Today is a rather cold and rainy one, a rather nice change from the 90 deg+ weather we’ve been having as of late. But, a good day for a bit of bench fun.
I’m finally moving beyond the world of cardboard mockups into target enclosure territory. I managed a few more solar test spectra before winding down the preliminary design:
Sodium Double D line region
2nd Sodium Double D line region
With these results in place I feel pretty good about finalizing this design and begin the effort of placing the necessary components in a final configuration.
Below shows the configuration for assuring the slit is in the collimator’s focus. This uses a finder scope (partially pictured on the right), focused at infinity to observe the entrance slit. By moving the collimation lens the in-focus spot is obtained. The small drilled hole is then plugged that allows this calibration step.