CAPTEUR DE SURVEILLANCE GÉOCHIMIQUE DES GAZ DOUBLE UTILISANT UNE MÉTHODE DE REJET DES PERTURBATIONS DE TEMPÉRATURE ACTIVE
DOI :
https://doi.org/10.59277/RRST-EE.2026.2.24Mots-clés :
Mesure simultanée de deux gaz, Applications géochimiques, Contrôle actif du rejet des perturbations, Régulation de la température, Amélioration de la stabilitéRésumé
Une méthode active de rejet des perturbations thermiques a été développée pour pallier les incertitudes liées aux variations de température et améliorer la stabilité des mesures de gaz sur le terrain. Une stratégie de conduction thermique par convection symétrique a été utilisée pour assurer un chauffage uniforme de la cellule multipassage (MPC). Un contrôle actif du rejet des perturbations (ADRC) a été adopté pour compenser la perturbation thermique non linéaire et incertaine. La fluctuation de température est inférieure à 0,01 °C à l'état stable lors des expériences sur le terrain, lorsque la température est maintenue à 30 °C. La fluctuation maximale de la température lors du remplacement des échantillons de gaz est inférieure à 0,015 °C. Les concentrations de CO₂ et de CH₄ mesurées se situent respectivement entre 2100 et 3864 ppmv et entre 99 et 104 ppmv. Cette méthode de contrôle de la température garantit la fiabilité de la surveillance des gaz sur le terrain.
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