Patent ID: 9557220
Date: 2017-01-31
CPC Classifications: G01J,G01N

Claim:
1. A Fourier transform spectroscopy method including a Fourier transform frequency analysis method, for observing a periodical and repetitive phenomenon, the method comprising: acquiring a temporal waveform by matching a repetition period of a phenomenon with an observation time window size T for observing a temporal waveform of a phenomenon; obtaining a discrete distribution spectrum with a frequency interval equal to a reciprocal of said observation time window size T, by a Fourier transform of an acquired time waveform; and holding the formula f wherein the temporal waveform is acquired by observing a phenomenon within a time window size shorter than said repetition period, introducing null data for the acquired temporal waveform data to be matched to the repetition period and acquiring a temporal waveform matching with the repetition period, instead of matching the repetition period of said phenomenon with said observation time window size T.