Chirped fourier spectroscopy. 1:dynamic range improvement and phase correction.
Chirping is the deliberate dispersion of the frequencies in a signal to remove a strong central peak. In a Fourier spectrometer, chirping improves dynamic range. For typical applications, the improvement is equivalent to about 16 dB in SNR. A very large nonlinear phase correction is required, but this is shown to be surprisingly simple to achieve in practice.
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