The demands for miniaturization

low power and even self power in wireless sensor networks are put forward in the the popularization of electric Internet of Things. For the existing magnetoelectric structure of vibration sensors

it is suitable to harvest energy

whereas

their volume is generally larger and wired transmission methods are commonly used. Therefore

a self-powered wireless vibration sensor based on the double-coil double-beam reusable structure is designed and fabricated in this paper. Firstly

the relationships among natural frequency

magnetic flux density and parameters of the device are analyzed

and the influences of double-beam structure on vibration modes are explored. Then

the dynamic

static

and impact characteristics of single/double-coil devices are tested. The results show that the device has high sensitivity and linearity in detecting vibration speed and impact. Its operating frequency is 100~1 000 Hz

with a frequency response error less than 2%

and the sensitivity of single-coil devices is 51.8 mV·s/cm

while that of double-coil devices is 91.6 mV·s/cm. Compared to existing vibration sensors

the double-coil double-beam structure is used as a measuring element and reused as an energy harvesting element

which enables the device to have higher sensitivity

and lower frequency response errors

and significantly compresses its volume. In addition

the reusable structure enables the proposed sensor to be capable of integrating output response and self power

achieving timed vibration monitoring and triggered impact detection of electrical equipment.