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Amplified OTDR systems for multipoint corrosion monitoring.

Nascimento JF, Silva MJ, Coêlho IJ, Cipriano E, Martins-Filho JF - Sensors (Basel) (2012)

Bottom Line: The sensor system is multipoint, self-referenced, has no moving parts and can measure the corrosion rate several kilometers away from the OTDR equipment.The first OTDR monitoring system employs a remotely pumped in-line EDFA and it is used to evaluate the increase in system reach compared to a non-amplified configuration.Our experimental results obtained under controlled laboratory conditions show the advantages of the amplified system in terms of longer system reach with better spatial resolution, and also that the corrosion measurements obtained from our system are not sensitive to 3 dB gain variations.

View Article: PubMed Central - PubMed

Affiliation: Polytechnic School of Pernambuco, University of Pernambuco (UPE), Recife, PE, Brazil. jehanfonseca@hotmail.com

ABSTRACT
We present two configurations of an amplified fiber-optic-based corrosion sensor using the optical time domain reflectometry (OTDR) technique as the interrogation method. The sensor system is multipoint, self-referenced, has no moving parts and can measure the corrosion rate several kilometers away from the OTDR equipment. The first OTDR monitoring system employs a remotely pumped in-line EDFA and it is used to evaluate the increase in system reach compared to a non-amplified configuration. The other amplified monitoring system uses an EDFA in booster configuration and we perform corrosion measurements and evaluations of system sensitivity to amplifier gain variations. Our experimental results obtained under controlled laboratory conditions show the advantages of the amplified system in terms of longer system reach with better spatial resolution, and also that the corrosion measurements obtained from our system are not sensitive to 3 dB gain variations.

No MeSH data available.


OTDR traces for the non-amplified (a) and amplified (b) multipoint sensor system of Figure 3 for different gains (17 dB and 20 dB).
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f4-sensors-12-03438: OTDR traces for the non-amplified (a) and amplified (b) multipoint sensor system of Figure 3 for different gains (17 dB and 20 dB).

Mentions: In Figure 4 we present the OTDR traces obtained from the experimental apparatus shown in Figure 3(a,b), where the numbered peaks correspond to sensor heads numbered from 1 to 6 in Figure 3. Moreover, Figure 3(b) shows results for two different EDFA gain values, 17 dB (dashed line) and 20 dB (solid line), obtained by changing the laser pump power at EDF, from 17 mW to 25 mW, respectively. For these measurements we used the OTDR pulsewidth of 50 ns. In a previous work [18] we have shown that the OTDR pulsewidth has no effect on the measurements of system gain. We also obtained the gain versus pump power curve and we found that for 25 mW pump power the EDFA reached its maximum gain of 20 dB [18].


Amplified OTDR systems for multipoint corrosion monitoring.

Nascimento JF, Silva MJ, Coêlho IJ, Cipriano E, Martins-Filho JF - Sensors (Basel) (2012)

OTDR traces for the non-amplified (a) and amplified (b) multipoint sensor system of Figure 3 for different gains (17 dB and 20 dB).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376602&req=5

f4-sensors-12-03438: OTDR traces for the non-amplified (a) and amplified (b) multipoint sensor system of Figure 3 for different gains (17 dB and 20 dB).
Mentions: In Figure 4 we present the OTDR traces obtained from the experimental apparatus shown in Figure 3(a,b), where the numbered peaks correspond to sensor heads numbered from 1 to 6 in Figure 3. Moreover, Figure 3(b) shows results for two different EDFA gain values, 17 dB (dashed line) and 20 dB (solid line), obtained by changing the laser pump power at EDF, from 17 mW to 25 mW, respectively. For these measurements we used the OTDR pulsewidth of 50 ns. In a previous work [18] we have shown that the OTDR pulsewidth has no effect on the measurements of system gain. We also obtained the gain versus pump power curve and we found that for 25 mW pump power the EDFA reached its maximum gain of 20 dB [18].

Bottom Line: The sensor system is multipoint, self-referenced, has no moving parts and can measure the corrosion rate several kilometers away from the OTDR equipment.The first OTDR monitoring system employs a remotely pumped in-line EDFA and it is used to evaluate the increase in system reach compared to a non-amplified configuration.Our experimental results obtained under controlled laboratory conditions show the advantages of the amplified system in terms of longer system reach with better spatial resolution, and also that the corrosion measurements obtained from our system are not sensitive to 3 dB gain variations.

View Article: PubMed Central - PubMed

Affiliation: Polytechnic School of Pernambuco, University of Pernambuco (UPE), Recife, PE, Brazil. jehanfonseca@hotmail.com

ABSTRACT
We present two configurations of an amplified fiber-optic-based corrosion sensor using the optical time domain reflectometry (OTDR) technique as the interrogation method. The sensor system is multipoint, self-referenced, has no moving parts and can measure the corrosion rate several kilometers away from the OTDR equipment. The first OTDR monitoring system employs a remotely pumped in-line EDFA and it is used to evaluate the increase in system reach compared to a non-amplified configuration. The other amplified monitoring system uses an EDFA in booster configuration and we perform corrosion measurements and evaluations of system sensitivity to amplifier gain variations. Our experimental results obtained under controlled laboratory conditions show the advantages of the amplified system in terms of longer system reach with better spatial resolution, and also that the corrosion measurements obtained from our system are not sensitive to 3 dB gain variations.

No MeSH data available.