Abstract
A three-wavelength quadrature phase compensation method for recovering dynamic signals in extrinsic Fabry–Perot interferometers (EFPIs) is proposed and experimentally demonstrated. The influence of the direct current component is eliminated by using three symmetrical interferometric signals, and two orthogonal signals are obtained by the phase compensation algorithm to extract the phase change. A sinewave with a frequency of 1000 Hz was applied on an EFPI sensor. The cavity length of the EFPI sensor is 643.0299 μm. The demodulated signal is a sinewave with a frequency of 1000 Hz. The demodulated frequency shows good agreement with the frequency of the applied signal. This technique is suitable for measuring EFPI sensor cavity length changes under dynamic signals.
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