Photonic Sensors, 2014, 4 (2): 102, Published Online: Apr. 9, 2014
Fiber Optic 3-Component Seismometer
Abstract
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 ±2 dB 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 carrier (PGC) was 10-5 rad/√Hz, and the minimum detectable acceleration was calculated to be 90 ng/√Hz.
Jing HAN, Wentao ZHANG*, Dongshan JIANG, Zhaogang WANG, Fang LI. Fiber Optic 3-Component Seismometer[J]. Photonic Sensors, 2014, 4(2): 102.