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STRONG MOTION MOLECULAR-ELECTRONIC ACCELEROMETER

Ivan V. Egorov

Abstract

During an earthquake, a strong ground motion arises not only in the focus, but it also extends over long distances. Strong motion data have to be used in the Earthquake Early Warning (EEW) for a quick response of rescue services and monitoring of building structures. As the speed of the waves propagation in the ground is sufficiently high (about a few km/s), the warning time must be little, but sufficient to alert the people. Structural and earthquake engineers can use strong motion data to verify or improve design codes. Also, since seismic sensors are becoming more common, it is now possible to correlate the expected damage with instrument readings. Molecular-electronic transfer (MET) accelerometers are increasingly competing with MEMS accelerometers to measure strong motion. Technology allows designing an accelerometer with a wide frequency range (0.05 to 150 Hz) and a maximum recorded signal +- 3g. At the same time, it has a low noise level of 1 ?g at 10 Hz, reaching dynamic range of 130 dB. This work studies the effect of large input signals on the parameters of a MET converter. A mathematical model including nonlinear parts for theoretical studies of the dependence of the output signal was produced. Also, experimental studies were conducted, including comparisons to similar MEMS accelerometers. Comparative data were obtained by several methods: ? on a shake table that can imitate an earthquake ? on a shake table that can produce strong sinusoidal vibration ? by using self-calibration. As a result, the data shown in the experimental part make it possible to use MET accelerometers in many areas where there is a strong motion.

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DOI resolver: doi.org/10.5593/sgem2019/1.1/s05.118

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