Current interests

Dr Triantafillos Koukoulas has research interests in the application of optical methods for metrological applications. His work concentrates on the research into future primary standards for acoustical metrology, in particular photon correlation spectroscopy for the calibration of microphones, heterodyne interferometry for the calibration of underwater hydrophones and homodyne interferometry for the calibration of medical hydrophones; his interests also include acousto-optic tomography for field characterisation. He is also working on the optical characterisation of polymeric nanocomposites, in particular their dispersion profile assessment, using non-destructive techniques such as wavefront correlation, oscillatory spectroscopy and optical coherence tomography.

Biography

Triantafillos obtained his BEng (Hons) in 1997 in electronic, communication and computer engineering from the University of Bradford; his MSc in 1998 in digital electronics and parallel processing systems from the University of Brighton and the University of Sussex; and his DPhil in 2003 for his work on hybrid optical/digital correlators for pattern recognition from the University of Sussex. He joined NPL in 2006 and since then has been working on research projects for optical methods applicable to acoustic and materials metrology. He has published over 30 papers, is a reviewer for a number of scientific journals and is also a member of the Institute of Physics.

Selected publications

• Particle velocity measurements using photon correlation spectroscopy for the direct realisation of the sound pressure unit in airborne acoustics
  T. Koukoulas, P. Theobald, S. Rajagopal, B. Piper, S. Robinson and R. Barham
  Proc. 19^th International Congress on Sound and Vibration ICSV (2012)
• Particle velocity measurements using heterodyne interferometry and Doppler shift demodulation for absolute calibration of hydrophones
  T. Koukoulas, P. Theobald, S. Robinson, G. Hayman and B. Moss
  Proc. 11^th European Conference on Underwater Acoustics ECUA (2012)
• Novel non-contact optical characterisation methods of polymeric nanocomposite structures based on their particle loading and dispersion profile
  T. Koukoulas, W.R. Broughton, M. Tedaldi and P.D. Theobald
  Proc. SPIE - Int. Soc. Opt. Eng., 8082, (2011)
• Characterization of solid complex multiphase systems based on oscillatory photon correlation spectroscopy
  T. Koukoulas, W. R. Broughton, P.D. Theobald and M. Tedaldi
  Opt. Lett. Vol. 35 (22), pp 3754-3756 (2010)
• Measurement and imaging of high-frequency sonar fields using acousto-optic tomography
  P. Theobald, S. Robinson, T. Koukoulas, and G. Hayman
  J. Acoust. Soc. Am. 125, 2555 (2009)
• Towards a future primary method for microphone calibration: optical measurement of acoustic velocity in low seeding conditions
  T. Koukoulas, P. Theobald, T. Schlicke and R. Barham
  Opt. and Las. In Eng., 46, pp. 791-796 (2008)
• Utilization of carbon nanofibers for airborne ultrasonic acoustic field detection using heterodyne interferometry
  T. Koukoulas, P.D. Theobald, B. Zeqiri, I.Y. Bu and W.I. Milne
  Opt. Lett., Vol. 33 (9), pp 947 - 949 (2008)

Contact details

E: triantafillos.koukoulas@npl.co.uk
T: 020 8943 6316