Standard configurations
Characteristics of three typical configurations of FrontSurfer wavefront sensor are given in the table below. However, the system can be reconfigured according to the customer’s requirements by choosing a different camera, Hartmann mask or microlens array.
Parameter |
Config. #1 |
Config. #2 |
Config. #3 |
Config. #4 |
---|---|---|---|---|
Camera model |
UI-2210SE |
UI-1540LE |
UI-3370CP |
piA640-210gm |
Camera type |
digital CCD |
digital CMOS |
digital CMOS |
digital CCD |
Image sensor format |
1/2" |
1/2" |
1" |
1/3" |
Pixel pitch |
9.9 um |
5.2 um |
5.5 um |
7.4 um |
Camera resolution |
640 x 480 |
1280 x 1024 |
2048 x 2048 |
640 x 480 |
Camera interface |
USB 2.0 |
USB 2.0 |
USB 3.0 |
GigE |
Array geometry |
hexagonal |
orthogonal |
orthogonal |
orthogonal |
Array pitch |
300 um |
150 um |
300 um |
150 um |
Array focal distance |
~ 18 mm |
10 mm |
18.6 mm |
10 mm |
Clear aperture |
3.9 mm |
≤ 4.5 mm |
≤ 9 mm |
≤ 3.5 mm |
Subapertures |
127 |
≤ 700 |
≤ 700 |
≤ 400 |
Maximum tilt, "fast search" mode |
0.008 rad |
0.014 rad |
0.007 rad |
0.007 rad |
Maximum tilt, slow mode ("fast search" is off) |
0.066 rad |
N/A |
N/A |
N/A |
Repeatability, RMS |
λ/300* |
λ/150* |
λ/300* |
λ/150* |
Repeatability, P-V |
λ/60* |
λ/20* |
λ/60* |
λ/20* |
Acquisition rate |
≥ 75 fps |
≥ 25 fps |
≥ 80 fps |
≥ 210 fps |
Processing rate, AO feedback *** |
25 fps** |
10 fps** |
10 fps** |
120 fps** |
Processing rate, slow mode *** |
1 fps** |
N/A |
1 fps** |
N/A |
Recommended Zernike terms |
≤ 44 |
≤ 300 |
≤ 300 |
≤ 100 |
Wavelength |
400...900 nm |
400...1000nm |
400...900nm |
400...900nm |
* For λ= 633 nm
** For low-order aberration analysis on a PC with AMD Athlon XP1800+ processor and 256 MB RAM
*** Processing rates are given for full frame modes. They can be further signinficantly increased in many cases by implementing subsampling and limiting AOI (Area Of Interest).