Abstract: The micro-electro-mechanical system (MEMS) acceleration sensor has the advantages of small size, light weight, high measurement accuracy, and real-time monitoring, allowing it to achieve accurate angle measurement in centrifuge model tests. This paper introduces a centrifuge angle measurement system based on multi-axis MEMS sensors, including sensor measurement principle, system structure, and sensor characteristics. The typical spectrum of the basket was obtained by centrifuge vibration monitoring, and the feasibility of the system applied to centrifuge angle measurement was verified by a set of centrifuge static angle stability tests and dynamic accuracy tests. The results showed that the measurement error of the sensor was always less than 1% in the static test above 10g, and the measurement error was less than 0.5% when the centrifugal acceleration was stable at 40g; the centrifugal acceleration remained stable at 50g during the dynamic test, the sensor was highly consistent with the on-board angle encoder output, and the average error was 1.13%. The test results demonstrated that the angle-measuring system exhibits good response accuracy and stable performance, providing a novel method for angle monitoring in centrifuge tests. This system has a wide application prospect and significant value.

Key words: geotechnical centrifuge, MEMS sensors, angle measurement, performance verification