Current interests

• All aspects of humidity measurement, standards and calibration
• Humidity calibrations for industrial conditions, including non-air gases and above-atmospheric pressures
• Moisture in materials, including water-specific measurements, and calibration mechanisms

Biography

Stephanie Bell is an internationally recognised authority on humidity measurement and calibration with more than 25 years' experience in the area. She has worked on: humidity measurement techniques; primary humidity standards for various humidity quantities; trace moisture in gases; moisture content of materials; vapour flux sensing (skin water loss); water vapour pressure data and calculations; climatic chambers; and uncertainty evaluation. She chairs national and international committees on humidity; leads NPL's humidity training course; and is a frequent presenter at other humidity events and training courses. She has published more than 50 papers, reports and guides on humidity and moisture, measurement uncertainty, and related subjects. She is an ISO 17025 (UKAS) assessor, and is a Fellow of the Society of Environmental Engineers.

Selected publications

• A Guide to the Measurement of Humidity
  Published by the Institute of Measurement and Control, page 68 (1996)
  ISBN 0-904457-24-9
• Measurement Good Practice Guide No. 11 - A Beginner's Guide to Uncertainty of Measurement
  S. A. Bell
  ISSN 1368-6550
• The NPL Primary Gravimetric Hygrometer
  S. A. Bell
  Papers and Abstracts from the Third International Symposium on Humidity and Moisture 1, pages 20-27 (1998)
  ISBN 0 946 754 24 1
• The NPL Standard Humidity Generator - an analysis of uncertainty by validation of individual component performance
  M. Stevens and S. A. Bell
  Measurement Science and Technology 3, pages 943-952 (1992)
• A roadmap for humidity and moisture measurement
  S Bell, R Benyon, N Böse, M Heinonen
  TEMPMEKO 2007, Int. J. Thermophys, 29 (5), pages 1537-1543 (2008)
• Non-destructive moisture content measurement of bioabsorbable polymers used in medical implants
  P. A. Carroll, S. A. Bell, A. S. Maxwell, P. E. Tomlins
  Proceedings of TEMPMEKO & ISHM 2010, Int. J. Thermophys.
  doi: 10.1007/s10765-011-0981-3
• Humidity, pressure and temperature measurements in an interdigitated-flow PEM hydrogen fuel cell
  S. Bell, G. Hinds, M. de Podesta, M. Stevens, and J. Wilkinson
  Proceedings of TEMPMEKO & ISHM 2010, Int J Thermophys.
  doi: 10.1007/s10765-011-1095-7

Contact details

E-mail: stephanie.bell@npl.co.uk
Tel: 020 8943 6402