| The relation between frequency and displacement of PD and OD | Frequency (Hz) | PD Displacement (m) | OD Displacement (m) |
|
| 2000 | 4.3095 × 10−6 | 4.3171 × 10−6 |
|
| 2250 | 4.3350 × 10−6 | 4.3453 × 10−6 |
|
| 2500 | 4.3638 × 10−6 | 4.3773 × 10−6 |
|
| 2750 | 4.3961 × 10−6 | 4.4133 × 10−6 |
|
| 3000 | 4.4321 × 10−6 | 4.4533 × 10−6 |
|
| 3250 | 4.4718 × 10−6 | 4.4977 × 10−6 |
|
| 3500 | 4.5156 × 10−6 | 4.5467 × 10−6 |
|
| 3750 | 4.5635 × 10−6 | 4.6004 × 10−6 |
|
| 4000 | 4.6159 × 10−6 | 4.6593 × 10−6 |
|
| 4250 | 4.6730 × 10−6 | 4.7237 × 10−6 |
|
| 4500 | 4.7351 × 10−6 | 4.7939 × 10−6 |
|
| 4750 | 4.8027 × 10−6 | 4.8705 × 10−6 |
|
| 5000 | 4.8759 × 10−6 | 4.9539 × 10−6 |