Temperature measurement system employing separate passive antenna with electromagnetic transponder and variable impedance

摘要

The temperature measurement system (20) has a temperature sensor (22) and an electronic signal interrogator (24). The temperature sensor (22) comprises a transponder (26) having an antenna (28) and a separate parasitic antenna (32) having temperature sensitive transducers (34, 68-74, 78a-84a), while The interrogator (24) has a transmitter (42) and an antenna (40). With the interrogator (24) placed close to the object, the sensor (22) is placed in thermal contact with the object whose temperature is to be measured. The system (20) may be used with a tableware dome (88, 114) that is preheated and placed on the hood bearing plate to maintain the temperature of the food. [Selection] Figure 9