Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m...

17
CHARA Collaboration Year-Seven Science Review Telescope Alignment and Wavefront Sensing Laszlo Sturmann Atlanta 2011

Transcript of Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m...

Page 1: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

Telescope Alignment and Wavefront SensingLaszlo Sturmann

Atlanta 2011

Page 2: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

• 2001-2010 Wavefront is computed from its Laplacian (Roddier)

• 2010 Wavefront is computed from its gradient (Shack-Hartmann Sensor)

Wavefront Evaluation at CHARA

ef

FrontSurfer

not for alignment

better for alignment

Page 3: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

Optical Setup

25 mm eyepiece

reticle

LED

projector

beam splitterfocal plane

green filter

40 mm collimator

WFS

OKO Standard Config. #1

Hexagonal array

127 lenses,0.3 mm pitch

F=18 mm.

CCD

FrontSurfer

Wavefront expanded into Zernike polynomials

Page 4: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

Eye Video camera

collimator

eyepiece

reticle

projector

TAS interface

pupil 3.9 mm

Page 5: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

9/13/2010

PINHOLE SOURCE, TAS OBJECTIVE

31

11

8

1

7

2

28

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

PINHOLE SOURCE, TAS COMPLETE

50x452ms EXPOSURE OF VEGA

nm

nm

152VP

17RMS

95.0Strehl

ZERNIKES [nm]

nm

nm

196VP

22RMS

92.0Strehl

6

18

24

22

25

27

15

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

TAS

nm

nm

237VP

27RMS

89.0Strehl

41

22

25

31

25

36

7

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

contours in nm

E1 9/28/2010

90

66

0

5

114

141

58

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

nm

nm

558VP

78RMS

35.0Strehl

1000 x 10ms exposures of Vega

1600 nm 2200 nm540 nm

WAVEFRONT MAP

89.0Strehl 94.0Strehl

ZERNIKES [nm]

contours in nm

CALIBRATION px

m907.9

m922.9

Page 6: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

E2 9/17/2010

nm

nm

606VP

95RMS

14.0Strehl

1000 x 10ms exposures of Vega

1600 nm 2200 nm540 nm

WAVEFRONT MAP

82.0Strehl 90.0Strehl

ZERNIKES [nm]

149

166

158

53

154

41

55

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

contours in nm

S1 9/23/2010

147

40

14

27

307

226

568

11

10

9

8

7

6

5

Z

Z

Z

Z

Z

Z

Z

nm

nm

1211VP

231RMS

02.0Strehl

1000 x 10ms exposures of Vega

1600 nm 2200 nm540 nm

WAVEFRONT MAP

26.0Strehl 52.0Strehl

ZERNIKES [nm]

contours in nm

contours in nm

Page 7: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

re-center star by tilting

the telescope

WFS :

comaZZ2

8

2

7

115 ,..., ZZ

tilt M2N

astZZ2

6

2

5

Y

tilt M1N re-center star by tilting

M2

focus

center star in WFSTWEAKING ALGORITHM

BASED ON SIMULATIONS

Y

Page 8: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

A

B

C

M2

DIAL INDICATOR

ACTUATOR

ORTHOGONAL AZ-EL ADJUSTMENT AT M2 BUT NOT AT M1

EL

AZ

SOFTWARE

Page 9: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

AST COMA TREFOIL

Z4

Z5

Z6

Z7

Z8

Z9

Z10

Z11

min1

5Z

6Z

7Z

8Z

9Z

10Z

B

A

PUPIL ROTATES WITH TIME

Page 10: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

02-03-2011 02-12-2011 W1

P-V=1340 nm

RMS=270 nm

P-V=318 nm

RMS=50 nm

1 arcsec1 arcsec

540 nm 540 nm

ASYMMETRIC PUPIL

02/03/11

[nm]

02/12/11

[nm]

540 27

570 145

-175 -41

196 -40

5Z

6Z

7Z

8Z

Page 11: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

M3

W1 2/12/11

Nikon D80 20s

Page 12: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

MONTE CARLO SIMULATION

M1 TILT M2 TILT INCIDENT BEAM

1 2

2

x

y

x y

z

)0,,( 11 vu

),,0( 222 wvu

11

2

2

SOLUTION 1 SOLUTION 2

x

z

y

TWO SOLUTIONS AT A GIVEN

M1,M2 LATERAL

DISPLACEMENT

1

Page 13: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

WFS

FUTURE PLANS:

WHAT IS THIS?

FOCUS INACCESSIBLE

TESTING M1 IN SITU

Page 14: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

CCD CAMERA

FINDING THE VERTEX OF M1

M1 is F/2.5

VERY SENSITIVE TO MISALIGNMENT

COMA

Page 15: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

SIMULATED PRIME FOCUS IMAGES

OFF-AXIS ON-AXIS

Page 16: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

COMA FREE TILTING OF M2

SPHERICAL BEARING

AT THE FOCAL POINT

M2ACTUATORS

Page 17: Telescope Alignment and Wavefront Sensing · ZERNIKES [ nm] CALIBRATION px contours in nm 9.907 m 9.922 m. CHARA Collaboration Year-Seven Science Review E2 9/17/2010 nm nm P V 606

CHARA Collaboration Year-Seven Science Review

ODDS & ENDS

• COUDE-BOX COVER

O u t[1 1 2 ]=

15604 15606 15608 15610 15612 1561410

5

0

5

10

15

20

25

JD 2440000.5

E1

OUTSIDE

Temperature C°

• HUMIDITY-TEMPERATURE

SENSORS IN THE DOMES

6h


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