Wavefront Correction SystemHardware and Software

Wavefront Correction

CoudéScience Instruments

aO WFS

ContextViewer

aO RTControl System

Context ViewerControl System

HOAO WFS HOAO RT Control System

Observing Room

DMM10

FTTM5

Wavefront CorrectionControl System

M3

M1

M2 TelescopeControlSystemM6

HOAOAuxiliary PC

M5/M6 Tower

WFC Optical Bench, Coudé

WFC Optical Bench, Coudé

Wavefront Correction Coudé

CT

Optical Bench

aO

AO

DM (M10)

M5M5

CV

HOAOReal-timeController

DMDrivers

aO-C RTController

Motor Cntlrs

Monitor

Keyboard

HOAOAuxiliary PC

Beam Splitter Cooling

Controller

DMCooling

Controller

Coudé Floor

CT

Optical Bench

aO

AO

DM (M10)

CV

10

Wavefront Sensor

Point Source Extended Source

20x20 pixels

200x200 pixels

HOAO Wavefront Sensor

Lenslet Array Zoom

lensCameraFilters

Motor,Rotate

About X

Motor,Rotate

About Y

Motor,Close &Pinhole

Motor,TranslateAlong Z

Motor,TranslateAlong Z

Motor,TranslateAlong Y

Motor,TranslateAlong X

Motor,Rotate

About Z

Field Stop

Subaperture Images

DM1313 actuators

1232 subapertures20x20 pixels

Vision Research DS-10/DS-240

2000 fps, 1k x 1k.

10 bit ADC.

30k Well Depth

Streaming interface

14

Estimated operations

Dark field 20 pixels * 20 pixels subtractions = 400 subtractions= 800 memory reads= 400 memory writes

Flat Field 20 pixels * 20 pixels multiplies = 400 multiplies 20 pixels * 20 pixels shifts = 400 shifts

= 800 memory reads= 400 memory writes

Cross correlation 20 pixels * 20 pixels * 7 x shifts * 7 y shifts multiply/adds = 19600 multiply/adds= 39200 memory reads

Matrix multiplication 2 shifts * 1313 actuators multiply/adds = 2626 multiply/adds= 2626 memory reads= 2626 memory writes

Total operations per subaperture image = 70,278 operationsTotal operations per camera frame = 86,582,496 operations per frame

Total operations per second = 173,164,992,000 operations/sec

15

Test results

  Cycles μsecsPixel correction – dark and flat field 469 0.787x7 Cross Correlation 4,938 8.23Partial matrix multiplication 1,461 2.44Total for 20 subapertures (includes some other processing) 137,360 228.93

2000 frames per second = 500 microsecond period.

HOAO RealTime System

Host Computer

CAMERA

1000x1000

2000 fps

Tip/TiltMirror

DeformableMirror

64 DSPs – 600MHz,3.6 Gflops per second per DSP

NetworkWCCS

Bittware cPCI boardsWith 8 Analog DevicesTigershark DSPs each.

AuxiliaryPC

DSP Data Paths

Camera

Synchronous control word Reconstruction

DataReal Time DSPs

To TipTilt

To DM

To AuxPC

Real Time Data Processing

WFSCamera

XCORRSlope

Computation

Off ScaleSlope

Detection

MatrixMultiply

ActuatorServos

DeformableMirror

DarkField

FlatField

RefImage

OffScaleSlopeTol.

SlopeOffsets

Recon-structionMatrix

ServoPara-

meters

Tip TiltMirror

ActuatorGains

ActuatorOffsets

ModeControl

AverageSlope

Tip TiltServos

TelescopeControlSystem

ZernikeOff loadprocess

WavefrontControlSystem

Operating Parameters

Calibration Data

Real Time Processing

External Interface CommonServices

OffTTDMDM & TT

DataCollection

aO Lenslet Array

Images on Camera

2’ =192

pixels

1546 pixels

1344 Pixels

2’ =192

pixels

aO Subaperture Image

2’, 192 pixels

20”, 32 pixels

Subfield Positions

2’ =192

pixels20” =32 pixels

1546 pixels

1344 Pixels

DALSA 4M30

• 2300x1700 pixels

• 30 fps

• well depth 60,000e

RealTime Data Processing

WFSCamera

XCORRSlope

Computation

Off ScaleSlope

Detection

MatrixMultiply

DarkField

FlatField

RefImage

OffScaleSlopeTol.

SlopeOffsets

Recon-structionMatrix

ModeControl

TelescopeControlSystem

ZernikeOff loadprocess

WavefrontControlSystem

Operating Parameters

Calibration Data

Real Time Processing

External Interface CommonServices

DataCollection

GlobalInterlockSystem

Active Optics

Camera1546x1344

10 fps

Intel Processor PCLinux RT

FrameGrabber WCCS

Data and Control

aO

WCCSAverage Zernikes

Control

OperatorGUI

TCS

M1

M2

M3

M6

M1CS

TEOCS

FOCS

Mount