Characterisation and laboratory investigation of a new ultraviolet multi-wavelength measuring system for high-temperature applications. (June 2016)

• Record Type: Journal Article
• Authors: Battuello, M.; Girard, F.
• Is Part Of: Measurement. Volume 87(2016:Jun.)
• Page Start: 126
• Page End: 137
• Publication Date: 2016-06
• Subjects: Radiation thermometry -- Multi-wavelength -- Emissivity; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2016.03.024
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: A novel flexible UV multi-wavelength thermometer was developed and characterised. The UV operation drastically reduce the possible errors of the multi-wavelength approach. A general rule has been developed that confirms the reliability of the results. A result is not guaranteed but when obtained it is with a good level of confidence. Abstract: In the framework of the HiTeMS project of the European Metrology Research Pogramme (EMRP) a new multi-wavelength device for measurement of high temperatures in industrial applications was developed at INRIM. The apparatus takes advantage of the ultra-violet operation with working wavelengths from 350 nm up, which reduces the possible errors connected with the multi-wavelength approach. The instrument has been characterised in terms of optical and electronic behaviour and some laboratory trials were carried out to verify the reliability of the multi-wavelength approach. The true temperature of a blackbody source at 1300 °C with optical windows of unknown spectral transmittance interposed has been defined. By applying an approach that allows a result to be accepted when a threshold limit is reached, it was found that, when an acceptable result can be obtained, errors are comprised within less than 1% of the temperature of the source. Three others single-band thermometers, at 508 nm, 650 nm and an IR broadband 0.8–1.1 μm, were also used to the purpose of a comparison. It has been found that, when the multi-wavelength approach is applicable, it provides generally better or in few cases, at worst similar results of corrected single-wavelength thermometers.