Abstract
A long period grating is interrogated with a fibre Bragg grating using a derivative spectroscopy technique. A quasi-linear relationship between the output of the sensing scheme and the curvature experienced by the long period grating is demonstrated, with a sensitivity of 5.05 m and with an average curvature resolution of 2.9 × 10-2 m-1. In addition, the feasibility of multiplexing an in-line series of long period gratings with this interrogation scheme is demonstrated with two pairs of fibre Bragg gratings and long period gratings. With this arrangement the cross-talk error between channels was less than ± 2.4 × 10-3 m-1.
Original language | English |
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Pages (from-to) | 44-48 |
Number of pages | 5 |
Journal | Measurement Science and Technology |
Volume | 15 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2004 |
Keywords
- long period grating
- fibre Bragg grating
- derivative spectroscopy technique
- sensing scheme
- curvature experienced