The resolution matched throughput of a Fourier transform infrared spectrometer is τ = π/2 <i>D</i><sup>2</sup>Δ<i>v</i>/<i>v</i><sub>max</sub> (1) where <i>D</i> is the (unvignetted) beam diameter at the beamsplitter (fairly close to the interferometer mirror diameter), Δ<i>v</i> the resolution, and <i>v</i><sub>max</sub> the maximum frequency.

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