This document summarizes a study on using piezoelectric sensors for vibration analysis and damage detection in composite plates. Piezoelectric wafer active sensors were attached to composite plate specimens containing embedded Teflon sheets to simulate damage. An experimental setup was used to generate actuation signals and record vibration responses from the sensors. Half-sine and rectangular impulse signals were tested. Frequency analysis of the monitored signals using wavelet transforms was performed to identify the presence and extent of damage. The study demonstrated the effectiveness of this active monitoring method for damage detection in composite structures.