| 摘要 |
A wireless temperature measurement system comprises an RF transmitter 100, a temperature sensor 200, an RF receiver 300 and a processor unit 400. The transmitter 100 is operable to transmit an RF signal which is scanned over a range of frequencies. The receiver 300 is similarly operable to detect the transmitted signal and determine its magnitude at a particular detected frequency. The temperature sensor 200 comprises an antenna 201 and a resonant circuit 202 wherein the resonant circuit 202 is adapted such that its resonant frequency varies with temperature. By monitoring the proportion of the RF energy transmitted by the transmitter 100 absorbed by the temperature sensor 200 using receiver 300 over the scanned frequency range, the processor unit 400 is operable to determine the resonant frequency of the resonant circuit 202 and hence determine local temperature of the temperature sensor 200. |
