Why we need fourier transform to obtain ir spectrum


Question 1: What is the basic operating principle of an ATR based sampling system? What are the advantages of an ATR-based sampling system compared to one based on direct transmittance of [R radiation in terms of sample thickness and preparation techniques?

Question 2: When using an FTIR, which utilizes an interferometer, why do we need a Fourier transform to obtain the actual IR spectrum?

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Physics: Why we need fourier transform to obtain ir spectrum
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