Fiber-optic extrinsic Fabry-Perot interlerometer sensors with three-wavelength digital phase demodulation

Markus Schmidt

doi:10.1117/12.2302040

1 September 1999 Fiber-optic extrinsic Fabry-Perot interlerometer sensors with three-wavelength digital phase demodulation

Markus Schmidt

Author Affiliations +

Proceedings Volume 3746, 13th International Conference on Optical Fiber Sensors; 37461E (1999) https://doi.org/10.1117/12.2302040
Event: 13th International Conference on Optical Fiber Sensors, 1999, Kyongju, Korea, Republic of

Abstract

A superluminescent diode based three-wavelength passive quadrature phase demodulation scheme which uses microcontroller based real time arctan - calculation has been developed for readout of fiber-optic EFPI - vibration, acoustic and strain sensors. Quasistatic strain and dynamic vibration sensing with up to 80 kHz sampling rate is demonstrated. Nonlinearities in the %-range by dephasing of the nominally π/2 phase shifted interference signals with increasing fringe number is corrected for with a suitable algorithm resulting in significant improvement of the phase - strain characteristic.

Citation Download Citation

Markus Schmidt "Fiber-optic extrinsic Fabry-Perot interlerometer sensors with three-wavelength digital phase demodulation", Proc. SPIE 3746, 13th International Conference on Optical Fiber Sensors, 37461E (1 September 1999); https://doi.org/10.1117/12.2302040

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