Long-range SAW temperature sensing system

The utility model belongs to the technical field of intelligentized and networked temperature monitoring and relates to a long-range SAW (Surface Acoustic Wave) temperature sensing system. The system comprises a plurality of signal readers; each signal reader corresponds to at least one SAW temperature sensor; the SAW temperature sensors are passive; each signal reader comprises a microprocessor, a radio frequency signal transmitter module, a radio frequency receiving module and a communication module; the signal readers can work synchronously by corresponding to a plurality of SAW temperature sensors in a frequency division multiplexing or time division multiplexing manner; and the plurality of signal readers can work alternately in a time division multiplexing manner so as to share the frequency resource of the same frequency band. The utility model has the advantages of purely passive sensing head, replacement free, maintenance free, high long-term reliability, small volume, flexile and convenient installation and the like; and the manner of frequency division multiplexing or time division multiplexing is adopted for multi-point detection.