System Components 25
5. System Components
5.1 FSM Mirror Head Assembly
Envelope and Mounting Interface
The FSM head assembly conforms to both 1-inch and 25 mm on-center hole
patterns and is configured for mounting at 0° and 45° angles on a standard
optical table or breadboard. The optical axis height is 1.50” when mounted.
The FSM-300head dimensions and mechanical interface are shown in
Figure 9.
Rotation Axes
The X and Y rotation axes are shown in Figure 8. Note that X rotation is
about the X-axis. The definition of these axes should be considered in the
mechanical layout and the coordinate frame definitions in the optical layout.
The polarity of the mirror rotation complies with the “right hand rule,” i.e.,
positive voltage applied at the command input creates positive (clockwise)
rotation as viewed looking along the axis.
If an external quad cell or lateral
effect detector is used as the angle sensor, the sensor axes of the detector
must be aligned to the rotation axes of the FSM mirror head.
Figure 8: X and Y axes corresponding to FSM input commands and position outputs.
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