An all-metal 3-component optical fiber seismometer was proposed and experimentally demonstrated. The theoretical analysis was given based on the electro-mechanical theory. Calibration results showed that the axis sensitivity was about 41 dB (re: 0 dB=1 rad/g) with a fluctuation Ã?±2 dB in the frequency bandwidth of 5 Hzââ?¬â??400 Hz. A transverse sensitivity of about ?40 dB was achieved. The fluctuation of the acceleration sensitivity for the three accelerometers in the seismometer was within Ã?±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated carrier (PGC) was 10?5 rad/?Hz, and the minimum detectable acceleration was calculated to be 90 ng/?Hz.
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