| 摘要 |
A tire internal pressure measuring system (1) comprises a detector (40) for detecting the internal pressure of a tire, and an acquisition device (20) for acquiring data relating to the internal pressure of the tire detected by the detector (40). An antenna unit (51) of the acquisition device (20) generates induced electromotive force in an antenna unit (42) of the detector (40) by electromagnetic induction, and acquires a resonant waveform in tune with the resonance of an LC resonance circuit configured from a capacitance sensor (41) charged with the electromotive force generated in the antenna unit (42) and the antenna unit (42). The acquired resonant waveform is frequency-divided, and a capacitor (C) is charged during a period from the rising edge to the falling edge of the waveform obtained by the frequency dividing. The value of charged voltage is associated with the tire internal pressure. |
