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Summary of Contents for PlaneWave CDK
- Page 1 PlaneWave CDK Collimation Instructions V112907...
- Page 2 Figure 1: The optical layout of the CDK system. The system contains 4 elements which consist of the primary mirror, the secondary mirror and a 2 element lens group.
- Page 3 Figure 3: On the left is the 2” adapter for the CDK12.5 attached to the Secondary Spacer and the Ronchi Ocular. On the right is the 2” adapter for the CDK20 attached to the Secondary Spacer and the Ronchi Ocular. Step 1, Rough Collimation: Put the Secondary Spacer into the 2”...
- Page 4 Figure 5: This is an example of an approximately collimated defocused star. There are three collimating screws on the CDK20 and they are ¼-20 socket head cap screws that require a 3/16 Allen wrench shown in figure 6. The CDK12.5 has four knobs that can be adjusted by hand shown in figure 7.
- Page 5 Figure 7: The CDK12.5 collimation screws and the central secondary spacing bolt. Step 2, Setting the Primary to Secondary Spacing: For your CDK optical system to perform as well as it should, the spacing between the primary mirror and secondary mirror should be set to an accuracy of +/- 1mm! Fortunately, you won’t have to measure this spacing.
- Page 6 Adjusting the Secondary Spacing on the CDK12.5 The CDK12.5 secondary mirror is not spring loaded so you must always keep tension in the collimating screws and the central bolt. To move the secondary toward the primary mirror: 1. Loosen the four collimation knobs. Loosen them in equal amounts to maintain your collimation.
- Page 7 secondary spacing is off by about 2mm. Remember you want better than 1mm spacing accuracy for the CDK12.5. Adjusting the Secondary Spacing on the CDK20 Since the CDK20 secondary mirror is spring loaded, small adjustments in spacing can be made by tightening or loosening the collimating screws by equal amounts. For large spacing adjustments, one may need to adjust the center knob shown in figure 6.
- Page 8 Figure 8: The left image is a simulation of what a null looks like through a Ronchi screen. The right image is a simulation of what an out of focus view looks like through a Ronchi screen. The right image shows 2 full lines.
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