โ Scribed by V.C. Fernicola; R. Galleano
No coin nor oath required. For personal study only.
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 0-150 ยฐC. The system affords a temperature repeatability to within 0.3 ยฐC, 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.
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