| 摘要 |
A unitary displacement sensor includes a circuit, a first device for measuring acceleration, a second device for measuring a magnetic field, a wireless communications module, and a power source coupled to the circuit, the first device, the second device, and wireless communications module such that the circuit is configured to cause the power source to activate the wireless communications module and the second device when a level of acceleration measured by the first device meets or exceeds a predefined threshold level of acceleration and the wireless communications module is configured to transmit a measurement by the second device of the magnetic field. |
