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What does an infrared microscope allow?

  • A.Measurement below the usual wavenumber limit
  • B.Quantitative analysis without a path length
  • C.Spectra of individual particles or inclusions
  • D.Higher spectral resolution than a bench instrument

Answer: C

Coupling the spectrometer to a microscope lets a single fibre, a contaminant particle or one layer of a laminate be measured in isolation. Spectral resolution, wavenumber range and the path length problem are unchanged. Bringing a spatial dimension to a technique that had none is what turned infrared into a forensic and failure-analysis tool, and the sample size falls to micrograms in the process.

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