Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 347, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2022.113872
Keywords
Photonic thermometry; Hysteresis compensation; ARIMA; Couple-mode theory; Machine learning; Fiber Bragg gratings
Funding
- NIST-on-a-chip (NOAC) initiative
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This study systematically examines the temperature response of FBG thermometers, and finds that a dynamic regression model can effectively reduce measurement uncertainty.
In recent years there has been considerable interest in using photonic thermometers such as Fiber Bragg grating (FBG) and silicon ring resonators as an alternative technology to resistance-based legacy thermometers. Although FBG thermometers have been commercially available for decades their metrological performance remains poorly understood, hindered in part by complex behavior at elevated temperatures. In this study we systematically examine the temporal evolution of the temperature response of 14 sensors that were repeatedly cycled between 233 K and 393 K. Data exploration and modeling indicate the need to account for serial-correlation in model selection. Utilizing the coupled-mode theory treatment of FBG to guide feature selection we evaluate various calibration models. Our results indicates that a dynamic regression model can effectively reduce measurement uncertainty due to hysteresis by up to approximate to 70%.
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