Temperature measurement system employing an electromagnetic transponder and separate impedance-changing parasitic antenna

An assembly, comprising:

• a magnetic induction heater comprising an upstanding housing having a sidewall and a top wall, and a work coil within the housing and operable to generate an alternating magnetic field;
• and
• a dome including a body presenting a central section and a peripheral skirt depending from said central section, said central section having an induction-heatable component therein,
• said dome removably positioned on said heater with said central section adjacent said housing top wall and with said skirt adjacent said sidewall, so that operation of said work coil will inductively heat said component,
• said dome central section having a temperature sensor including
• a transponder including a transponder antenna and a circuit operably coupled with the transponder antenna, said circuit operable to extract energy from electromagnetic signals received by said transponder antenna, and to generate transponder reply signals containing reply information;
• and
• a parasitic antenna having an impedance value and operable to be excited by said transponder reply signals in order to generate parasitic antenna reply signals containing said reply information,
• said transponder antenna and said parasitic antenna being in proximity and electromagnetically coupled when said electromagnetic signals are received,
• said parasitic antenna including a temperature-sensitive transducer operable to change the impedance value of the parasitic antenna in the event that said component reaches a predetermined temperature, to thereby change a detectable parameter of said parasitic antenna reply signals.