M74050
1/4M IMAGING SPECTROGRAPHS
17
5.2 MICROMETER ADJUSTABLE SLIT
A micrometer adjustable slit assembly is continuously variable from fully closed to 3 mm width. A
height adjustment slide allows variation in the height from 2 to 12 mm. Benefits of the micrometer
adjustable slit are flexibility and high throughput. This type of slit is designed primarily for versatility
and convenience in changing resolution and throughput, which are related to the slit width.
Figure 8: A Micrometer Adjustable Slit
The slit width setting is read on the micrometer. A set of numbers go around the turning dial. Another
set of numbers are located on the shaft. When the zeroes in both these locations line up, the slit is
fully closed. Turning the dial clockwise advances the dial position further down on the shaft, closer
to the body of the micrometer. This opens the slit.
Use a 10x multiplier to convert the micrometer reading to the actual slit opening size. For example,
turning the dial one full revolution starting from the fully closed position will give a reading of 50 on
the micrometer. Using the multiplier, this indicates the micrometer width is set to 500 um. If unsure
of the reading, begin at the fully closed position and add up each full revolution made.
Figure 9: A Fully Closed Micrometer Adjustable Slit
The slit height is continuously adjustable. Pull the lever out for the shortest height. Push the slide
in for the tallest height setting.
The micrometer is used to make the slit
narrow or wide
The slide is used to
change the slit height