Analysis of vibration correction performance of vibration sensor for absolute gravity measurement

Absolute gravity measurement refers to the of absolute value gravitational acceleration (<i>g</i>, approximately 9.8 m/s<sup>2</sup>). The precision is limited mainly by vibration noises. Vibration correction a simple and feasible way deal with noises, which corrects results detecting noises sensor. At present, performance different sensors lacks systematic analysis evaluation. In this paper, theoretical how sensor characteristics affect carried out. performances three sensors, two seismometers one accelerometer, are evaluated experimentally in cases experimental show that obtained using low-noise seismometer its bandwidth range. case I i.e. quiet environment, standard deviation corrected both can reach tens μGal (1 = 10<sup>–8</sup> m/s<sup>2</sup>), close an ultra-low-frequency isolator. However, II noisy increase hundreds due enhancement high-frequency components. This means deteriorate, narrower turns even worse. Moreover, cannot work III stronger range limitation. On other hand, accelerometer affected resolution on order mGal (1mGal 10<sup>–5</sup> Its or thousands hertz generally over ±2 g, large enough meet needs for dynamic applications. I, after larger than before correction. because intensity smaller self-noise so it could not be detected effectively accelerometer. II, sufficient detect effectively. reduced from 2822 1374 equal 0.1 100 drops. where amplitude noise rises m/s<sup>2</sup> work, still achieve 0.3 –1158 –285 34 3.3 mGal. Therefore, more suitable environment stable foundation, realize superior μGal, while appropriate complex mGal-level. Finally, present provide guidance selecting designing