Piezo Sensor - Polymer Coaxial Cable0 pages

Piezo Polymer Coax Cable
Piezo Polymer Coax Cable Rev 1 www.meas-spec.com 05/12/2009
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Coaxial Design Piezo Sensor
Shielded Constuction
Ideal for Linear Application
Rugged
Water Resistant
Piezo Film Technology
FEATURES
• Passive, Long Length Sensor
• Very Tough, Water Resistant and Flexible
• Temperature Stability to 85°C
• Self-Shielded Coaxial Construction
• High Voltage Response
• Low Impedance Per Unit Length
• Field Repairable
• Simplified Interconnections
APPLICATIONS
• Perimeter Intrusion Detection
• Safety and Security Fencing
• Door Edge/Vehicle Bumper Switch
• Cable Tampering Detector
• Traffic Classification/Counting
• Weather Sensing/Rain/Hail
• Structural NDT/Strain/Vibration
• Underwater Acoustics
• Patient Mattress Monitor
• Sports Scoring/Foul Line
Piezo Cable is another form of Piezo polymer sensors.
Designed as a coax cable, the Piezo polymer is the “dielectric”
between the center core and the outer braid. When the cable
is compressed or stretched, a charge or voltage is generated
proportional to the stress.
Piezo cable has a number of advantages in certain
applications. Due to its coaxial design, the cable is selfshielded,
allowing its use in a high EMI environment. The
Piezo cable can be spliced to passive coax, using standard
coax splice techniques. It is extremely rugged and will stand
up to heavy loads as with the truck axle counting. Its linear
format makes it ideal for monitoring large areas.
Two versions of the Piezo cable are offered, copolymer and
spiral. With the copolymer version, a special version of the
piezo material is extruded directly onto the cable and then
polarized. With the spiral wrap, the PVDF film is double
helically would around the inner conductor. The copolymer is
a much more expensive raw material and is available only on
a limited basis.
Please note: It should not be assumed that the copolymer
cable will be available on a long term basis due to restrictions
on the availability of the raw copolymer resin.