I upgraded a manual monochromator into a scanning monochromator using a small piece of aluminium, a few drilled holes, screws, a stepper motor and a shaft adapter.
The aluminium bracket holds the motor in line with the original wavelength control shaft. The shaft adapter connects the two while allowing the original monochromator mechanism to remain unchanged.
Once the number of motor steps between known wavelength positions is measured, software can repeat a scan instead of turning the control by hand.
Some photos below.
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