OEP-C Fiber Optic Extensometer Sensor

For Concrete embedment

Based on Opsens Solutions’ unique WLPI signal conditioning technology (Patent # 7,259,862) and the inherent advantages of fiber optics strain sensor, the robust extensometer is designed to provide a 100% survivability. Not affected by transverse strain and without drifting over time, the concrete embeddable extensometer is perfectly tailored for permanent monitoring of infrastructure, provide continuous reliable measurements in almost any conditions.

The fast response sensor can be used in both dynamic and static surveillance applications. It will not be affected by the surrounding environment like other sensing technologies. For instance, no need to compensate for temperature variation.

The robust stainless steel design can be fixed inside the formwork or cast directly into the wet mix. A string of extensometers integrated into a single cable is also available. This enable strain monitoring on multiple location of a structure, without complex cable management.

Different cables and sheath options are available, to meet customer specific requirements.


  • Maintenance free without drifting over time
  • Outstanding repeatability
  • Insensitive to transverse strains
  • Intrinsically safe
  • No Temperature compensation required


  • Pile testing
  • Dam and tunnel surveillance
  • Structural integrity of bridge and viaduct
  • Road pavement instrumentation
  • Foundation monitoring in High Voltage encironments
  • Concrete structure in Nuclear and hazardous environments


Measuring range (other ranges available on request)

-1 000 µε


 +1 000 µε

-2 500 µε


 +2 500 µε


0.15 µε

Temperature sensitivity


Temperature strain range


Temperature operating range

-40°C to +60°C (other temperatures available on special request)

EMI/RFI Susceptibility

Complete immunity

Cable Lenght

Up to 3 km (Sampling rate dependent, consult factory for more details)

Optical connector

SCA (Standard), SC (Standard), other connector available on request

Signal conditioner comptability

All Opsens Solutions’ WLPI signal conditioners

External casing

Stainless Steel 316L

Linearity, repeatability and hysteresis error (combined)

< 0.15%

Opsens Solutions Inc. reserves the right to make any changes to the above specifications without prior notice.

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