We report on the application of ultra-sensitive, nanophotonics-based sensors for temperature metrology. In particular, we present details on implementing an advanced laser locking technique to interrogate a nanobeam photonic crystal cavity temperature sensor. Our measurement technique allows a fully continuous, wide temperature rage sensor readout without breaking a laser lock over 280°C temperature range: from -40°C to 240°C, in real-time. We provide details on sensor design and fabrication, as well the measurement setup based on an advanced laser locking technique. Our photonic sensor interrogation approach can advance the photonics thermometry towards field-deployable measurement solutions.
For the past century, industrial temperature measurements have relied on resistance measurement of a thin metal wire or thin metal film whose resistance varies with temperature. Today’s resistance thermometers can routinely measure temperatures with uncertainties of 10 mK to 100 mK over a broad range of temperatures in varied settings ranging from a stove top to an industrial broiler to a nuclear power plant. However, for all their utility, resistance thermometers remain vulnerable to mechanical and thermal shock and attack from harsh chemicals. The resultant drift in sensor resistance necessitates frequent off-line, expensive, and time-consuming calibrations. These fundamental limitations of resistance thermometry, born of material properties, have generated considerable interest in developing photonic temperature sensors. Photonic approaches hold the promise of leveraging recent advances in frequency metrology and of achieving greater mechanical and environmental robustness. In recent years many groups including ours have demonstrated a suite of photonic devices including silicon photonic devices that can not only meet but exceed the state of art in temperature metrology
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