National Physical Laboratory

Temperature & Humidity Research

Our experienced team provides world-leading research into the development of innovative sensors, standards and measurement solutions, maintains ITS-90 and delivers calibrations against UK National Standards.
  • Self-validating thermocouples are designed specifically to allow in-situ validation, where removal of the thermocouple is impractical and the exposed temperature is or can be cycled through a fixed point phase transition. Working prototypes are in use and development of industrially-applicable pieces is ongoing.
  • NPL carries out research into standards, calibration and measurement methods for humidity and related properties.
  • NPL has facilities for measurement of moisture content in a variety of materials and sample types. Services offered include measurements, research studies, training, consultancies and instrument assessments.
  • NPL is making fixed-points based on metal-carbon eutectic alloys that can provide reference points with a certified uncertainty of 0.05% of the ITS-90 temperature. NPL is coordinating a global research programme to introduce these reference standards for better temperature and optical radiation measurements.
  • Practical Acoustic Thermometry is a novel technique for measuring the temperature, particularly suited to measurements in harsh conditions at high temperatures.
  • NPL is embarking on a project to use primary acoustic gas thermometry to measure thermodynamic temperature in the range from – 40 °C to + 156 °C. This will provide new knowledge about the thermodynamic accuracy of the ITS-90, and in the longer term it will provide NPL with a capability for the direct dissemination of thermodynamic temperature over a wider range.
  • Metal-carbon eutectic alloy fixed-points constructed at NPL provide temperature reference standards up to 2500 °C for radiation thermometry.
  • NPL's research into infrared (IR) thermal imaging camera measurement, its development and application.

Registration

Please note that the information will not be divulged to third parties, or used without your permission

Login