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18 LS 785 High Throughput Lens Spectrograph User Manual
Figure 2-16. X-Y Stage Adjustment
5. Take a full image while running the CCD detector in Focus mode.
6. Identify a suitable peak (for example, Neon at 837.6 nm).
7. Zoom in on the peak into a window approximately 25 pixels x 25 pixels.
8. Click on the Autoscale button at the bottom of the window so that only the brightest pixels can be seen.
9. Make sure the brightest pixel is not saturating the CCD detector. It may be necessary to adjust the
exposure time to bring the intensity below the saturation level. As a rule of thumb, do not exceed 50,000
counts while imaging in the medium analog gain setting.
10. Place the cursor on the brightest pixel of the peak.
11. Turn the micrometer on the side of the stage (see Figure 2-16) to move the fiber in the X direction. While
watching the peak intensity, move the fiber back and forth until the peak reaches maximum intensity. It
may be necessary to adjust the intensifier gain and/or exposure time once again if you exceed the 50,000
count limit. When the peak has reached maximum intensity, you are properly aligned in the X direction.
12. Turn the micrometer on the top of the stage (see Figure 2-16) to move the fiber in the Y direction. Move
the fiber up or down as required.