Staehle Consulting, Principal, Roger W. Staehle, Ph.D., NAE
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Analytical technologies

Breadth of analytical technologies and measurement techniques available to Staehle Consulting clients

Clients of Staehle Consulting often need a diverse range of technical support from physical measurement techniques.  Such needs are often not known at the outset of the investigation and no one laboratory has the set of equipment required by Staehle’s clients.  Further, such equipment requires a high overhead.  Staehle Consulting solves these problems by subcontracting with well-established expert laboratories without a continuous need for overhead.  Also, commercial laboratories provide good schedules.  Examples of methods, which have been used by Staehle Consulting in the past and which are routinely available, are listed here.  Techniques include:

  • Scanning electron microscope (SEM) morphology of surfaces at high magnifications to 25,000X and surface chemistry. 

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  • Optical metallography (morphology to 1500X).

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  • Auger electron spectroscopy (AES), chemical composition of surface layers one layer at a time.

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  • Atom probe identifies atoms one at a time, e.g. at grain boundaries.
  • X-ray photoelectron spectroscopy (XPS), identifies atom layers several at a time on the valence of species.
  • Electron dispersive spectroscopy (EDS), determines chemistry on surfaces to about 0.1µm depth.
  • Secondary ion mass spectroscopy (SIMS), determines surface chemistry to one atom layer without interference.
  • X-ray diffraction (XRD), determines crystal structure.

 X-ray diffraction graph

  • Analytical transmission microscopy, high magnification transmission microscopy (ATEM).

 ATEM images of corrosion

  • Chemical composition of water including multiple methods (numerous methods for determining chemistry of water to about 10ptt).

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  • Hardness testing on surfaces to determine strength (Brinnell, Vickers).
  • Micro-hardness.

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  • Tensile testing including fatigue, constant extension rate, and fracture toughness (apply load in monotonic, cyclic, constant stress intensity).
  • Microbial analysis relative to MIC (measures type and concentration of microbes).
  • Electrochemical studies (measures effects of potential on current for metallic corrosion or for reaction of environmental species).

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  • High-temperature water electrochemical autoclaves as well as at room temperature in glass cells.