Table 1.
Diffusion efficiencies (%) of the 1-mm-diam, 3-cm-long diffusers over axial distances of 1, 2, and 3 cm (values separated by commas)a for various nozzle-to-sample distances (D=1,2, and 3 cm), nozzle translation speeds (S=1,2, and 3 mm/s), and blasting pressures (P=10, 30, and 50 psi).
| D=1 cm | D=2 cm | D=3 cm | ||
|---|---|---|---|---|
| S=1 mm/s | ||||
| P=10 psi | 39, 71, 91 (9) | 12, 31, 60 (40) | 5, 10, 18 (82) | |
| P=30 psi | 75, 94, 98 (2) | 70, 91, 97 (3) | 13, 29, 47 (53) | |
| P=50 psi | 54, 81, 90 (10) | 77, 90, 94 (6) | 63, 89, 96 (4) | |
| S=2 mm/s | ||||
| P=10 psi | 10, 29, 62 (38) | 13, 26, 41 (59) | 6, 13, 23 (77) | |
| P=30 psi | 25, 55, 79 (21) | 45, 73, 90 (10) | 40, 68, 86 (14) | |
| P=50 psi | 39, 74, 91 (9) | 67, 91, 96 (4) | 61, 87, 96 (4) | |
| S=3 mm/s | ||||
| P=10 psi | 17, 32, 51 (49) | 13, 31, 49 (51) | 1, 6, 12 (88) | |
| P=30 psi | 25, 45, 65 (35) | 32, 63, 81 (19) | 17, 31, 47 (53) | |
| P=50 psi | 43, 69, 82 (18) | 58, 89, 98 (2) | 55, 83, 94 (6) | |
The first three values represent the percentage of incident light emitted over the first 1 cm of diffuser length, the first 2 cm of diffuser length, and the entire 3 cm, respectively. The fourth value (in parentheses) represents the percentage of incident light exiting the distal end of the diffuser and is equal to the difference between the diffusion efficiency over 3 cm and 100%. For example, a perfectly uniform diffuser with a diffusion efficiency of 90% over 3 cm would have values of 30, 60, and 90% with 10% exiting the distal end.