PIEZO Vibration Sensor

Piezo Vibration Sensor is used for measurements of flexibility, vibration, impact, and touch. This module is based on the PZT film sensor LDT0-028. When the sensor moves back and forth, the voltage comparator inside the sensor induces a certain voltage (up to +/-90V is created). Therefore a wide dynamic range (0.001Hz~1000MHz) ensures excellent measuring performance and high reliability. The onboard potentiometer with a screw in the sensor is used to adjust its sensitivity. A simple resistor should get the voltage down to ADC levels.

The basic piezo vibration sensor works on the principle of the piezoelectric effect. A piezoelectric crystal placed between two metal plates arranged in a perfect balance does not conduct an electric current. When any Mechanical stress or force is applied on the material by the metal plates, which forces the electric charges within the crystal out of and appear on opposite sides of the crystal face. As a result, these metal plate collects charges, further used to produce a voltage and send an electrical current through a circuit–generating piezoelectricity. Thus this Small Horizontal low-cost cantilever-type vibration sensor is loaded by a mass to offer high sensitivity at low frequencies.

The active sensor area is protected for improved RFI/EMI rejection. Moreover, this  Rugged, flexible PVDF sensing element is designed to withstand high shock overload with excellent linearity and dynamic range. As a result, used for detecting either continuous vibration or impacts.

Applications:

• Washing Machine Load Imbalance
• Vehicle Motion Sensor
• Anti-Theft Devices
• Vital Signs Monitoring
• Tamper Detection
• Impact Sensing