随着天文成像、光通讯及遥感探测等的迅速发展,光传输的大气湍流效应越来越引起人们的重视,湍流模拟器进行实验室模拟,可为工作于随机涨落介质(大气)中的光学仪器提供实验室条件下的测试和评价手段.Lexitek公司开发的湍流模拟器的功能是对入射光的位相进行调制,产生畸变的湍流波前,为待测光学系统提供模拟的大气湍流环境.
Turbulence Phase Plates
湍流模拟器的主要功能是产生动态像差. 美国Lexitek公司的湍流模拟器由湍流屏(相位板),旋转平台及马达控制器组成.
The surface is machined with the design optical path difference (OPD) scaled by 1/∆n. Optical windows with AR coatings are typically bonded to the sandwich for improved surface quality and parallelism.
SPECIFICATIONS
Transmission from 400-1600 nm
Dimensions to 300x150mm, 150mm diameter
Continuous phase surfaces machined with ball end mill, typically 1/32” diameter
Discontinuous phases with flat end mill
Surface height step 1.2 µm, 5 µm accurate
n range 0.01-0.05
Phase specified by numerical array provided by the customer or designed by Lexitek to your specifications (e.g., r0 in mm)
Unique phase for each part at no extra charge
TYPICAL PARAMETERS
Continuous surface with BK7 windows
100 mm diameter, 83 mm active area
22 mm thickness
4096x4096 phase array~20 µm phase grid/10 external surfaces
Broadband AR coating <0.6% reflection
15 arcsec parallelism, 30 arcsec max
OPD step 0.02 µm, 0.09 µm accurate
OPD range 5-30 µm (min-max)
STAGE PARAMETERS WITH STEPPER MOTOR DRIVE
| |
HS-100 |
LS-100 |
LS-100-SU |
LS-50 |
| Motor Steps |
200 |
400 |
200 |
400 |
| Gear Ratio |
3:1 |
6:1 |
6:1 |
4:1 |
| Motor Torque oz-in |
83 |
4 |
45 |
16 |
| Motor Size |
Nema 17 |
Nema 14 |
Nema 17 |
Nema 17 |
| Guaranteed Speed (rpm) |
300 |
10 |
100 |
100 |
| Typical Max Speed (rpm) |
>400 |
>40 |
>200 |
>200 |
| Travel |
360° |
360° |
360° |
360° |
| Approx. Weight (lbs) |
5.5 |
3.5 |
4.5 |
2.5 |
| Max Part Diameter |
100mm/4" |
100mm/4" |
100mm/4" |
50mm/2" |
| Clear Aperture* |
3.75" |
3.75" |
3.75" |
1.75" |
| Microsteps |
1, 2, 4, 8 |
1, 2, 4, 8 |
1, 2, 4, 8 |
1, 2, 4, 8 |
| Full Steps/Rev |
600 |
1200 |
2400 |
1600 |
| Max Microsteps/Rev |
4800 |
19200 |
9600 |
12800 |