A temperature reference system for calibrating fluorescence-based sensors was developed. The system is based on a special thermostatic chamber and on an electro-optic system equipped with a fiber-optic scanner. A thin layer of the sensing material to be calibrated can be coated onto a temperature controlled reference surface, which is housed inside the thermostatic chamber. It was designed in such a way as to operate under different conditions (from vacuum to atmospheric pressure) in order to evaluate the effect of the surrounding fluid on the surface temperature measurements. The reference surface can be heated both radially, by a wire wound heater, and axially, by a thermoelectric cooler. Experimental investigations were carried out in the temperature range –50 °C to about 200 °C. The results showed a temperature stability of better than 0.03 °C and a surface temperature uniformity to within 0.02 °C. The system was used to characterize a sensitive phosphor. The phosphor calibration curve was thus obtained, with a single-point repeatability of better than 0.1 °C. The spatial temperature uniformity of the phosphor-coated surface was also investigated by using the built-in fiber-optic scanner in both environments. The results showed a temperature uniformity to within 0.1 °C.
A Calibration System for Fluorescence Thermography / Rosso, Lucia; Fernicola, Vito; Tiziani, A.. - 7:(2003), pp. 1045-1050. (Intervento presentato al convegno 8th International Temperature Symposium tenutosi a Chicago, USA).
A Calibration System for Fluorescence Thermography
ROSSO, LUCIA;FERNICOLA, VITO;
2003
Abstract
A temperature reference system for calibrating fluorescence-based sensors was developed. The system is based on a special thermostatic chamber and on an electro-optic system equipped with a fiber-optic scanner. A thin layer of the sensing material to be calibrated can be coated onto a temperature controlled reference surface, which is housed inside the thermostatic chamber. It was designed in such a way as to operate under different conditions (from vacuum to atmospheric pressure) in order to evaluate the effect of the surrounding fluid on the surface temperature measurements. The reference surface can be heated both radially, by a wire wound heater, and axially, by a thermoelectric cooler. Experimental investigations were carried out in the temperature range –50 °C to about 200 °C. The results showed a temperature stability of better than 0.03 °C and a surface temperature uniformity to within 0.02 °C. The system was used to characterize a sensitive phosphor. The phosphor calibration curve was thus obtained, with a single-point repeatability of better than 0.1 °C. The spatial temperature uniformity of the phosphor-coated surface was also investigated by using the built-in fiber-optic scanner in both environments. The results showed a temperature uniformity to within 0.1 °C.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
