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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

Fiber optic sensor probes using three types of vessels.
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f6-sensors-12-10906: Fiber optic sensor probes using three types of vessels.

Mentions: In order to study the performance of the devised sensor probe, three types of sensor probes A, B and C, are fabricated using three vessels, as shown in Figure 6. The vessel of each sensor probe is filled with WCS of about 2 mm diameter and having a single mode optical fiber with 1 mm loose tube and a metal wire of the diameter of 1 mm, as shown in Figure 2. The vessels of the probes are also closed with mesh cloths having many holes of less than 1 mm in order to keep WCS and water passing through in the vessels. For making the bending loss of the fiber at the WCS expansion condition, the optical fiber is located on the mesh cloth and under the metal wire and with the crossing direction of the metal wire. The power loss due to connector reflection of each sensor probe is controlled at about 2.5 dB by tuning the reflectivity of the optical connectors.


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)

Fiber optic sensor probes using three types of vessels.
© Copyright Policy
Related In: Results  -  Collection

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

f6-sensors-12-10906: Fiber optic sensor probes using three types of vessels.
Mentions: In order to study the performance of the devised sensor probe, three types of sensor probes A, B and C, are fabricated using three vessels, as shown in Figure 6. The vessel of each sensor probe is filled with WCS of about 2 mm diameter and having a single mode optical fiber with 1 mm loose tube and a metal wire of the diameter of 1 mm, as shown in Figure 2. The vessels of the probes are also closed with mesh cloths having many holes of less than 1 mm in order to keep WCS and water passing through in the vessels. For making the bending loss of the fiber at the WCS expansion condition, the optical fiber is located on the mesh cloth and under the metal wire and with the crossing direction of the metal wire. The power loss due to connector reflection of each sensor probe is controlled at about 2.5 dB by tuning the reflectivity of the optical connectors.

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