National Physical Laboratory

Stephen Brown


Stephen Brown

Stephen Brown, who has a BSc in Physics, started his career at NPL in 1980. Initially in the area of Force, Stephen was responsible for the calibration of force transducers and was involved in the design of load cells using finite element analysis. After four years, Stephen was seconded to the Pressure section to rewrite their calibration software for piston cylinder assemblies using X-float techniques. Transferred to the Form and Deformation section in 1985, Stephen was involved in the measurement of structures using photogrammetry and Moiré techniques, and the calibration of length measurement interferometers. In 1993, Stephen was seconded to BAe in Saudi Arabia as a senior metrologist to run their mechanical metrology laboratory. In 1996 Stephen returned to NPL's Mass section, where he took over the responsibility of looking after the UK's kilogram standard (No 18) and the automation of their calibration service. In 2002, Stephen was incorporated into a new section for measurements of 1 and 2 dimensional length measurements using optical techniques. In 2008, NPL's National Freeform Centre was initiated, where he was responsible for the design and implementation of artefacts that could be used to verify 3D dimensional measurements generated by optical systems, such as fringe projection and articulating arms. Since 2013, Stephen has been involved in XCT as a method for traceable engineering measurements, the verification of AM parts and the qualification of composite materials.


  • Characterisation of a scintillation flat panel detector employed by an X-ray computed tomography system: measurements of MTF, NPS and DQE, Sun W, Konstantinidis A, Billas I, McCarthy M, Brown S, Corcoran H, Proceedings of 16th euspen International Conference, Nottingham, UK, 2016
  • Characterisation of X-ray source for X-ray computed tomography for dimensional metrology
    Corcoran H, Sun W, Brown S, Robson S, Speller R, McCarthy M, International Conference on Industrial Computed Tomography, Wels, Austria,
  • Investigation of the focal spot drift in industrial cone-beam X-ray computed tomography, Flay N, Sun W, Brown S B, Leach R K, Blumensath T, The e-Journal of Nondestructive Testing, 20, 9 (2015)
  • A preliminary study of characteristics of X-ray computed tomography, Sun W, Flay N, Brown S, McCarthy M, Corcoran H, Ferrucci M, Proceedings of Digital Industrial Radiology and Computed Tomography, Ghent, Belgium (2015)
  • A new method of performance verification for x-ray computed tomography measurements, Leonard F, Brown S, Withers P, Mummery P, McCarthy M, Measurement Science and Technology, 25 (2014)
  • An overview of industrial x-ray computed tomography, Sun W, Brown S B, Leach R K
    NPL Report ENG 32 (2012)
  • Observations on the performance of X-ray computed tomography for dimensional metrology. ISPRS, Corcoran, H. C., Brown, S. B., Robson, S., Speller, R. D. and McCarthy, M. B., International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLI-B5, 25-31. doi:10.5194/isprs-archives-XLI-B5-25-2016

Contact details

Tel: 020 8943 6979

Last Updated: 6 Oct 2016
Created: 6 Oct 2016


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