Opitcal Emission Spectroscopy (OES)

By measuring the visible spectrum of a metal burning under an electric arc, this method can qualify the chemical makeup and grade of a metal under test.  This method will provide a value for light elements (lighter than Calcium) including Carbon. The test is conducted in an envelope of argon.


  • Carbon content (%) of stainless or low alloy steels.
  • Distinguish between 304/316 and 304L/316L Stainless.
  • Calculate Ferrite equivalent of steel when magnetic method fails.
  • Provide input data to Carbon Equivalency calculation.


  • Not strictly "non-destructive" - requires slight surface preparation and repair.
  • Cannot test parts smaller or thinner than a dime or in tightly confined areas.
  • Analyzer is portable but not handheld.