PHOTONIC THERMOMETRY: UPENDING 100 YEAR-OLD PARADIGM IN TEMPERATURE METROLOGY

摘要

For the past century, industrial temperature measurements have relied on resistance measurement of a thin metal wire orthin metal film whose resistance varies with temperature. Today’s resistance thermometers can routinely measuretemperatures with uncertainties of 10 mK to 100 mK over a broad range of temperatures in varied settings ranging froma stove top to an industrial broiler to a nuclear power plant. However, for all their utility, resistance thermometers remainvulnerable to mechanical and thermal shock and attack from harsh chemicals. The resultant drift in sensor resistancenecessitates frequent off-line, expensive, and time-consuming calibrations. These fundamental limitations of resistancethermometry, born of material properties, have generated considerable interest in developing photonic temperaturesensors. Photonic appraches hold the promise of leveraging recent advances in frequency metrology and of achievinggreater mechanical and environmental robustness. In recent years many groups including ours have demonstrated a suiteof photonic devices including silicon photonic devices that can not only meet but exceed the state of art in temperaturemetrology.