Table 4 The relative error value of the vertical displacement of the sensors in test B and test D.
Sensor ID | Vertical displacement | Vertical displacement (PIV) | Relative error | Mean relative error | ||||
|---|---|---|---|---|---|---|---|---|
MEMS spherical monitoring device /mm | MEMS sensor /mm | MEMS spherical monitoring device /mm | MEMS sensor /mm | MEMS spherical monitoring device /% | MEMS sensor /% | MEMS spherical monitoring device /% | MEMS sensor /% | |
1 | 7.1 | 7.8 | 6.7 | 7.1 | 5.97 | 9.86 | 8.68 | 10.70 |
2 | 28.3 | 16.3 | 25.5 | 17.5 | 10.98 | – 6.86 | ||
3 | 36.4 | 28.7 | 32.1 | 29.8 | 13.40 | – 3.69 | ||
4 | 26.9 | 31.2 | 24.8 | 37.9 | 8.47 | – 17.68 | ||
5 | 7.4 | 7.6 | 7.9 | 7.0 | – 6.32 | 8.57 | ||
6 | 9.7 | 6.9 | 10.4 | 6.1 | – 6.73 | 13.11 | ||
7 | 6.0 | 5.3 | 5.5 | 4.7 | 9.09 | 12.77 | ||
8 | 6.4 | 5.2 | 5.9 | 4.6 | 8.47 | 13.04 | ||
