DUAL GEOCHEMICAL GAS MONITORING SENSOR USING ACTIVE TEMPERATURE DISTURBANCE REJECTION METHOD
DOI:
https://doi.org/10.59277/RRST-EE.2026.2.24Keywords:
Dual gas measurement, Geochemical applications, Active disturbance rejection control, Temperature control, Stability enhancementAbstract
An active temperature disturbance rejection method was developed to address uncertainties in temperature disturbances and to improve stability for field gas measurements. A symmetric convection heat conduction strategy was used to ensure uniform heating of the multipass cell (MPC). Active disturbance rejection control (ADRC) was adopted to address the nonlinear and uncertain temperature disturbance. The temperature fluctuation is less than 0.01℃ in the stable state during field experiments when controlled at 30℃. The maximum temperature fluctuation during gas sample replacement is less than 0.015 °C. For gas measurement results, CO2 and CH4 concentrations were monitored at 2100-3864 ppmv and 99-104 ppmv, respectively. This temperature control method provides a guarantee for field gas monitoring.
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