Discussion
How does a chopper work in a double-beam instrument?
Answer: C
A rotating mirrored disc directs the beam first through the sample and then through the reference, many times a second, so one detector sees both and their ratio is formed electronically. Ambient rejection is a useful side effect of the modulation rather than the purpose, and neither slit nor detector is switched. Using one detector for both paths removes any mismatch between two detectors, which would otherwise reappear as exactly the error the arrangement exists to remove.
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