Various embodiments of a gas burner igniter assembly are shown, described, and claimed herein. To increase the measurement reliability, it is proposed that a control value is determined from a time-dependent andor wavelength-dependent change in the measurement signals and that the measurement signals are processed as valid or discarded as erroneous depending on the control value. The premix tube is fabricated from a second alloy such that the premix tube is configured to exhibit a second frequency that is different from the natural operating frequency of the gas turbine engine.