As part of a project aimed at identifying unsatisfactory temperature distributions within foods heated in microwave ovens, a multi-channel optical fibre temperature system based on fluorescence thermometry has been developed. The system consists of a digital fluorescence lifetime thermometer, a 12-channel optical fibre multiplexer and a set of fully dielectric optical fibre probes. A custom analog-to-digital signal processing (A–DSP) for fluorescence lifetime detection was developed and special probes, suitable for microwave oven applications, were constructed. The multi-channel thermometer was calibrated by comparison against a platinum resistance thermometer traceable to ITS-90 in the temperature range 0–150C. The system affords a temperature repeatability to within 0.3 C, with 0.5 s response time. Overall system performance and probe calibration are reported. Examples of temperature distribution measurements within food analogues heated in microwave ovens are reported, as well. 2004 Elsevier Ltd. All rights reserved.
A Multi-channel Optical Fibre Thermometer / Fernicola, Vito; Galleano, R.. - In: MEASUREMENT. - ISSN 0263-2241. - 37:(2005), pp. 1-8.
A Multi-channel Optical Fibre Thermometer
FERNICOLA, VITO;
2005
Abstract
As part of a project aimed at identifying unsatisfactory temperature distributions within foods heated in microwave ovens, a multi-channel optical fibre temperature system based on fluorescence thermometry has been developed. The system consists of a digital fluorescence lifetime thermometer, a 12-channel optical fibre multiplexer and a set of fully dielectric optical fibre probes. A custom analog-to-digital signal processing (A–DSP) for fluorescence lifetime detection was developed and special probes, suitable for microwave oven applications, were constructed. The multi-channel thermometer was calibrated by comparison against a platinum resistance thermometer traceable to ITS-90 in the temperature range 0–150C. The system affords a temperature repeatability to within 0.3 C, with 0.5 s response time. Overall system performance and probe calibration are reported. Examples of temperature distribution measurements within food analogues heated in microwave ovens are reported, as well. 2004 Elsevier Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
