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 sens...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： 0dB=1rad/g） with a fluctuation ＋2dB in the frequency bandwidth of 5 Hz - 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 ±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated cartier （PGC） was 10-Srad/√Hz, and the minimum detectable acceleration was calculated to be 90 ng/√Hz.展开更多
文摘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： 0dB=1rad/g） with a fluctuation ＋2dB in the frequency bandwidth of 5 Hz - 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 ±2.5 dB. The minimum phase demodulation detection accuracy of the phase-generated cartier （PGC） was 10-Srad/√Hz, and the minimum detectable acceleration was calculated to be 90 ng/√Hz.
