| 1. |
- Carvalho, Isabel C. S., et al.
(författare)
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Pockels fibers by optical poling
- 2015
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Ingår i: Workshop on Specialty Optical Fibers and their Applications 2015. - Washington, D.C. : OSA. - 9781943580057
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Konferensbidrag (refereegranskat)abstract
- Silica fibers with internal electrodes biased with HV are poled when simultaneously excited by green light. The x(2) induced measured through the Pockels effect at 1.55 μm reaches ~0.11 pm/V. Poling and erasure are studied.
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| 2. |
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| 3. |
- Gladyshev, Alexey V., et al.
(författare)
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Second-order nonlinearity in optical fibers : Achievements and perspectives
- 2016
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Ingår i: Optics InfoBase Conference Papers. - 9781943580170
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Konferensbidrag (refereegranskat)abstract
- Recent progress in thermal poling of silica fibers is reviewed. It is demonstrated that state-of-the-art poled fibers can be used in a number of practical applications. Challenges for further development of poled fiber devices are discussed and possible solutions proposed.
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| 4. |
- Graziosi, Marcello, et al.
(författare)
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Electric field measurement with poled fiber in a sagnac interferometer
- 2013
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Ingår i: Optics InfoBase Conference Papers. - Washington, D.C. : Optical Society of America (OSA). - 9781557529848
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Konferensbidrag (refereegranskat)abstract
- E-field sensing with a thermally poled fiber in a Sagnac interferometer is presented. Contactless detection is achieved for fields > 0:23MV=m at 50Hz and higher sensitivity is obtained at higher frequencies.
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| 5. |
- Hyllander, Gunilla, et al.
(författare)
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Innovative measurement technique for raceway monitoring
- 2012
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Ingår i: 6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore. - 9781627480215 ; , s. 1732-1743
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Konferensbidrag (refereegranskat)abstract
- When raceway conditions are changed, e.g blast parameters or selection of injection material, additional measurements and monitoring of raceway can support evaluation of the effects on raceway conditions. Two types of measurement methods have been tested during injection trials with BF flue dust at the SSAB EMEA BF in Oxelösund and the LKAB Experimental Blast Furnace (EBF®). The raceway depth was measured using microwave technique and a camera was installed for viewing the raceway when the peep hole was occupied by the depth measurements equipment. Temperature estimation was made on thermal radiation guided via an optical fibre from the raceway to a spectrometer. Evaluation methods were developed based on Planck radiation law. The measurement techniques and their use for monitoring of raceway conditions are discussed.
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| 6. |
- Lopez-Cortes, Daniel, et al.
(författare)
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All-fiber Kerr cell
- 2012
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Ingår i: Optics Letters. - : IEEE. - 0146-9592 .- 1539-4794. ; 37:15, s. 3288-3290, s. 3288-3290
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Tidskriftsartikel (refereegranskat)abstract
- An all-fiber nanosecond Kerr light gate is described that was constructed using microstructured fibers. The switching voltage for a 20 cm long device is as low as Vp ∌ 85 V at a 1.06 Όm wavelength. The device is fully spliced. The active element is a three-hole fiber provided with internal electrodes in the side-holes and a liquid core of nitrobenzene, which is fully enclosed. This work allows the exploiting of electrically driven liquid-core fibers and demonstrated the removal of the major limitations of Kerr cells in the past, allowing for integration, safe use, and relatively low switching voltage.
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| 7. |
- Malmström, Mikael, et al.
(författare)
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All-Fiber Nanosecond Gating for Time-Resolved Spectral Analysis
- 2016
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 28:8, s. 829-832
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Tidskriftsartikel (refereegranskat)abstract
- We demonstrate the addition of time gating to a standard optical spectrum analyzer (OSA) operating in the spectral region ∼ 1.06 μm. This is accomplished by opening for 7 ns the optical input to the OSA with an electrically driven poled fiber in a Sagnac loop. The sequential interrogation with nanosecond resolution of the reflection from three fiber Bragg gratings along a piece of fiber allows distinguishing the spectral peaks created with a minimum separation of 85 cm. The passive extinction ratio of this device is >40 dB and returns to >40 dB from >23 dB on a 35-ns time scale directly after time gating.
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| 8. |
- Margulis, Walter, et al.
(författare)
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Electrically controlled fibers
- 2012
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Ingår i: Technical Digest - 2012 17th Opto-Electronics and Communications Conference, OECC 2012. - : IEEE. - 9781467309776 ; , s. 803-804
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Konferensbidrag (refereegranskat)abstract
- Fibers with internal electrodes are driven electrically. They allow for the control of polarization, wavelength tuning, nanosecond light gating, Q-switching and mode-locking of lasers. These are some of the applications discussed in this paper.
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| 9. |
- Noharet, Bertrand, et al.
(författare)
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Spectroscopy-based photonic instrumentation for the manufacturing industry: Contactless measurements of distances, temperatures, and chemical composition
- 2014
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Konferensbidrag (refereegranskat)abstract
- The steady progress in photonic components in terms of cost-to-performance ratio, maturity and robustness opens new avenues for the commercial deployment of photonic sensor systems in a wide range of industrial applications. Advanced sensing can be used to optimize complex processes and thereby enable significant savings in energy consumption. Three cases of robust photonic instrumentation for process optimization and quality control in manufacturing industries are presented: improved metal recycling with laser-induced breakdown spectroscopy, quality control in precision machining by white-light interferometry with optical fiber probes embedded in machining tools, and process optimization in steel foundries by stand-off temperature measurements in blast furnaces with optical fiber lances and spectral analysis techniques. Each of these methods utilizes a low-cost spectrometer, and requires dedicated calibration and signal processing methods to guarantee robust operation in industrial environments with varying conditions. Experimental results are presented, including on-line steel alloy analysis with correct classification rates in excess of 95%, distance measurements with axial resolution of +/- 2nm over a 75μm range, and continuous temperature monitoring of molten steel in oxygen blast furnaces with temperature measurement accuracy better than 1%.
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| 10. |
- Pereira, Joao, et al.
(författare)
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High-voltage fiber sensor based on fiber Bragg grating in poled fiber
- 2019
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE. - 9781510631236 - 9781510631243
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Konferensbidrag (refereegranskat)abstract
- Fiber Bragg gratings (FBGs) in a poled silicate fiber are used to detect external voltage applied to the fiber's internal electrodes. This work shows a basic proof-of-concept of a single-ended, fiber-based voltage sensor that can be used to measure periodic high-voltage signals. The setup can be extended to a multiplexed e-field interrogation system and used in the electric power industry for remote sensing of transmission lines and power plants..
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