Optical Strain Sensors

K-OP-A: Armored Optical Sensors Chain

K-OP-A: Armored Optical Sensors Chain

Armored Optical Sensors Chain for Harsh Environments

The K-OP-A measurement chain is a configurable array of optical FBG (Fiber Bragg Grating) sensors that withstand extremely harsh operating conditions. Such conditions can likely damage the adhesive bond of classic optical strain gauges.

A K-OP-A chain of optical sensors can integrate in a single optical fiber both, OL-WA linear weldable gauges, well-suited for high-strain applications, and OR-WA weldable rosettes, which measure strain at different points and directions.

Suitable to be spot welded to steel structures and materials, the K-OP-A sensors feature rugged fiber leads with armored cable protection.

In addition, OL-WA linear gauges can be used for temperature compensation of other optical strain sensors. The only requirement is to weld them to a steel body (OTC-WA-Plate) that can be ordered together with the sensor.

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

Example of a configured chain:


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 environmental conditions, even on curved surfaces


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

Self- referenced meaning: 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

Components of the K-OP-A Optical Measurement Chain

OL-WA Optical Weldable Strain Gauge

OR-WA Optical Weldable Strain Rosette