The best replacement for ftir is ir.

The best alternatives to ftir are rated as following:
★★★★★  ir
★★★★  nir
★★★★  raman
★★★  dispersive ir
★★  atr
★★  edx
★  raman spectroscopy
★  hplc
  ndir
  dispersive
  sem
  gcms
  raman spectrometer
  gas chromatography

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Speaking about ftir, one probably shouldn't forget about atr.

Other search terms related to ftir and their ratings are:
★★★★★ atr
raman
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Google Trends

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