LDT with Crimps Vibration Sensor/Switch Piezo Film Sensors High Sensativity AC Coupled Laminated Robust The LDT0-028K is a flexible component comprising a 28 µm thick piezoelectric PVDF polymer film with screen-printed Ag-ink electrodes, laminated to a 0.125 mm polyester substrate, and fitted with two crimped contacts. As the piezo film is displaced from the mechanical neutral axis, bending creates very high strain within the piezopolymer and therefore high voltages are generated.
LDT with Crimps Vibration Sensor/Switch examples of properties Four different experiments serve to illustrate the various properties of this simple but versatile component. Experiment #1 LDT0 as Vibration Sensor - with the crimped contacts pushed through a printed-circuit board, the LDT0 was soldered carefully in place to anchor the sensor.
LDT with Crimps Vibration Sensor/Switch examples of Properties (continued) TABLE 2: LDT0 as Flexible Switch (see Fig 2) Tip Deflection Charge Output o/c Voltage Output 2 mm 3.4 nC 7V 5 mm 7.2 nC 15 V 10 mm 10 - 12 nC 20 - 25 V max (90Ε) > 30 nC > 70 V Experiment #3 LDT0 Electrical Frequency Response when the source capacitance of around 480 pF is connected to a resistive input load, a high-pass filter characteristic results.
LDT with Crimps Vibration Sensor/Switch Experiment #4 LDT0 Clamped at Different Lengths using simple clamping fixture, the vibration sensitivity was measured (as in (1) above) as the clamp was moved to allow different "free" lengths to vibrate. The sensor may be "tuned" to suit specific frequency response requirements (see Table 4, Fig. 4). TABLE 4: LDT0 Clamped at Different Lengths (See Fig.
