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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

Schematic diagram of MOL-FOS using OTDR. (a) Configuration of MOL-FOS, WCS: Water combination soil; (b) The intensity of the received light.
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f1-sensors-12-10906: Schematic diagram of MOL-FOS using OTDR. (a) Configuration of MOL-FOS, WCS: Water combination soil; (b) The intensity of the received light.

Mentions: A multiplexed optical loss based fiber optic sensor (MOL-FOS) using OTDR with new sensor probes for sensing reflected signals and measuring a position as shown in Figure 1. The sensor probe has a pair of highly reflected connectors: the first one is a reference connector and the second one is a sensing connector as shown in Figure 1(a). If the pulsed light meets the reference connector and the sensing connector, then some portion of the pulsed light shall be reflected at the connectors. The rest of the pulsed light can travel through the optical fiber line to operate other sensor probes. Figure 1(b) shows the reflected lights from two connectors. If water leakage induces the bending of the optical fiber between the reference connector and the sensing connector, then the bending causes some optical loss between the two connectors (blue line). This optical loss can be detected by the reflected light decrease of the sensing connector. Also, when the light is decreased at the front of the reference connector, then the reflected light signal can indicate the decrease of the effective light intensity. Therefore, if the relation between the water leakage and the change of the sensing signal can be found, then the water leakage can be detected from this fiber optic sensor. It is noteworthy that our sensor probes are a kind of leak detector. Thus, we deploy the sensors in the field and check whether the event occurs or not. If the event happens, the sensors should be exchanged for new ones.


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)

Schematic diagram of MOL-FOS using OTDR. (a) Configuration of MOL-FOS, WCS: Water combination soil; (b) The intensity of the received light.
© Copyright Policy
Related In: Results  -  Collection

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

f1-sensors-12-10906: Schematic diagram of MOL-FOS using OTDR. (a) Configuration of MOL-FOS, WCS: Water combination soil; (b) The intensity of the received light.
Mentions: A multiplexed optical loss based fiber optic sensor (MOL-FOS) using OTDR with new sensor probes for sensing reflected signals and measuring a position as shown in Figure 1. The sensor probe has a pair of highly reflected connectors: the first one is a reference connector and the second one is a sensing connector as shown in Figure 1(a). If the pulsed light meets the reference connector and the sensing connector, then some portion of the pulsed light shall be reflected at the connectors. The rest of the pulsed light can travel through the optical fiber line to operate other sensor probes. Figure 1(b) shows the reflected lights from two connectors. If water leakage induces the bending of the optical fiber between the reference connector and the sensing connector, then the bending causes some optical loss between the two connectors (blue line). This optical loss can be detected by the reflected light decrease of the sensing connector. Also, when the light is decreased at the front of the reference connector, then the reflected light signal can indicate the decrease of the effective light intensity. Therefore, if the relation between the water leakage and the change of the sensing signal can be found, then the water leakage can be detected from this fiber optic sensor. It is noteworthy that our sensor probes are a kind of leak detector. Thus, we deploy the sensors in the field and check whether the event occurs or not. If the event happens, the sensors should be exchanged for new ones.

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