Rebar Embedded RFID Wireless Strain Sensor Data Logger – UHF EPC for Structural Health Monitoring (SHM)

These RFID wireless strain sensing data loggers are attached to 1-foot pieces of rebar.  They can quickly be tack-welded into a rebar structure before it is embedded in concrete.  Use a standard ThingMagic UHF RFID reader to to talk through the concrete to set the logging interval – and wirelessly download your time vs. strain readings at a later date.

Also, the strain readings can be “read now” at any time using the RFID reader.

  • RFID strain gauge sensors need no wires or batteries = no maintenance and long life.  The concrete structure protects the embedded sensor.
  • Can be read through materials, such as concrete, that typically cover structural components.  Typical read ranges are roughly a foot with concrete embedded sensors and 3 to 5 feet with on-metal mounted sensors.
  • Sensors can easily be installed on-site.
  • Strain sensors are temperature compensated.
  • Data-logging capability – track and compare for predictive maintenance.
  • Each wireless strain gauge sensor has a unique ID# so that many sensors can be read by one reader at the same time.
  • Quickly & easily monitor with an off-the-shelf UHF RFID reader.
  • Readings are stored to a file so that strain readings can be analyzed in a spreadsheet.

 

More information and a video demonstration is available on our “Passive RFID Wireless Strain Gauges” informational web page.

RFID Reader Starter Kit is sold separately.

Strain sensors are typically customized for specific applications. Contact us for pricing.

Description

We specialize in custom sensors.  If this isn’t exactly what you need, please contact us.

Rebar Embedded RFID Wireless Strain Sensor Data Logger – UHF RFID for Structural Health Monitoring (SHM)

  • Strain can be displayed in micro-strain and/or force (lbs or Newtons)
  • High Strain Sensitivity and Range.
    • Strain ranges are typically customized to the specific application.  Contact us for more information.
    • Typical strain ranges:  +/- 1500 u-strain and 0-10,000 u-strain.
    • Strain sensor resolution and accuracy are roughly 5% of the full range of the sensor.  Contact us for more information.
  • Typical strain sensor installation is for axial strain (not bending or torsional strain) with two half-bridge sensors on the top and bottom of the rebar.
  • 1-foot long instrumented “sister rebar” can be tack welded to a rebar structure in less than 1 minute.  Very fast installation to existing rebar structures.
  • Temperature Accuracy ±4°F (+/-2°C) typical. Greater accuracy is available for an additional calibration fee.
  • Strain sensors are temperature compensated.
  • Read with a standard Intermec or ThingMagic UHF EPC RFID reader.
  • Wireless communication allows for multiple embedded installation options
    • metal mount
    • inside wall
    • inside concrete (typical read ranges are 6 inches when the sensor is embedded 2 inches deep in the concrete)
  • Data logger battery typically lasts for 5 to 10 years.  After the battery dies, the sensor can be read in a “read now” battery-free RFID mode.
    • Also available: Embedded battery-free RFID strain sensors and long-range battery-powered strain sensors.  Contact us for more information.
  • Data logger can store 800 time-stamped readings.  Custom versions that also log temperature allow for 300 strain+temperature time-stamped readings.
    • Data logger can be configured to either “stop when memory is full” or “overwrite oldest data when memory is full”.
  • Additional on-board non-volatile read/write memory can store customized information about the sensor or structure.
  • Read multiple tags with one reader.  Allows for 2 strain sensors to be installed on a 3-dimensional rebar structure to see loading dynamics in the structure.
  • Small form factor for tight spaces or moving applications.  Typical sensor electronic enclosure size is 1.4 x 1.4 x 0.8 inches.
  • Patented design.
  • Custom versions available for specific environments.  Learn more about our custom sensor capabilities.

This wireless sensor is ideal for monitoring:

  • Structural health including bridges, roads and chassis.

More information is available on our “Passive RFID Wireless Strain Gauges” informational web page.  This page includes:

  • A video demonstration of the system
  • A use-case explanation where the sensors were deployed in the Seattle North Gate tunnel
  • An article on the RFID Journal on sensors
  • A presentation on this sensor from the 2015 RFID Journal Live trade show.
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Questions about Phase IV Engineering's RFID strain sensing technology? Need a quote for a specialized wireless sensor solution? Talk to one of our wireless sensing experts today.
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