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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.


Multipoint sensor system (a) without and (b) with amplification (remotely pumped in-line EDFA).
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f1-sensors-12-03438: Multipoint sensor system (a) without and (b) with amplification (remotely pumped in-line EDFA).

Mentions: Figure 1(a) shows the multipoint sensor system with 14 sensor heads, numbered from 1 to 14. It consists of an Optical Time Domain Reflectometer (OTDR Anritsu 9076B) operating at a wavelength of 1.55 μm, connected to a single mode fiber (2 km long), some optical couplers, an additional single mode fiber (25 km long, approximately) and a 5 dB attenuator. The couplers split the optical signal emitted by the OTDR so that a small fraction (1–10%) is directed onto the sensor heads. For the sake of simplicity, in this section the sensor heads are bare end cleaved fibers. The signals reflected by the sensor heads are detected by the OTDR as peaks in the OTDR trace. The 25 km long fiber and the optical attenuator were placed between the 6th and the 7th sensor head to simulate a situation where we have a first set of sensors placed closer to the OTDR and another set of sensors placed much further away. This is a typical situation where the long distance and the excess loss from the couplers can limit the system reach, making it difficult to obtain results for the sensor heads at the end of the system.


Amplified OTDR systems for multipoint corrosion monitoring.

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

Multipoint sensor system (a) without and (b) with amplification (remotely pumped in-line EDFA).
© Copyright Policy
Related In: Results  -  Collection

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

f1-sensors-12-03438: Multipoint sensor system (a) without and (b) with amplification (remotely pumped in-line EDFA).
Mentions: Figure 1(a) shows the multipoint sensor system with 14 sensor heads, numbered from 1 to 14. It consists of an Optical Time Domain Reflectometer (OTDR Anritsu 9076B) operating at a wavelength of 1.55 μm, connected to a single mode fiber (2 km long), some optical couplers, an additional single mode fiber (25 km long, approximately) and a 5 dB attenuator. The couplers split the optical signal emitted by the OTDR so that a small fraction (1–10%) is directed onto the sensor heads. For the sake of simplicity, in this section the sensor heads are bare end cleaved fibers. The signals reflected by the sensor heads are detected by the OTDR as peaks in the OTDR trace. The 25 km long fiber and the optical attenuator were placed between the 6th and the 7th sensor head to simulate a situation where we have a first set of sensors placed closer to the OTDR and another set of sensors placed much further away. This is a typical situation where the long distance and the excess loss from the couplers can limit the system reach, making it difficult to obtain results for the sensor heads at the end of the system.

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.