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

Published: August 01, 2019

Author(s)

Zeeshan Ahmed, Nikolai N. Klimov, Thomas P. Purdy, Tobias K. Herman, Kevin O. Douglass, Ryan P. Fitzgerald

Abstract

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 sensitive 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 appraches hold the promise of leveraging recent advances in frequency metrology and of achieving greater mechanical and environmental stability. In recent years many groups including ours have demonstrated a suite of photonic devices that including silicon photonic devices that can not only meet but exceed the state of art in temperature metrology
Citation: SPIE Photonics West
Volume: 10923
Pub Type: Journals

Keywords

photonics, thermometry, Bragg grating, ring resonator, whispering gallery mode resonator, photonic crystal cavity
Created August 01, 2019, Updated August 20, 2019