Table 2 The comparison of final displacement values between MEMS and MEMS spherical monitoring device.

From: Monitoring subsurface soil displacement in karst collapse by designing a MEMS-based spherical monitoring device

Height

MEMS spherical monitoring device final

displacement values/mm

MEMS sensor final displacement

values/mm

h = 300 mm

B1

7.1

D1

7.8

B2

28.4

D2

16.4

B3

35.5

D3

28.7

B4

26.9

D4

31.3

h = 500 mm

B5

8.4

D5

7.6

B6

9.8

D6

7.0

h = 700 mm

B7

6.0

D7

5.4

B8

6.9

D8

5.3