Jonathan Pearce is a principal research scientist leading the contact thermometry technical area of the NPL Temperature Group. He joined NPL in 2006. He has worked as a physicist in the USA, France, Japan, and the UK, and has published about 130 papers on measurement issues. Research highlights include the development of new thermocouples and high temperature fixed points for contact thermometry, and modelling of the effect of sub-ppm impurities on the solidification of high purity metals for application to primary fixed points used as temperature standards. Jonathan's main interests are developing fit-for-purpose measurement systems, developing numerical and analytical models of physical systems, and providing robust, practical contact thermometry solutions. He currently represents the UK on two CCT working groups, concerned with uncertainties and dissemination of the SI kelvin, and is the UK representative on the EURAMET Technical Committee for Thermometry (TC-T). He is a Fellow of the Institute of Physics.
Areas of interest
- Developing contact thermometry methods (thermocouples and resistance thermometers) to underpin UK standards and traceability in temperature measurement
- Analytical and numerical modelling of physical systems
- Solving real-world measurement problems in industry, government and academia
- Temperature measurement in harsh environments
Current industrially-oriented research includes development of new and improved temperature measurement techniques applied to a suite of high value manufacturing applications in aerospace, automotive, and government, in particular through coordinating a series of large European projects to enhance process control through improved temperature measurement, called EMPRESS. Key developments include both conventional devices such as thermocouples for extreme environments, as well as novel, primary thermometers such as a practical Johnson noise thermometer being developed with commercial partners. SI-oriented research includes modelling of solidification of very pure metals, development of miniature phase-change cells for in-situ calibration, characterisation of self-heating of resistance thermometers, and combinatorial calibration techniques.