0-1005447-1【PDF 1/4 页】SENSOR PIEZO FILM VIBRA MASS

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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

dimensions

Solder Tab Connection

Both No Mass & With Mass Version

Withstands High Impact

Operating Temperature: 0 o C to 85 o C

Storage Temperature: -40 o C to 85 o C

Higher Temperature Version up to 125 o C

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

10/13/2008

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