Based on structure of piezoelectric quartz crystal resonator（ PQCR） in series with a planar spiral inductor（ PSL）

the system combines with field programmable gate array（ FPGA）

wireless sensor networks（ WSNs） and C#

apply digital quartz crystal inductive sensor

which has simple structure and use frequency as output

to bridge vibration measurement. And use this as sensor probe to build up a set of bridge vibration wireless monitoring system. The system is mainly composed of sensor probe

FPGA system

Zig Bee network

C # upper computer and has the characteristics of simple structure

good stability and digital output. It achieves non-contact

wireless

real-time monitoring on low-frequency vibration signal.