2025/12/11 by Tomofumi Shimoda, Shimoda, Tomofumi, Wataru Kokuyama +3
Engineering · Earth and Planetary Sciences · Physics and Astronomy · #Geophysics and Sensor Technology #Seismic Waves and Analysis #Pulsars and Gravitational Waves Research
paper · pdf · doi:10.48550/arxiv.2512.10771
Triaxial vibration sensor are widely used used in various application. Recently, low-cost sensors based on micro electro mechanical system (MEMS) technology are also becoming more widely adopted. However, their measurement accuracy can be affected by environmental factors such as temperature. In this study, we developed an environmental testing system integrated with a triaxial vibration exciter. The system can reproduce long-stroke, low-frequency triaxial vibrations -- such as those caused by huge earthquakes -- under temperatures ranging from -30~^\circC to +80~^\circC. Using this system, the measurement accuracy of vibration sensors can be evaluated under different environmental conditions. The system provides highly accurate reference measurements using a laser interferometer and reference accelerometers that are primarily calibrated within the system. The overall accuracy of the reference vibration measurement is estimated to be approximately 0.23~%. Based on these reference measurements, we investigated the accuracy of earthquake observations using a MEMS accelerometer as a demonstration. The system configuration and testing procedures are presented in this paper.