Discussion
What does a split-beam instrument do differently from a chopped one?
Answer: A
A split-beam design divides the light permanently and gives each path its own detector, so both are measured at once with no moving parts. The price is that the two detectors must be matched and must stay matched. Chopping trades mechanical complexity for freedom from detector mismatch, and splitting trades the reverse - which is a clean illustration of two designs solving the same problem by moving the difficulty to different places.
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