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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 output of A-type probe as a function of water injection time.
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f12-sensors-12-10906: Sensor output of A-type probe as a function of water injection time.

Mentions: For investigating the multiplexing operation of two sensor probes, three different configurations are prepared with A-A, B-B, C-C type probes connected on one optical fiber line. The experiment is performed by dropping water on the vessel of sensor probe #1 at time intervals of 1 minute eight times and, after dropping water on the vessel of the probe #1, water continuously is dropped on the vessel of the probe #2 at the time interval of 1 minute eight times. The responses of A-A, B-B, and C-C probe multiplexing are shown in Figures 11–13 for the three probe types. Figure 11 shows the result of sensor output S for the multiplexing response of two A-type probes. As shown in the graph, the probe #1 starts to respond gradually from 3 minutes to 8 minutes. The response rate of the probe #1 is determined as 0.8 dB/min in the linear response range of the graph, then, the sensitivity of the probe #1 can be found as 0.267 dB/mL which is calculated by using 3 mL of water instead of 1 minute of time. After showing the response of the probe #1, water is dropped on the vessel of the probe #2 at the time of 8 minutes in Figure 12. The response of the probe #2 shows slightly bigger than that of the probe #1. In the meantime, the multiplexing response of two B-type probes is also shown in Figure 13. In this figure, the response rate of probe #1 is 0.7 dB/min, and then, the sensitivity is 0.233 dB/mL. The probe #2 responds slightly quicker than the probe #1, also the response of this probe is bigger than the probe #1 caused from the probe uncertainty. In Figure 13, there is an unexpected point between 10 and 12 min. We think that it comes from the uncertainty of the expansion time of WCS material. Finally, in Figure 14, the response rate of probe #1 is 0.2 dB/min, and the sensitivity is 0.067 dB/mL. However, the response rate of the probe #2 appears to be slightly quicker than that of the probe #1, which is caused by the uncertainty of probe #2.


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 output of A-type probe as a function of water injection time.
© Copyright Policy
Related In: Results  -  Collection

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

f12-sensors-12-10906: Sensor output of A-type probe as a function of water injection time.
Mentions: For investigating the multiplexing operation of two sensor probes, three different configurations are prepared with A-A, B-B, C-C type probes connected on one optical fiber line. The experiment is performed by dropping water on the vessel of sensor probe #1 at time intervals of 1 minute eight times and, after dropping water on the vessel of the probe #1, water continuously is dropped on the vessel of the probe #2 at the time interval of 1 minute eight times. The responses of A-A, B-B, and C-C probe multiplexing are shown in Figures 11–13 for the three probe types. Figure 11 shows the result of sensor output S for the multiplexing response of two A-type probes. As shown in the graph, the probe #1 starts to respond gradually from 3 minutes to 8 minutes. The response rate of the probe #1 is determined as 0.8 dB/min in the linear response range of the graph, then, the sensitivity of the probe #1 can be found as 0.267 dB/mL which is calculated by using 3 mL of water instead of 1 minute of time. After showing the response of the probe #1, water is dropped on the vessel of the probe #2 at the time of 8 minutes in Figure 12. The response of the probe #2 shows slightly bigger than that of the probe #1. In the meantime, the multiplexing response of two B-type probes is also shown in Figure 13. In this figure, the response rate of probe #1 is 0.7 dB/min, and then, the sensitivity is 0.233 dB/mL. The probe #2 responds slightly quicker than the probe #1, also the response of this probe is bigger than the probe #1 caused from the probe uncertainty. In Figure 13, there is an unexpected point between 10 and 12 min. We think that it comes from the uncertainty of the expansion time of WCS material. Finally, in Figure 14, the response rate of probe #1 is 0.2 dB/min, and the sensitivity is 0.067 dB/mL. However, the response rate of the probe #2 appears to be slightly quicker than that of the probe #1, which is caused by the uncertainty of probe #2.

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