Guomin Wang

1
Chinese SONG progress and its design
introduction

• Guomin Wang
• gmwang_at_niaot.ac.cn
• 2011-9-16
• Nanjing Institute of Astronomical Optics
  Technology

SONG 4th Workshop
College of Charleston
2
Outline

• Progress introduction
• Telescope design introduction

3
PROGRESS INTRODUCTION
4
August 13, 2010 Finished the PDR
5
December 25, 2010 Finished the CDR
6
Now, we are
Structure constructing
7
Now, we are
Mirrors material test report from Russia LZOS
Preparing
mirror fabrication
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Large bearing manufacturing
Delivery time 4 months
Azimuth bearing f680 f880 80
9
Large bearing manufacturing
Delivery time 4 months
Altitude bearing f240 f320 38
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Preparing contract for long-term elements, such
as . . .
Encoders
Torque motors
11
Telescope schedule
Item Schedule Status
Preliminary Design Review Aug., 2010 Closed
Critical Design Review Dec., 2010 Closed
Factory Acceptance Nov., 2012 On going
Ready for Shipment Dec.,2012 . . .
On site Acceptance Apr., 2013 . . .
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TELESCOPE DESIGN INTRODUCTION
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General requirements

• Cassegrain system
• M1 paraboloid, 1m clear aperture, Zeodur
  material, active support and close-loop
  controled through S-H
• M2 hyperboloid, fused silica material, active
  positioned by 5-DOF unit
• M3 flat mirror, Zeodur material, 180turn to
  direct the light to different Nasmyth platform
• System ratio F/36.7

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General requirements

• Image quality 80 energy encircled in 0.3? _at_
  lucky imaging focus
• Nasmyth focus VIS camera (450 - 650nm), RED
  camera (650 - 1000nm), Focus monitoring camera (lt
  450nm), auxiliary focus
• FOV _at_ Nasmyth R32.52?
• Coudé focus spectrograph (480 - 680nm)
• FOV _at_ Coudé 10?
• ADC doublet prism
• Optical derotator three - mirror

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General requirements

• Range of azimuth 0 º 220º
• Range of altitude 10 º 89º
• Max. acceleration 2 º/sec2
• Max. pointing speed 20 º/sec
• Blind spot 2 º (diameter)
• Tracking accuracy RMS 0.3? , 90s, no guiding
• Pointing accuracy RMS 5?, 70 º ZD 1 º
• Repeat pointing accuracy RMS 1?, 70 º ZD
  1 º
• First frequency large than 8 Hz

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General view
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F/36.7 layout
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F/36.7 parameters
Item Parameters
M1 ?1000
Primary ratio F2.3
System ratio F36.667
Primary focus length 2300
System focus length 36666.8(?546.1nm)
FOV R32.52?
M1-M2 distance 2100 mm
M2M3 distance 1600 mm
M3focus distance 1588.3 mm
Working wavelength VIS(?450650nm) RED(?6501000nm)
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F/36.7 imaging quality after ADC
Spot diagram of VIS _at_ ZD 5
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F/36.7 imaging quality after ADC
Spot diagram of VIS _at_ ZD 45
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F/36.7 imaging quality after ADC
Spot diagram of VIS _at_ ZD 75
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F/36.7 imaging quality after ADC
Spot diagram of RED _at_ ZD 5
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F/36.7 imaging quality after ADC
Spot diagram of RED _at_ ZD 45
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F/36.7 imaging quality after ADC
Spot diagram of RED _at_ ZD 75
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Nasmyth optical design
To Coudé
From telescope
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Nasmyth structure
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Coudé optical design
From telescope
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Coudé structure
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Optical elements list
Item Size(mm) Material Coating Accuracy Qty.
M1 f1030x75 Zeodur AL ?/50 1
M2 f96x25 Fused silica AL ?/60 1
M3 f76X15 Zeodur AL ?/60 1
M4 f30x5 Zeodur AL ?/60 3
M5 f54x8 AL Zeodur ?/60 5
Wedge prism f40x6,?5 H-LAK10/H-ZF1 450-1000nm antireflection ?/60 2
K mirror 1 60x44x10 Zeodur AL ?/60 2
K mirror 2 36x30x8 Zeodur AL ?/60 1
Dichroic mirror 1 f30x3 Fused silica 450-620nm (R) 680-1000nm (T) ?/30 1
Dichroic mirror 2 f30x3 Fused silica 450-620nm Half-reflection ?/30 1
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Item Size(mm) Coating Material Accuracy Qty.
Field lens 1 f20x4 Antireflective H-K9L N1, ?N0.1 1
Field lens 2 f20x5 Antireflective H-K9L N1, ?N0.1 1
Achromatic lense1 f20x7.5 Antireflective H-K9L/H-ZF2 N1, ?N0.2 1
Achromatic lense2 f20x7.2 Antireflective H-K9L/H-ZF2 N1, ?N0.2 1
Achromatic lense3 f38x7.5 Antireflective H-K9L/H-ZF2 N1, ?N0.2 1
Achromatic lense4 f22x7 Antireflective H-K9L/H-ZF2 N1, ?N0.2 1
Achromatic lense5 f24x9 Antireflective H-K9L/H-ZF2 N1, ?N0.2 1
Achromatic lense6 f22x7.2 Antireflective H-K9L/H-ZF2 N1, ?N0.2 2
Protect mirror f54x8 Antireflective Fused silica ?/10 3
Dichroic prism 32x32x32 Antireflective Fused silica ?/1010? 1
Dichroic mirror 4 f32x3 Half-reflective Fused silica ?/10 1
Tilt mirror f32x5 Al 480-680nm Zeodur ?/20 1
Filter f22x3 480-680nm Fused silica ?/10 3
31

• Constrained the 8 fixed anchor bolts
• Applied 3.5 t on the bearing place to simulate
  the above weight
• Apply 1g on the structure
• Apply 700N on the place of 1373mm from the
  bearing to simulate the wind force at 15 m/s

Basement Structure
Max. stress 49.92 Mpa
Max. deformation 0.022 mm
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Table 2-1 Parameeters of iron pad
Levelness adjustment
Rated load (N) Max. load (N) Unit torque (Nm/104N) Adjustable height of adjusting bolt (mm) Adjustable height (mm) Unit weight (kg)
20000 60000 2.5 0.25 5 7
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Azimuth bearing
Type Crossed roller bearing
d 680 mm
D 880 mm
H 80 mm
Axial runout lt 0.02 mm
Radial runout lt 0.02 mm
Axial sitffness 5000 N/m
Radial stiffness 10000 N/m
Tilt stiffness 450000 Nm/mrad
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Azimuth encoder
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Azimuth motor

• Friction torque 67.5N.m
• Inertial torque 50N.m
• Wind torque 139N.m

Swiss Etel Company TMB0450-100 Rated torque
561Nm Rated current 11.3A
36

• Constrain nodes connecting to bearing
• Add 1180N on top surface of center section to
  simulate the above weight
• Add 5390N on the down surface to simulate the
  down weight
• Add 1g to the structure
• Apply 400N at the place of 149.5mm above center
  section to simulate the wind force

Max. stress 12.64 Mpa
37
M1 support

• ?1010mm, thickness 45mm, center hole 65mm, flat
  bottom
• Axial supporting
• Fixed supporting 3
• Pneumatic active supporting 33 (6918)
• Lateral supporting 10 counterweight level

R1 151.72mm, F1 28.664N R2 296.5mm,
F231.183N R3 449.12mm, F336.775N
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Mirror cell calculation
Max. stress 2.9 MPa
Max. deformation 0.58 um
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Force actuatorDiaphragm Air Cylinder(Bellofram)
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Electro- pneumatic regulator
SMC Regulator
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Force sensor
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M2 positioning unit
?x (?Y) 7 µm
?Z 3µm
??x(??x) 20?
43
? uy(um) uz(um) Rotx(?)
0 0.00 11.71 0.00
10 1.52 11.57 0.14
20 2.79 11.15 0.27
30 3.80 10.44 0.39
40 4.56 9.44 0.50
50 5.10 8.13 0.58
60 5.46 6.51 0.65
70 5.68 4.59 0.70
80 5.79 2.41 0.73
90 5.83 0.00 0.74
M1-M2 offset calculation
Uz-altitute angle
Uy-altitute angle
Rotx-altitute angle
44
Frequency calculation
Mode Frequency (Hz) Mode shape
1 24.8 Fork lateral
2 26.8 Fork fore-and-aft
3 46.4 Truss lateral
4 52.2 Truss fore-and-aft
5 54.5 Top ring torsion
6 73.7 Center section
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Control architecture
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TCS configuration

• Master Computer (Advantech Industrial PC)
• Slave Computer(UMAC)

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M2 control configuration
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Communication
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3-D Of SONG telescope
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• THANK YOU !!!