Fig. 1. Configuration of fiber optic F-P seismometer. (a) The seismometer’s structure. The mirror and trimmer are not plotted. (b) The F-P interferometer in the fiber optic seismometer.

Fig. 2. Mechanical equivalent model of the seismometer.

Fig. 3. Estimation of the MDS. The black solid line represents the MDS corresponding to demodulation accuracy, while the order lines represent the MDS corresponding to the NLNM at different resonance points.

Fig. 4. Evaluation of interference normalized intensity. Note that θ=0.1° is assumed.

Fig. 5. Evaluation of the fringe visibility. Note that θ=0.1° is assumed.

Fig. 6. Experiment setup. The red lines represent optical fibers, and the blue lines represent electric wires. The direction of the arrows represents the transmission of the signal.

Fig. 7. Result of the visibility of interference fringes.

Fig. 8. Power spectral density of phase noise of the F-P seismometer.

Fig. 9. Fitting effect of the transfer function. The circle is the transfer function obtained by the experiment, and the solid line is the fitting.

Fig. 10. Power spectral density of the acceleration noise of the F-P seismometer.