  Real-time, low-cost, and wireless mechanical vibration monitoring is
necessary for industrial applications to track the operation status of
equipment, environmental applications to proactively predict natural disasters,
as well as day-to-day applications such as vital sign monitoring. Despite this
urgent need, existing solutions, such as laser vibrometers, commercial Wi-Fi
devices, and cameras, lack wide practical deployment due to their limited
sensitivity and functionality. In this work, we propose and verify that a fully
passive, resonance-based vibration processing device attached to the vibrating
surface can improve the sensitivity of wireless vibration measurement methods
by more than 10 times at designated frequencies. Additionally, the device
realizes an analog real-time vibration filtering/labeling effect, and the
device also provides a platform for surface editing, which adds more
functionalities to the current non-contact sensing systems. Finally, the
working frequency of the device is widely adjustable over orders of magnitudes,
broadening its applicability to different applications.
