1. Preliminary Design Review
Katie Schwertz
Optics 523
April 3, 2009

2. Overview
Mounting an illumination lens and test plate into a single cell
Lens diameters = 16”
Material = Fused Silica
Illumination Lens
Test Plate

3. Requirements Review Test Plate Alignment of lenses Adjustment of cell
Concave surface: RMS slope error < 10 nm/cm (0.1 urad)
Alignment of lenses
100 um position
1 mrad angle
10 mm nominal separation (100 um tolerance)
Adjustment of cell
0.2 urad angular sensitivity
0.15um translation sensitivity (along axis)
Coarse and fine adjustments
Interface
Access points needed at 3 points around cell for a feeler gauge measurement
Test plate will be 5 mm away from next surface
Cell will sit within another cell on rollerballs in kinematic grooves

4. Interface
12 sets of kinematic grooves around diameter
Piezoelectric stages will drive this cell from underneath (Z-direction) to obtain fine axial adjustments required

5. Design Concept 3 counterweight supports 6 axial flexures
Mirror adjuster/micrometer
access points (3)

6. Slope analysis: 6 point flexure
RMS Slope Error = 1.35 nm/cm

7. Flexure Properties Flexure Material: CRES 17-4
Vukabratovich, pg
Flexure Material: CRES 17-4

8. Design Concept 3 counterweight supports 6 axial flexures
Mirror adjuster/micrometer
access points (3)

9. Counterweight
Vukabratovich, pg 297

10. Flexure Positioning (1)
Apply moment to each flexure attachment point
See how much slope error is imparted onto the lens with a given angle

11. Flexure Positioning (2)
Adjust angle of flexures to determine optimal angle to mount flexures

12. Action Items Finish Solidworks models of interfaces and counterweights
Determine moment tolerance
Determine optimal angle of flexures
Determine thickness/stiffness of cell needed

13. Appendix – Lens Drawings

14. Appendix – Lens Drawings