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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

Dynamic range of MOL-FOS.
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f5-sensors-12-10906: Dynamic range of MOL-FOS.

Mentions: Figure 5 shows reflected signals acquired from the MOL-FOS. As shown in the figure, the dynamic range is around 17 dB. The level of a backscattered signal power is −36 dBm. PTX + ΓR is −26 dBm, PTH is −43 dBm, and Lc,1 and Lc,2 is 2.5 and 1 dB, respectively. If we don't employ a sensing connector at the sensor probes, the dynamic range will be 7 dB (= −36 dB + 43 dB) since the reflected signal from a sensing connector will disappear. If we set Lc and Lb to 2 and 2 dB, and optical fiber loss is less than 1 dB, then the number of installable sensor probes will be 4. The number of sensor probes that can be installed on one optical fiber line, 4, is noteworthy. If it is necessary to provide sensor probes higher dynamic ranges, then the total number of sensors on one optical fiber line should be decreased to provide more power to each sensor probe.


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)

Dynamic range of MOL-FOS.
© Copyright Policy
Related In: Results  -  Collection

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

f5-sensors-12-10906: Dynamic range of MOL-FOS.
Mentions: Figure 5 shows reflected signals acquired from the MOL-FOS. As shown in the figure, the dynamic range is around 17 dB. The level of a backscattered signal power is −36 dBm. PTX + ΓR is −26 dBm, PTH is −43 dBm, and Lc,1 and Lc,2 is 2.5 and 1 dB, respectively. If we don't employ a sensing connector at the sensor probes, the dynamic range will be 7 dB (= −36 dB + 43 dB) since the reflected signal from a sensing connector will disappear. If we set Lc and Lb to 2 and 2 dB, and optical fiber loss is less than 1 dB, then the number of installable sensor probes will be 4. The number of sensor probes that can be installed on one optical fiber line, 4, is noteworthy. If it is necessary to provide sensor probes higher dynamic ranges, then the total number of sensors on one optical fiber line should be decreased to provide more power to each sensor probe.

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