MEASUREMENT SYSTEM FOR THE WIRELESS POSITION-INDEPENDENT MEASUREMENT OF THE TEMPERATURE
First Claim
1. 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,whereinthe 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, whereinthe 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.
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Accused Products
Abstract
The invention relates to a measurement system for the wireless and position-independent measurement of the temperature of the load of an oven with high accuracy using passive temperature probes. The measurement system for the wireless measurement of the temperature of food or workpieces in ovens has an interrogation unit located outside the oven chamber, one or more interrogation antennas located in the oven chamber and at least one passively operated temperature probe with a probe antenna and at least one temperature sensor designed as a resonator, said temperature probe being freely movable within the oven, characterized in that the temperature sensor has at least two resonances with different temperature coefficients of frequency, wherein the electrical equivalent circuit diagrams of the resonance elements differ only slightly from each other.
7 Citations
12 Claims
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1. A system for the wireless measurement of the temperature of the load in an oven having:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification