Measurement system for the wireless position-independent measurement of the temperature

A system for the wireless measurement of the temperature of the load in an oven having:

• an interrogation unit,
• one or more interrogation antennas that can be positioned within the oven chamber,
• a passively operated temperature probe with a probe antenna and with at least one temperature sensor designed as a resonator, wherein the temperature probe can be positioned within the oven chamber,
• an evaluation unit,
• wherein the temperature sensor has at least a first resonance element and a second resonance element,
• wherein
• the evaluation unit is designed to determine the temperature of the load of the oven from the difference between the resonant frequency of the first resonance element and the resonant frequency of the second resonance element, wherein
• the first resonance element and the second resonance element are designed in such a manner that the dynamic resistance, the motional inductance and the motional capacitance of the first resonance element differ by less than 20% each from the dynamic resistance, the motional inductance and the motional capacitance of the second resonance element at 20° C.