Abstract
The performance of optical time-domain sensing technique, employing the slope of Brillouin dynamic gratings in polarization-maintaining fibers, is significantly enhanced using coherent pulse compression techniques. The strain sensitivity of the reflectivity of a coded probe, orthogonally polarized to the pumps which generated the grating, depends on both pumps and probe detuning. Employing a 64 bit Golay code, the system sensitivity was enhanced eightfold, while retaining the high sampling rate of 1MHz. We report the measurement of 750Hz strain vibrations (limited by the bandwidth of the vibration source) with a spatial resolution of 20cm (limited by the bandwidth of the balanced photoreceivers).
Original language | English |
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Title of host publication | 24th International Conference on Optical Fibre Sensors, OFS 2015 |
Editors | Hypolito Jose Kalinowski, Jose Luis Fabris, Wojtek J. Bock |
Publisher | SPIE |
ISBN (Electronic) | 9781628418392 |
DOIs | |
State | Published - 2015 |
Externally published | Yes |
Event | 24th International Conference on Optical Fibre Sensors, OFS 2015 - Curitiba, Brazil Duration: 28 Sep 2015 → 2 Oct 2015 |
Publication series
Name | Proceedings of SPIE - The International Society for Optical Engineering |
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Volume | 9634 |
ISSN (Print) | 0277-786X |
ISSN (Electronic) | 1996-756X |
Conference
Conference | 24th International Conference on Optical Fibre Sensors, OFS 2015 |
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Country/Territory | Brazil |
City | Curitiba |
Period | 28/09/15 → 2/10/15 |
Bibliographical note
Publisher Copyright:© 2015 SPIE.
Keywords
- Brillouin dynamic gratings
- Coherent pulse compression
- Fiber-optic sensors
- Nonlinear optics