TE Connectivity FLDT1-028K Piezo Film Sensor, 28µm PVDF, 10mV~100V Output, 1.37nF, Flexible Lead

The sensor requires a high-impedance buffer or voltage follower circuit due to its high output impedance and 1.37nF capacitance. Connect it to an op-amp configured as a non-inverting buffer with an input impedance greater than 1MΩ. The output of this buffer can then be fed into the ADC of a microcontroller like an Arduino or Raspberry Pi. For AC-coupled measurements, a high-pass filter may be added to block DC offset.

No, the FLDT1-028K is designed for dynamic or quasi-static measurements. Piezoelectric PVDF sensors generate a charge in response to changes in applied stress (dF/dt). The output voltage will decay under a constant static load due to the material's inherent charge leakage. It is best suited for sensing vibrations, impacts, or any time-varying mechanical stimulus.

The flexible printed leads are terminated with exposed solderable pads. Use a low-temperature soldering iron and minimal solder to attach wires. For mounting, the sensor can be adhered using a thin, flexible double-sided tape or a compatible epoxy, ensuring full surface contact. Avoid Sharp Microelectronics bends directly at the film edge and protect the connection joint with strain relief, such as a bead of silicone, to prevent lead fatigue.

The recommended load impedance range (1MΩ to 10MΩ) optimizes the sensor's frequency response and output voltage level. A load impedance that is too low will excessively attenuate the signal and reduce sensitivity, especially at lower frequencies. Using an impedance within this range, typically provided by the input stage of a buffer amplifier, ensures a stable, high-fidelity signal transfer from the piezoelectric element to your measurement circuit.