1005646-1 Datasheet, PDF (1/4 Pages) Tyco Electronics – Typiicall Applliicattiions fforr Piiezo Fiillm Sensorrs

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. When the assembly
is deflected by direct contact, the device acts as
a flexible "switch", and the generated output is
sufficient to trigger MOSFET or CMOS stages
directly. If the assembly is supported by its
contacts and left to vibrate "in free space" (with
the inertia of the clamped/free beam creating
bending stress), the device will behave as an
accelerometer or vibration sensor. Adding mass,
or altering the free length of the element by
clamping, can change the resonant frequency
and sensitivity of the sensor to suit specific
applications. Multi-axis response can be
achieved by positioning the mass off center. The
LDTM-028K is a vibration sensor where the
sensing element comprises a cantilever beam
loaded by an additional mass to offer high
sensitivity at low frequencies.
FEATURES
• Solder Tab Connection
• Both No Mass & With Mass Version
• Withstands High Impact
• Operating Temperature: 0ºC to 85ºC
• Storage Temperature: -40ºC to 85 ºC
• Higher Temperature Version up to 125 ºC
available on a Custom Basis
APPLICATIONS
• Vibration Sensing in Washing Machine
• Low Power Wakeup Switch
• Low Cost Vibration Sensing
• Car Alarms
• Body Movement
• Security Systems
LDT0-028K Piezo Vibration Rev 1
www.meas-spec.com
1of 4
dimensions
10/13/2008