Table 2 Other Relevant Studies

Mengru Jiao et al.²⁷

Piezoresistive

Polyimide

1.5 × 1.5 × 0.8 mm³

5

Aravamudhan et al.¹⁶

Piezoresistive

Pyrex glass

1.5 × 1.5 × 0.5 cm³

7

Xiang Chao et al.²⁸

Resonator

Steel shell

2.5 × 2.5 × 3 cm³

7

Jie Yu et al.¹⁵

Resonator

Steel shell

3 × 3 × 4 cm³

70

Haijun Wang et al.¹⁷

Capacitive (3-D printed)

Silicone adhesive

3 × 3 × 5 cm³

100

This work

Capacitive (MEMS)

PDMS

2.9 × 1.8 × 0.5 mm³

20