Development and validation of a temperature measurement correction algorithm under intensive solar radiation conditions

Relevance. Accurate air temperature measurement is a fundamental task in vineyard microclimate monitoring, as this parameter directly affects phenological processes, pathogen development, and the formation of grape quality characteristics. Available meteorological stations possess a significant limitation — substantial systematic errors when measuring temperature under conditions of intense solar radiation. The development of methods to minimize these errors is critically important for advancing precision viticulture technologies.
Methods. The study is based on theoretical analysis and experimental validation of thermophysical processes in radiation shields. A specialized measurement setup was developed with meteorological systems: a ventilated shield with photovoltaic power supply and a non-ventilated shield, equipped with wind speed and solar radiation sensors. An original physical model of heat balance was proposed, accounting for convective heat exchange, radiative effects, and geometric characteristics of protective devices. An adaptive iterative algorithm was developed for real-time temperature correction calculations on microcontroller systems with mechanisms for handling singular states and ensuring stable convergence.
Results. It was experimentally confirmed that non-ventilated shields demonstrate systematic errors up to 3 °C under high solar radiation. Ventilated shields reduce maximum deviations to 1 °C but require regular maintenance. The developed mathematical correction algorithm outperforms both alternative solutions: maximum deviations do not exceed 0.6 °C, mean deviations are 0.2 °C, normalized root-mean-square error is 3.5%, and the Kling — Gupta criterion reaches 0.993. The proposed solution provides an optimal balance of accuracy, costeffectiveness, and reliability for creating affordable dense networks for vineyard microclimate monitoring.

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