Spectral and Total Emissivity Measurement Services at Near Ambient Temperatures

The National Physical Laboratory in The UK offers a spectral emissivity measurment service (downloadable brochure – PDF 284kb) through its Infrared Optical Spectroscopy group to measure the spectral emissivity as needed by customers.

They also offer related calibration measurement services on their webpage as stated below:

“Optical Properties of Materials Measurement Service offers calibrations in the areas of Spectrophotmetry (reflectance and transmittance measurements, colorimetry, measurement of appearance) and Infrared Spectrometric Measurements (reflectance and transmittance measurement)”

On another webpage they repeat much of what’s in the downloadable document above and provide both equations and an informative sketch to illustrate the various measurement parameters involved.

Additionally, they provide a list of related reference documents that support the technologies involved in the services. These are quoted below:

“CLARKE, F.J.J. Measurement of the radiometric properties of materials for building and aerospace applications. Proc. Soc. Photo-Opt. Instrum. Eng., 1980, 234, 40-47.

CLARKE, F J J, and LARKIN, J A. Measurement of total reflectance, transmittance and emissivity over the thermal IR spectrum. Infrared Physics, 1985, 25, 359-367.

CLARKE, F J J, and LARKIN, J A. Emissivity determined from hemispherical reflectance and transmittance throughout the thermal infrared spectrum. High Temp. – High Press., 1985, 17, 89-96.

CLARKE, F J J and LARKIN, J A. Improved techniques for the NPL hemispherical reflectometer. Proc. Soc. Photo-Opt. Instrum. Eng., 1988, 917, 7-14.”