Passive RFID Wireless Strain Gauge (Strain Gage) – Battery-Free

Phase IV Featured in RFID Journal Article

Read the RFID Journal feature article that describes how Phase IV’s unique battery-free RFID wireless strain sensor is embedded in the concrete tunnel liners and very accurately reports changes in tunnel structure loading.  The strain sensors are read with a standard ThingMagic Vega UHF RFID reader.  Click the link below to read the feature article on this strain sensor in the RFID Journal.


Also see the PowerPoint presentation on this North Gate Tunnel Strain Sensor project with a full array of photos.

North Gate Tunnel Strain Sensor PowerPoint Presentation

Winner of “The Most Practical SHM Solution for Civil / Mechanical Systems Award” 2017 at the IWSHM Structural Health Monitoring Conference  See a video of the demonstration at Stanford University that won the award.

Finalist for the Best New RFID Product of 2015

Finalist for Product of the Year 2015 at Sensors Expo

Winner of the Coolest Demonstration  at the April 2015 RFID Journal Live trade show.

Introducing the Breakthrough Leap Sensors® System!

A streamlined approach to sensors. • Designed specifically for industrial & commercial use.

Wireless sensor with industrial metal enclosure and external antenna

Passive RFID Wireless Strain Gauge Demo Video

Skip ahead to these video segments:

  • 0:00 Introduction
  • 0:40 Strain Sensors in Structural Health Monitoring (SHM)
  • 1:30 Example Project – North Gate Tunnel
  • 2:00 Breakthroughs in Wireless Battery-Free Strain Sensing
  • 2:36 Example Application – Instrumented Concrete Rebar
  • 4:15 RFID Data Logging
  • 5:40 Embedded “Read Now” Strain Sensing
  • 7:00 Rapid Installation
  • 7:30 RFID Strain Sensor Precision
  • 8:40 RFID Reader Backpack for Field Use
  • 12:30 Temperature Compensating

About our New Passive RFID Wireless Strain Gauge

Now, monitor stress, strain, shear, or load using a standard RFID reader. A wireless strain gauge system using Phase IV’s strain sensors (patent pending) can be inexpensively installed in extreme environments that were previously too difficult to monitor.

  • RFID strain gauge sensors need no wires or batteries = no maintenance and long life.
  • Can be read through materials that typically cover structural components, with read range up to several meters on a metal-mount sensor.
  • Strain resolution better than 2 u-strain using a standard strain sensor.
  • Sensors can be installed & calibrated on-site.
  • Use on-board temperature sensor for strain gauge temperature compensation, if needed.
  • 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.
  • Stores 471 strain readings or 247 strain & temperature readings to memory with a time-stamp.  The oldest records are over-written when the memory is full.
  • Quickly & easily monitor with an off-the-shelf UHF RFID reader.
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Questions about Phase IV Engineering's RFID & wireless sensor technology? Need a quote for a specialized wireless sensor solution? Talk to one of our wireless sensing experts today.
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Custom Options for RFID Wireless Strain Gauges

  • Active (battery-powered) strain gauges (strain gages) transmit hundreds of feet. Ultra-long-life batteries make them Practically Battery Free.
  • Can be read through materials that typically cover structural components, with read range up to several meters on a metal-mount sensor.
  • Battery-Assisted strain data loggers store strain readings over time. Communication with the sensor is done with an RFID reader.
  • Energy harvesting strain sensors using solar cells provide long-range sensor transmissions with no battery to maintain.