OL-WA Optical Strain Gauge: Extremely Robust Fiber Bragg Grating (FBG) based Sensor

The OL-WA optical strain gauge was specially developed to withstand extremely harsh operating conditions, which would likely damage the adhesive bond of classic optical strain gauges. It is especialy well-suited for high strain applications. As it can be spot welded to steel structures and materials, the OL-WA features rugged fiber leads with armored cable protections. These sensors can be delivered in optical chains readily prepared to ease on-site installation.

The OL-WA optical strain gauge can also be used for temperature compensation (see installation manual for further information). For that, it needs to be welded to a steel body (OTC-WA-Plate) that can be ordered together with the sensor without additional cost.

  • For the spot welding process the Heller c30 Impulse Welding Device is recommended (not available in the US).


Dimensions of OTC-WA-PLATE in millimeters (steel 1.4301):


  • Inherent immunity to all electromagnetic effects (EMI, RFI, sparks, etc.)
  • Electrical isolation

Safe operation in hazardous environments (e.g. potentially explosive environments, high voltage areas and intense electromagnetic fields)

Extremely Robust

  • Stainless steel packaging and steel reinforced coating
  • Outstanding bending capability (6 micron core fiber)

Accurate results during 24/7 operation in aggressive atmospheres and under harsh environments even on curved surfaces


  • Based on the measurement of an absolute parameter
  • the Bragg wavelength
  • independent of power fluctuations

Self- referenced: high quality measurements with long term stability

Easy to Install

  • Easy installation by simple spot welding method

Long service life with a permanent non-degradable attachment to the structure material

Product Literature

Title / Description Language
Data Sheets
Instructions for use
English, German
Get a quote now!

Ask your HBM Sales Engineer

Please send me


Ask your HBM Sales Engineer

Please send me


Individual offer

Technical advice

Fast response