators A, vol. 125, pp. 563-568, 2007.   DOI   ScienceOn
6 A. A. Kazemi, C. Yang, and S. Chen, "Fiber optic cryogenic liquid level detection system for space application," Proc. of SPIE, vol. 7314, 73140A-1, 2009.
7 K. R. Sohn, "Liquid sensors using refractive intensity at the end-face of a glass fiber connected to fiber Bragg grating," Sens. Actuators A, vol. 158, pp. 193-197, 2010.   DOI   ScienceOn
8 C. Y, S. Chen, and G. Yang, "Fiber optical liquid level sensor under cryogenic environment," Sens. Actuators A, vol. 94, pp. 69-75, 2001.   DOI   ScienceOn