Differences

This shows you the differences between two versions of the page.

--- song_spectrograph_assembly [2025/05/30 17:55] – 172.59.0.80
+++ song_spectrograph_assembly [2026/01/22 18:46] (current) – 128.123.5.235
@@ Line 63: / Line 63: @@
   * Install collimating telescope behind table.
     - install laser for collimator mirror alignment at right back corner of table
-    - adjust laser to ensure correct height and (175mm) light parallel to table. Use pentaprism to get long baseline measurement of beam height at ~2 table lengths with reflection, Laser to pentaprism on top of tube with 1-inch circular mirror at bottom, then light comes back up and back towards laser: rotate pentaprism slightly to measure height with measuring stick.
+    - adjust laser to ensure correct height and (180mm) light parallel to table. Use pentaprism to get long baseline measurement of beam height at ~2 table lengths with reflection, Laser to pentaprism on top of tube with 1-inch circular mirror at bottom, then light comes back up and back towards laser: rotate pentaprism slightly to measure height with measuring stick.
     - Align auto-collimator to provide a reference parallel to the table.
       - adjust far diagonal tip-tilt to return laser back to source
@@ Line 93: / Line 93: @@
     * position slit-lens assembly to put slit at 235mm above the table
   * Install FM1
-    * at desired height (175mm): this sets the plane of the spectrograph.
+    * at desired height (180mm): this sets the plane of the spectrograph.
     * correct tilt to ensure laser stays at same height at range of distances
     * Rotate FM1 to get desired deflection angle per table marking