Table 3.
Digital image correlation specification details for the quasi-static and intermediate rate cases.
| Parameter | Quasi-static compression | 0.01 s−1 compression | 0.10 s−1 compression | 1.0 s−1 compression | 10 s−1 compression |
|---|---|---|---|---|---|
| Technique | Single camera q-factor Based Digital Image Correlation32 | ||||
| Lens | TitanTL 0.377× 22.5 mm telecentric | Sigma 105 mm Macro | |||
| Pre-filtering | Gaussian, [3px, 0.5] | ||||
| Min. Subset Size [px] | 32 | 16 | |||
| Min. Step Size [px] | 8 | 2 | |||
| Correlation criterion | Iterative FFT-based ZNCC | ||||
| Strain measurement | Global plane fitting | 9-tap optimal spatial differentiation filter | 13-tap optimal differentiation filter | ||
| Interpolation | Bicubic splines | ||||
| Camera noise [% full scale range] | 0.54 | 1.95 | 0.36 | 0.53 | 0.21 |
| Image size (approx.) [px by px] | 1900 × 350 | 400 × 100 | 320 × 100 | 320 × 100 | 400 × 100 |
| Measurement points | 39600 | 2825 | 2825 | 2825 | 7889 |
| Number of images | 650 (0.05 Hz) | 188 (6 Hz) | 200 (60 Hz) | 344 (500 Hz) | 201 (1500 Hz) |
| Pixel-to- μm conversion | 1 px = 9.15 μm | 1 px = 112 μm | 1 px = 112 μm | 1 px = 112 μm | 1 px = 112 μm |
| Noise floor [px] | 0.016 | 0.014 | 0.016 | 0.028 | 0.015 |
| Virtual strain gauge [mm] | ca. 18 | 5.38 | 5.38 | 5.38 | 7.77 |
The data for each column are drawn from a single example, usually the first run in the dataset, and are typical approximates. For more detailed interpretations of each parameter see Landauer et al. 201832 and more details for each experimental case are available in the full dataset.