Measuring the surface temperature of a molecular beam probe in the flame front at pressures of $1$–$5$ atm

The method of probe sampling of gas samples is actively used to study high-temperature oxidation processes. This method directly provides information on the chemical composition of the reaction volume; however, the probe inevitably introduces thermal and gas-dynamic perturbations into the system. Surface temperature profiles of a quartz probe in a premixed $\mathrm{CH}_4/\mathrm{O}_2/\mathrm{Ar}$ flame were measured in the pressure range $1$–$5$ atm. Measurements were made by a non-contact method using a thermal imager, which was calibrated by thermocouple measurements taking into account the shielding by the flame. The obtained data can be used as boundary conditions for numerical simulation of the sampling process, which will significantly increase the accuracy of error estimation when using probe methods.