Calculate recommended 4-bar target sizes and spatial frequencies from sensor IFOV and collimator focal length for MRTD testing.
4-Bar Target Calculator
SBIR typically recommends targets at several fractions of the sensor Nyquist frequency. Enter the sensor IFOV and collimator focal length to generate the complete target set.
Calculated target sizes
| Nyquist Factor | Bar Width | Spatial Frequency |
|---|---|---|
| 0.20 F0 | ||
| 0.25 F0 | ||
| 0.35 F0 | ||
| 0.38 F0 | ||
| 0.40 F0 | ||
| 0.50 F0 | ||
| 0.60 F0 | ||
| 0.70 F0 | ||
| 0.75 F0 | ||
| 0.80 F0 | ||
| 0.95 F0 | ||
| 1.00 F0 | ||
| 1.20 F0 |
Target wheel limits
| Model | Maximum Bar Width |
|---|---|
| 312 | 0.1616 inches |
| 313, 316, and 317 | 0.2727 inches |
| 314 | 0.1252 inches |
| 315 | 0.4850 inches |
