Faraday Michelson Interferometers for Signal Demodulation of Fiber-Optic Sensors
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
We developed an all-fiber-based optical demodulator for the signal interrogation of low-coherence fiber-optic Fabry–Perot interferometric sensors. The optical demodulator consists of a Michelson interferometer implemented by using a 3×3 fiber coupler and two fiber-coupled Faraday reflectors with tunable fiber delay lines. The demodulator's output contains two optical interference signals with a constant phase shift and the output shows no sensitivity to the polarization variation in the light source or fibers. A digital phase recovery algorithm is used to extract the measurand information from the phase-shifted signals at high accuracy, high dynamic range, and high stability. The optical demodulator has been applied to the measurement of high-frequency vibrations and strains using fiber-optic sensors.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1785201
- Journal Information:
- Journal of Lightwave Technology, Journal Name: Journal of Lightwave Technology Journal Issue: 8 Vol. 39; ISSN 0733-8724
- Publisher:
- IEEECopyright Statement
- Country of Publication:
- United States
- Language:
- English