Table 4.
Evaluations of the first group.
| L (mm) | Medium | V1 (V) | V2 (V) | V3 (V) | (V) | |ΔE| (V) | Vd (V) |
|---|---|---|---|---|---|---|---|
| 10 | Water | 5.20 | 5.12 | 5.84 | 5.39 | 0.30 | 2.19 |
| Air | 7.60 | 7.68 | 7.44 | 7.57 | 0.09 | ||
| 15 | Water | 3.88 | 2.80 | 2.84 | 3.17 | 0.47 | 2.37 |
| Air | 5.40 | 5.56 | 5.68 | 5.55 | 0.10 | ||
| 20 | Water | 3.24 | 3.44 | 3.52 | 3.40 | 0.11 | 2.84 |
| Air | 6.28 | 6.28 | 6.16 | 6.24 | 0.05 | ||
| 25 | Water | 4.24 | 4.24 | 4.32 | 4.27 | 0.04 | 3.25 |
| Air | 7.76 | 7.28 | 7.52 | 7.52 | 0.16 | ||
| 30 | Water | 2.60 | 2.80 | 3.00 | 2.80 | 0.13 | 2.20 |
| Air | 4.68 | 4.96 | 5.36 | 5.00 | 0.24 | ||
| 40 | Water | 2.32 | 2.60 | 2.88 | 2.60 | 0.19 | 1.60 |
| Air | 3.96 | 4.16 | 4.48 | 4.20 | 0.19 | ||
| 50 | Water | 2.36 | 2.32 | 2.48 | 2.39 | 0.06 | 1.49 |
| Air | 3.64 | 3.84 | 4.16 | 3.88 | 0.19 |
V1: The first measured voltage value; V2: The second measured voltage value; V3: The third measured voltage value; : The average values; |ΔE|: The average deviations; Vd: The difference values.