Long-term performance of a transfer standard pyrometer
Authors: Bussolino G.C., Righini F., Rosso A.
Autors Affiliation: CNR Istituto Metrologia \’G. Colonnetti\’, strada delle Cacce 73, 10135 Torino, Italy
Abstract: The long-term performance of the transfer standard pyrometer developed at the Istituto di Metrologia \’G. Colonnetti\’ was evaluated by: 1. (a) testing a calibration technique; 2. (b) assessing the capability to maintain the high-temperature scale in comparison with high-stability tungsten strip lamps; 3. (c) checking the absolute stability of the instrument. The calibration technique of the instrument is based on the assumption that the effective wavelength and the linearity of the transfer standard pyrometer are stable for a long time. The reference temperature signal depends on the stability of many electrooptical components and might need to be checked regularly. A monthly comparison (for a period of one year) between the transfer standard pyrometer and two sets of high-stability lamps at two wavelengths (near 650 and 900 nm) indicated that the high-temperature scale kept on the pyrometer and that kept on the lamps are equivalent within the reproducibility of the scale on the lamps (±0.3 K in the temperature range 1000-2200 K). The absolute stability of the transfer standard pyrometer (900 nm operation) under carefully controlled conditions was evaluated by repeated measurements over a period of one year at the freezing point of copper. During this time the absolute stability of the instrument was better than +/-0.1 K.
Volume: 8 (1) Pages from: 21 to: 30
KeyWords: Calibration; High temperature; Pyrometry; standardsDOI: 10.1016/0263-2241(90)90073-F