TABLE IV.
The −40-dB Image Width (mm) of B-Scan Images of the Point Target in Elevation/Array Directions Using Apertures of Different Element Pitches.
| Pitch (mm) | Uncomp | Rx | Tx | Tx + Rx | Ideal |
|---|---|---|---|---|---|
| Elevation pitch | |||||
| 0.6 × 0.6 | 7.9/6.8 | 4.7/5.2 | 4.2/2.6 | 2.6/2.6 | 2.4/2.4 |
| 1.8 × 0.6 | 7.9/6.8 | 4.7/5.1 | 4.4/2.7 | 2.7/2.6 | 2.4/2.4 |
| 3.0 × 0.6 | 7.9/6.8 | 5.4/5.4 | 4.5/2.7 | 2.6/2.6 | 2.4/2.4 |
| 4.2 × 0.6 | 7.9/6.8 | 5.6/5.5 | 4.5/2.8 | 2.7/2.6 | 2.4/2.4 |
| 5.4 × 0.6 | 7.9/6.8 | 6.6/5.9 | 5.0/4.8 | 4.2/2.8 | 2.4/2.4 |
| Square pitch | |||||
| 0.6 × 0.6 | 7.9/6.8 | 4.7/5.2 | 4.2/2.6 | 2.6/2.6 | 2.4/2.4 |
| 1.8 × 1.8 | 7.9/6.8 | 4.7/5.1 | 4.4/4.1 | 2.7/2.6 | 2.4/2.4 |
| 3.0 × 3.0 | 7.9/6.8 | 5.8/5.6 | 4.5/4.3 | 2.6/2.6 | 2.4/2.4 |
| 4.2 × 4.2 | 7.9/6.8 | 5.9/6.0 | 4.5/4.7 | 2.7/2.8 | 2.4/2.4 |
| 5.4 × 5.4 | 7.9/6.8 | 9.0/6.1 | 5.2/4.9 | 4.4/3.9 | 2.4/2.4 |
Uncomp = uncompensated; Rx = receive compensation; Tx = transmit compensation; Tx + Rx = full compensation.