LNE's optical pyrometry laboratory now offers calibration of radiant sources as grey bodies with an emissivity of 0.95 under Cofrac accreditation. It is currently the only laboratory accredited by Cofrac for such a wide range of pyrometry calibrations: flat or cavity radiant sources, pyrometers, IR (infrared) thermometers and IR cameras.
Meet the needs of calibration of infrared thermometers
The extension of the scope of its Cofrac Etalonnage No. 2-02* accreditation enables LNE to connect radiant sources directly for the calibration of infrared thermometers (IR) with an emissivity setting of 0.95.
IR thermometers, filtered in the 8-14µm spectral band, are widely used for non-contact temperature control between -20°C and 500°C in all sectors of industry: automotive, railway or aeronautical transport, health, electrical safety, maintenance, air conditioning, etc... The emissivity value is set at 0.95 to correspond to the most common cases. It is then appropriate to perform their calibration against a source equivalent to a gray body of emissivity 0.95.
A method developed in the framework of research programs
LNE has therefore developed a specific procedure for calibrating these transfer sources as grey bodies with an emissivity of 0.95 using a luminance comparator and by comparison with reference black bodies. These equipments intended for the transfer of the temperature scale to the users were developed and metrologically characterized within the framework of various research programs supported by the French Metrology. They are the result of long experience in optical pyrometry (LNE has been accredited for over 30 years in pyrometry).
This method allows to reach, in the best cases and for the temperature range [-20°C-500°C], uncertainties between 0.3°C and 1.3°C (k=2). The method also allows calibrations for other emissivity values.
LNE has also updated its calibration of IR thermometers (for emissivity settings of 1 and 0.95) and is presenting improved uncertainties on the new Cofrac scope.
With the extension of its scope of accreditation, LNE is now able to meet the need for calibration of instruments in the temperature range from -20°C to 3000°C and for spectral bands between 0.65 µm and 14 µm.
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