PASSIVE SENSOR, WIRELESS TYPE SENSOR SYSTEM, AND MEASUREMENT METHOD USING WIRELESS TYPE SENSOR SYSTEM

摘要

This invention is directed to achievement of a wireless type sensor system that exhibits high measurement precision even if individual differences exist due to the variations in manufacture between sensor elements or the like. A passive sensor (10) comprises a SAW resonator (12) and an identification mark (13). The identification mark (13) is a mark corresponding to identification group information (Gr). A master device (20) transmits an excitation signal (SpL) to the passive sensor (10) and receives a resonation signal (Sfp) of the SAW resonator (12) to acquire a resonation frequency (fp). Further, the master device (20) reads the identification mark (13) to acquire the identification group information (Gr). The master device (20) then calculates a magnetic intensity on the basis of the resonation signal (fp), the identification group information (Gr) and a magnetic intensity-to-frequency characteristic for each of a plurality of pieces of identification group information (Gr) stored in advance.