GOM Scanner & Photogrammetry System


The GOM scanner measures complex parts accurately down to the smallest detail.


Whittle GOM scanner

The GOM scanner uses a stereo camera set-up to measure complex parts very accurately. It projects different fringe patterns onto the object‘s surface. These patterns are recorded by the two cameras and converted into a 3D CAD file. The GOM scanner at the Whittle Lab is capable of resolving parts down to a few microns – it has been successfully used to resolve the true manufactured shape of nominally circular compressor leading edges of ~0.5mm diameter. 


GOM Scanning a turbine blade

The 3D CAD files produced by the GOM scanner can be used to simulate the actual parts tested in CFD including all the manufacture errors and “in service” effects such as erosion/ corrosion.  The GOM scanner is also used to verify the accuracy of manufacture processes so we know that the parts we’re testing are what we intended.


Results from a set of GOM scanned compressor blades (black) compared to the nominal design intent (red). Taken from Goodhand et al (2015).

More details about the GOM scanner and photogrammetry system at the Whittle Lab can be found at the links below:

The GOM scanning system at Whittle Lab 3D printer is available for use by other Cambridge Departments or external organisations.  More information and contact details can be found on the Cambridge University Equipment Sharing website.

Go to website for more info

Key facts & applications

The 3D CAD files produced by the GOM scanner are used to verify the accuracy of our parts and to simulate in CFD the actual, rather than the nominal, blades tested.

Key facts

  • 2 sensor heads available:
    • ATOS Core 80: Measurement area 60 x 80mm, Point spacing 0.03mm
    • ATOS Core 135: measurement area 135 x 100mm, point spacing 0.05mm
  • GOM Scanport: 3 axis robot for automated measurement of large batches of parts.
  • Photogrammetry system, TRITOP, for measurement of point markers. Primarily used for fixture calibration.


  • High resolution measurement of complex parts.
  • 3D CAD geometry generation of the actual part for use in simulation tools such as CFD or FEA.
  • Verification of manufacture processes and part accuracy. 

Research topics

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