A5043051102- Calibration and Measurement Techniques
- Advanced Sensor Technologies Research
- Radiative Heat Transfer Studies
- Scientific Measurement and Uncertainty Evaluation
- Chemical Thermodynamics and Molecular Structure
- Atmospheric Ozone and Climate
- Infrared Target Detection Methodologies
- Thermal Regulation in Medicine
- Infrared Thermography in Medicine
- Spacecraft and Cryogenic Technologies
- Climate Change and Health Impacts
- Thermoregulation and physiological responses
- Photonic and Optical Devices
- Atmospheric aerosols and clouds
- Thermography and Photoacoustic Techniques
- Stroke Rehabilitation and Recovery
- Body Contouring and Surgery
- Advanced Malware Detection Techniques
- Library Science and Information Systems
- Advanced Thermodynamic Systems and Engines
- Digital Mental Health Interventions
- Non-Invasive Vital Sign Monitoring
- Cerebrovascular and Carotid Artery Diseases
- Optical Coatings and Gratings
- Particle Accelerators and Free-Electron Lasers
National Physical Laboratory
2010-2024
University of Calgary
2024
Guy's and St Thomas' NHS Foundation Trust
2022
St Thomas' Hospital
2022
Teddington Memorial Hospital
2018
The Royal Free Hospital
2004
University College London
2004
St. James's Hospital
1998
The thermodynamic temperature of the point inflection melting transition Re-C, Pt-C and Co-C eutectics has been determined to be 2747.84 ± 0.35 K, 2011.43 0.18 K 1597.39 0.13 respectively, freezing Cu 1357.80 0.08 where symbol represents 95% coverage. These results are best consensus estimates obtained from measurements made using various spectroradiometric primary thermometry techniques by nine different national metrology institutes. good agreement between institutes suggests that...
The eutectic alloys rhenium–carbon, platinum–carbon and cobalt–carbon have been proposed as reference standards for thermometry, with temperature uncertainty values specified within the mise en pratique of definition kelvin. These investigated in a collaboration eleven national measurement institutes laboratories. Published results reported point-of-inflection melting curve extremely low uncertainties. However, to be considered it is necessary stipulate what phenomenon value has ascribed to;...
The mise-en-pratique for the definition of kelvin at high temperatures will formally allow dissemination thermodynamic temperature either directly or mediated through high-temperature fixed points (HTFPs). In this paper, these two distinct methods are evaluated, namely source-based and detector-based. This was achieved by performing trials: one based on HTFPs, other absolutely calibrated radiation thermometers filter radiometers. These trials involved six national metrology institutes in...
The National Physical Laboratory (NPL) maintains a range of reference blackbody cavities its own design with apertures from 3.0 to 100 mm in diameter for use over the temperature 10-1064 degrees C. These sources are used calibration radiation thermometers and evaluation industrial wavelength 0.9-14 mu m. This paper describes their intercomparison using high-precision infrared radiometer. results showed radiance compatibility better than +or-0.6 C wide therefore validates high quality NPL as...
National Institute of Metrology, China (NIM) and Physical Laboratory, UK (NPL) blackbody cavities based on the ITS-90 freezing points In, Sn, Zn Al have been compared by radiation thermometry. The average differences between Sn Zn, measured NPL InGaAs thermometer, are 5.3, 2.2 −7.3 mK, respectively, Al, NIM 1.4, −5.8 13.7 respectively. These well within uncertainties comparison. reference sources from 156 °C to 1000 were verified using both thermometers calibrated at fixed points. radiance...
The International System of Units (SI) is to be redefined with implementation set on World Metrology Day (20th May 2019). Under the auspices Consultative Committee Thermometry (CCT) world thermometry community has been working together ensure a smooth and effective redefinition kelvin. A large part that activity coordinated through European Programme for Innovation Research: "Implementing new kelvin" projects. This paper describes InK2 project contribution.
The number of thermal imagers being used for absolute temperature measurement in industry has increased dramatically the past few years.Due to this it is vital that we have a greater understanding performance and limitations manufacturing, design calibration purposes, particular applications where they are quantitative measurements.A metrological assessment six was carried out over their full range using National Physical Laboratory (NPL) high standard blackbody reference sources identify...
The silver and copper fixed-point blackbody sources of NPL were directly compared with those LNE-Cnam using an IKE LP3 LP5 at three wavelengths (650 nm, 795 nm 903 nm). two fixed points the in excellent agreement each other, a difference 11 mK for within 16 mK copper, expanded measurement uncertainty between 10 mK 20 mK depending on pyrometer used. temperature interval freezing was also measured combinations all four points. results gave value silver–copper 122.89 °C 30 mK; 122.87 °C this...
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Above the freezing point of silver (961.78 °C), International Temperature Scale 1990 is defined in terms Planck’s radiation law. The scale maintained and disseminated using a validated linear pyrometer conjunction with blackbody reference source at either Ag, Au (1064.18 °C) or Cu (1084.62 point. In order to realize highest precision high quality, well‐characterised, reproducible fixed‐point sources are required. Such have been NPL for number years, but it was felt that improvements design...
Main text This report outlines the equipment, measurement method, results and uncertainties associated with participant measurements for Consultative Committee of Thermometry Key Comparison K10 (CCT-K10), "ITS-90 realisations above silver point using two transfer radiation thermometers a set high temperature fixed-point blackbody cells", over period from around summer 2014 to final made during January 2020. The presents differences data KCRV values both thermometer HTFP measurements. Note:...
Since the advent of reliable mercury-in-glass thermometers in latter part 19th century practice clinical thermometry was thought to be a solved issue. However with advances technology there has, recent decades, been proliferation temperature measurement methods applied medical science. Many these have introduced because benefit they confer, nevertheless, some cases metrological foundation and infrastructure ensure sound not place. This paper will focus on standardisation activity undertaken...
Radiation temperature scales were realized with a precision infrared thermometer at IMGC, NPL and UME using fixed-point blackbodies the freezing points of indium, tin, zinc, aluminium silver. From calibration in each laboratory, continuous obtained four-coefficient interpolation equation. The differences between three well within 0.1°C all temperatures indium silver points. Calibrations same performed more traditional scheme based on comparison contact thermometers showed up to than 0.4°C....
The use of infrared tympanic thermometers for monitoring patient health is widespread. However, studies into the performance these have questioned their accuracy and repeatability. To give users confidence in devices, to provide credibility measurements, it necessary them be tested using an accredited, standard blackbody source, with a calibration traceable International Temperature Scale 1990 (ITS-90). address this need National Physical Laboratory (NPL), UK, has recently set up primary ear...
Over the years, a number of international comparisons have been performed, in field radiation thermometry, to compare realisation temperature scales. These involved use transfer instrument circulated among participants and were designed different ITS-90 realisations at national measurement institutes (NMIs). EUROMET project 658 ('The examination base parameters for scale realisation') was instigated investigate uncertainties some underlying these realisations, namely: size-of-source effect,...