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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.

Cho TS, Choi KS, Seo DC, Kwon IB, Lee JR - Sensors (Basel) (2012)

Bottom Line: 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 sensor probe with a high output value provides a high sensitivity with various detection levels while the number of total installable sensor probes decreases.

View Article: PubMed Central - PubMed

Affiliation: Center for Safety Measurement, Korea Research Institute of Standards and Science, 1 Doryong-dong Yuseong-gu, Daejeon 305-340, Korea. tscho@kriss.re.kr

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.

No MeSH data available.


Related in: MedlinePlus

Sensor outputs according to injected water ratio of three types of probes.
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f11-sensors-12-10906: Sensor outputs according to injected water ratio of three types of probes.

Mentions: After studying the bending losses, the vessels with WCS are designed to ensure the sensor probe responses by having bending diameters of less than 24 mm according to the water absorption. Then, three sensor probes, A, B and C-type, are prepared to study the size effect of the probe shown in Figure 6. An amount of water (12 mL) is injected in the vessel by an injector at regular time intervals, about 5 minutes. The sensor outputs of these probes are investigated according to the amount of water absorption as shown in Figure 11. In the figure, the injected water ratio, γ, is defined as the volume of water normalized with respect to the volume of its own vessel. When more and more water is injected in the vessel, B-type probe shows the fastest response to water injection. A and B-type probes are starting to be responsive at the injected water ratio of 0.5. However, C-type probe is responsive from the injected water ratio of 0.7. Also, the B and C-type probes show some small declines in the sensor outputs after the injected water ratios of 0.7 and 1.1, respectively. These can be explained by the fact that the WCS material becomes jellylike after absorbing water. Therefore, it can be concluded that WCS material can't bend the optical fiber any even though more water is injected into the vessel. A-type probe might also show the same signal decline if some more water were provided.


Novel fiber optic sensor probe with a pair of highly reflected connectors and a vessel of water absorption material for water leak detection.

Cho TS, Choi KS, Seo DC, Kwon IB, Lee JR - Sensors (Basel) (2012)

Sensor outputs according to injected water ratio of three types of probes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472865&req=5

f11-sensors-12-10906: Sensor outputs according to injected water ratio of three types of probes.
Mentions: After studying the bending losses, the vessels with WCS are designed to ensure the sensor probe responses by having bending diameters of less than 24 mm according to the water absorption. Then, three sensor probes, A, B and C-type, are prepared to study the size effect of the probe shown in Figure 6. An amount of water (12 mL) is injected in the vessel by an injector at regular time intervals, about 5 minutes. The sensor outputs of these probes are investigated according to the amount of water absorption as shown in Figure 11. In the figure, the injected water ratio, γ, is defined as the volume of water normalized with respect to the volume of its own vessel. When more and more water is injected in the vessel, B-type probe shows the fastest response to water injection. A and B-type probes are starting to be responsive at the injected water ratio of 0.5. However, C-type probe is responsive from the injected water ratio of 0.7. Also, the B and C-type probes show some small declines in the sensor outputs after the injected water ratios of 0.7 and 1.1, respectively. These can be explained by the fact that the WCS material becomes jellylike after absorbing water. Therefore, it can be concluded that WCS material can't bend the optical fiber any even though more water is injected into the vessel. A-type probe might also show the same signal decline if some more water were provided.

Bottom Line: 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 sensor probe with a high output value provides a high sensitivity with various detection levels while the number of total installable sensor probes decreases.

View Article: PubMed Central - PubMed

Affiliation: Center for Safety Measurement, Korea Research Institute of Standards and Science, 1 Doryong-dong Yuseong-gu, Daejeon 305-340, Korea. tscho@kriss.re.kr

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.

No MeSH data available.


Related in: MedlinePlus