| 摘要 |
An objective of the present invention is to suppress a measurement error of a physical quantity which is dependent on a characteristic of a resonator without increasing the size of a resonator tag. A resonator tag (20) comprises an RFID (21) and a resonator (23). Resonator tag information including the fabrication date of the resonator tag (20) is stored in the RFID (21). A reader module (30) comprises an RFID communication control unit (31), a measurement signal transceiver unit (33), a measurement unit (35), and an RTC (36). The RFID communication control unit (31) acquires the resonator tag information from the RFID (21), and imparts the fabrication date to the measurement unit (35). The measurement signal transceiver unit (33) acquires a frequency (fp) from a reverberation signal (Sfp) of the resonator (23), and imparts same to the measurement unit (35). The measurement unit (35) acquires elapsed time information of the resonator from a timestamp of the RTC and the fabrication date, and corrects the frequency (fp) from the presented information. The measurement unit (35) computes a temperature (T) from the corrected frequency (fp). |
