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Novel Fiber Optic Sensor Probe with a Pair of Highly Reflected Connectors and a Vessel of Water Absorption Material for Water Leak Detection
Center for Safety Measurement, Korea Research Institute of Standards and Science, 1 Doryong-dong Yuseong-gu, Daejeon 305-340, Korea
Department of Aerospace Engineering, Jeonbuk National University, Jeonju 561-756, Korea
* Author to whom correspondence should be addressed.
Received: 23 July 2012; in revised form: 3 August 2012 / Accepted: 3 August 2012 / Published: 7 August 2012
Abstract: The use of a fiber optic quasi-distributed sensing technique for detecting the location and severity of water leakage is suggested. A novel fiber optic sensor probe is devised with a vessel of water absorption material called as water combination soil (WCS) located between two highly reflected connectors: one is a reference connector and the other is a sensing connector. In this study, the sensing output is calculated from the reflected light signals of the two connectors. The first reflected light signal is a reference and the second is a sensing signal which is attenuated by the optical fiber bending loss due to the WCS expansion absorbing water. Also, the bending loss of each sensor probe is determined by referring to the total number of sensor probes and the total power budget of an entire system. We have investigated several probe characteristics to show the design feasibility of the novel fiber sensor probe. The effects of vessel sizes of the probes on the water detection sensitivity are studied. The largest vessel probe provides the highest sensitivity of 0.267 dB/mL, while the smallest shows relatively low sensitivity of 0.067 dB/mL, and unstable response. The sensor probe with a high output value provides a high sensitivity with various detection levels while the number of total installable sensor probes decreases.
Keywords: water leak detection; highly reflected connector; reference connector; sensing connector; sensor probe; water combination soil; vessel
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Cite This Article
MDPI and ACS Style
Cho, T.-S.; Choi, K.-S.; Seo, D.-C.; Kwon, I.-B.; Lee, J.-R. Novel Fiber Optic Sensor Probe with a Pair of Highly Reflected Connectors and a Vessel of Water Absorption Material for Water Leak Detection. Sensors 2012, 12, 10906-10919.
Cho T-S, Choi K-S, Seo D-C, Kwon I-B, Lee J-R. Novel Fiber Optic Sensor Probe with a Pair of Highly Reflected Connectors and a Vessel of Water Absorption Material for Water Leak Detection. Sensors. 2012; 12(8):10906-10919.
Cho, Tae-Sik; Choi, Ki-Sun; Seo, Dae-Cheol; Kwon, Il-Bum; Lee, Jung-Ryul. 2012. "Novel Fiber Optic Sensor Probe with a Pair of Highly Reflected Connectors and a Vessel of Water Absorption Material for Water Leak Detection." Sensors 12, no. 8: 10906-10919.