That would add a collimating lens, beamsplitter (half-reflective mirror), full-reflective mirror and another photodiode to the setup
but...if the lightsource fluctuations are reasonably faster than the sampling rate (design goal 20 Hz), then wouldn't one get the same result just by averaging/filtering those out?
I want to measure the absolute humidity in a gas stream, and i've found that water has an absorption peak at ~940-950nm
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