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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

Absorbed state and received signal of a sensor probe.
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f8-sensors-12-10906: Absorbed state and received signal of a sensor probe.

Mentions: In Figure 8, the signal of the sensing connector is decreased about 3 dB because of the bending loss caused by the expansion of WCS absorbing water. The detection sensitivity of the sensor is governed by the relation between bending loss and water absorbance. Therefore, it is noteworthy that the maximum bending loss, sensor margin, of each sensor probe should be determined by considering the total power margin in order to operate the entire sensor probes through one optical fiber line. If it assumes that the bending loss is quite high even for absorbing a small amount of water, then the sensor probe is too sensitive. However, although a severe expansion of WCS material occurs, the bending loss is not fully developed because the water absorbing WCS becomes jellylike after absorbing water within several minutes in this experiment. Therefore, the relation of the bending loss with absorbing water should be carefully studied to design the whole multiplexing sensor system.


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)

Absorbed state and received signal of a sensor probe.
© Copyright Policy
Related In: Results  -  Collection

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

f8-sensors-12-10906: Absorbed state and received signal of a sensor probe.
Mentions: In Figure 8, the signal of the sensing connector is decreased about 3 dB because of the bending loss caused by the expansion of WCS absorbing water. The detection sensitivity of the sensor is governed by the relation between bending loss and water absorbance. Therefore, it is noteworthy that the maximum bending loss, sensor margin, of each sensor probe should be determined by considering the total power margin in order to operate the entire sensor probes through one optical fiber line. If it assumes that the bending loss is quite high even for absorbing a small amount of water, then the sensor probe is too sensitive. However, although a severe expansion of WCS material occurs, the bending loss is not fully developed because the water absorbing WCS becomes jellylike after absorbing water within several minutes in this experiment. Therefore, the relation of the bending loss with absorbing water should be carefully studied to design the whole multiplexing sensor system.

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