Download D. Kampf

PACS IIDR
01/02 Mar 2001
FPFPU Alignment
D. Kampf
KAYSER-THREDE
FPFPU Alignment
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PACS IIDR
01/02 Mar 2001
Subsystem declaration
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•
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•
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Top Optics
Photometer
Slicer
Collimator
Spectrometer
FPFPU Alignment
common entrance optics
red and blue bolometer arrays
slicer and slicer optics
collimator mirrors and grating
red and blue spectrometer arrays
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PACS IIDR
01/02 Mar 2001
Mechanical Subsystems
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•
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Top Optics
Photometer support, mounted to top optics
Bolometer, fixed to bolometer support
Collimator, contains collimator, grating, slicer and
slicer optics, fixed to top optics and spectrometer
• Spectrometer, base plate for spectrometer detectors,
spectrometer optics and top optics
FPFPU Alignment
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Top Optics
•10 mirrors (4 flat)
•real field stop to
real field stop
•real pupil as
aperture stop
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Top Optics
•Optomechanical layout
•entrance compartment up to
aperture stop
•exit compartment up to
intermediate focal plane
•entrance and exit layers are
on different mechanical layer
•no direct straylight path
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Photometer
•Red and blue bolometer
•common Field Mirror
•Dichroic for beam splitting
•7 mirrors (2 flat)
•pupil stop in front of each
bolometer array
FPFPU Alignment
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Photometer
FPFPU Alignment
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Slicer
• to slicer optics (4
mirrors)
•slicer (3*5 mirrors)
•Field mirrors are
entrance to collimator
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Collimator
•2 collimator mirrors
•1 grating
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Spectrometer
•Red and blue spectrometer
channel
•dichroic for channel splitting
•exit of collimator between
periscope 1 & 2
•7 mirrors (3 flat)
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Alignment Task
SUBUNIT
ALIGNMENT TASK
Telescope focal plane (point source)->
Top optics
aperture stop (autocollimation) ->
chopper (autocollimation)->
common focal
spectrometer
plane
of
bolometer
and
Common focal plane (point source)->
Photometer optics
dichroic_b ->
photometer pupil (filter) ->
focal planes (red & blue)
Slicer optics
Common focal plane (point source)->
slicer entrance (focus)
Slicer
Slicer entrance (focus, point source) ->
collimator entrance (focus)
Collimator entrance (focus, point source) ->
Collimator
grating (pupil, autocollimation) ->
collimator exit (focus)
Spectrometer optics
Spectrometer
source) ->
entrance
(focus,
point
dichroic_s ->
spectrometer pupil (filter) ->
FPFPU Alignment
focal planes (red & blue)
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Top optics alignment
Collimated laser at centre of telescope secondary
FPFPU Alignment
Masks on TROG 1 -3 and FOLD 1
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Top optics alignment
Scatter plate at aperture stop together with CCD for FOLD 1 alignment ( 4 point
sources at the edge of the telescope secondary)
FPFPU Alignment
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Top optics alignment
Point source array at chopper location and scatter plates with CCD at telescope secondary
mirror edge position (alignment of FOLD 2 and FOLD 3)
FPFPU Alignment
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Top optics alignment
Point sources at focal plane of top optics. Mask at photometers Field mirror for pupil
alignment. Alignment of FOLD 4 and FOLD 5 using scatter plates at secondary mirror
FPFPU Alignment
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Photometer alignment
Centering of
photometer mirrors
using laser beam
with predefined
path from top optics
focal plane and field
mirror centre.
Position of pupils at
the bolometer
entrance is
predefined
(mechanically)
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Photometer alignment
Point sources at the focal plane
of the top optics.
Check pupil between Dichroic and
PERI 1, also at pupil to bolometer
array
Red channel alignment without
dichroic
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Slicer optics alignment
Focus to focus alignment with real pupil between IMAGE 1 and IMAGE 2.
Point source array at nominal focalplane of Top optics for realization. Scatter plate at
slicer entrance
FPFPU Alignment
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Slicer optics alignment
Slicer mirror stacks are prealigned before slicer alignment (laser at translation and rotary
stage)
Focus to focus alignment with pupil at SLICER REIMAGE
FPFPU Alignment
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Collimator alignment
Collimator alignment by means of autocollimation mirror at the grating position
Focus to focus alignment. Point source slit arrangement to scatter plate at nominal focus
of collimator (with CCD visualisation)
Grating alignment by means of rotation and measuring the high orders reflected light in
the collimators focal plane (always at the same position, otherwise alignment of the
grating)
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Spectrometer alignment
Focus to focus alignment with two stages (intermediate scatter plate between MIRROR 2 & 3)
Scatter plate at the detector position, point sources at the nominal focal plane
FPFPU Alignment
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FPU Alignment to Telescope
Optical Parameter
Primary mirror:
radius of curvature:
conic constant
3500 mm
-1.001
Vertex Primary to vertex secondary:
1587.97 mm
Secondary mirror:
Radius of curvature
Conic constant
345.26 mm
-1.292180
Diameter
308.32 mm
Distance vertex of secondary to focal plane: 2637.97 mm
Distance focal plane to OB (on axis)
202 mm
FPFPU FOV
0.13569915 deg - 0.18595779 deg.
+/- 0.03216578 deg.
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Optical Tolerances
Toleranced mirrors for the blue photometer
•
Optimized system
realigned focal position: 8 mm
FPFPU Alignment
distorted with random deviations
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Optical Tolerances
–
spherical and toroidal mirrors
radius:
tilt:
–
off axis aspheres and toroids
radius:
cc
tilt:
–
–
decenter and tilt tolerances appear in combination and will be readjusted.
The alignment procedure will contain a complete tolerancing for each mirror
installed. Flat mirrors are not taken into account as they will be used for axis
realignment.
No showstopper could be identified.
–
FPFPU Alignment
+/- 1 %
+/- 0.1 deg.
decenter: +/- 1 mm
axial shift:+/- 1 mm
+/- 0.5%
+/- 5%
+/- 0.05 deg.
decenter: +/- 0.5 mm
axial shift:+/- 0.7 mm
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FPU Alignment to Telescope
Alignment mirror location (+/- 0.5 mm for feet location and +/- 1 mm for
alignment mirrors)
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AKF position for FPU alignment at Optical Bench (+/- 1 mm or +/- 2 arcmin)
Combined error for position (+/- 2.5 mm) and measurement (+/- 1.5 mm)
delta = 5 arcmin (maximum)
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PACS IIDR
OGSE
01/02 Mar 2001
OGSE
For alignment purpose following OGSE will be used:
1. 4 x CCD array with optics
2. PC with framegrabber
3. 2 x alignment telescope
4. 4 x HeNe Laser (laser diode)
5. Set of pinholes from nickel with LED's (point sources)
6. Support structure for pinholes
7. Masks for mirrors (plexiglas with 3 point orientation to the front surface)
8. Scatter-plates
9. Lateral translation stages
10. 2 x Rotary table
11. Alignment mirrors during alignment (temporary)
Alignment mirrors for FPFPU alignment
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