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 CCD

Image sensor format

1/2"

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 3.0

GigE

Array geometry

hexagonal

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

≤ 400

Maximum tilt, “fast search” mode

0.008 rad

0.014 rad

0.007 rad

Maximum tilt, slow mode (“fast search” is off)

0.066 rad

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**

120 fps**

Processing rate, slow mode ***

1 fps**

N/A

1 fps**

N/A

Recommended Zernike terms

≤ 44

≤ 300

≤ 100

Wavelength

400…900 nm

400…1000nm

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).