| 摘要 |
A warning system includes a monitoring device and a controlled device, wherein the controlled device includes a wireless transmitter, a wireless receiver, a phase analyzer and a warning indicator. The wireless transmitter can transmit a detection signal, and then the controlled device responses to the detection signal and transmits a feedback signal. The wireless receiver can receive the feedback signal. The phase analyzer can analyze a phase difference between the detection signal and the feedback signal. The warning indicator can perform a warning action when the phase difference is greater than a preset value. Moreover, a method for monitoring a controlled device is disclosed in specification.
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