Abstract
A three-wavelength method is developed to interrogate an extrinsic Fabry-Pérot interferometer (EFPI) for the measurement of a dynamic measurand. Three signals 120 deg out of phase are created by using three fiber Bragg gratings (FBGs A phase demodulator, which is the same as that used for demodulating a 3x3 coupler-based interferometer, is used to measure the phase change. A minimum detectable phase Of 0.43 μrad/Hz1/2 is achieved.
Original language | English |
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Article number | 064401 |
Journal | Optical Engineering |
Volume | 48 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2009 |
Keywords
- Extrinsic fabry-pérot interferometer (efpi)
- Fiber bragg grating fbg
- Fiber-optic sensors