Michelson interferometer很重要要會畫
high resolution - resolve vibrational and rotational bonds
kinetic study ex:step flow(fast reaction)
small simple size (因為可以平均很多次 sensitive↑)
reflection spectroscopy (干涉圖)
emission spectroscopy 不須光源 可以測外太空的東西
FT就是把time-domain→frequenct-domain)
power of signal = P(delta) interferogram