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EFO Embeddable Strain Sensor

The EFO is a 70-mm long fiber optic strain gauge designed to be embedded in concrete. It consists of a stainless steel body, with two flanges for better adherence to concrete.

The sensor is based on Fabry-Perot interferometry. The strain gauge is bonded in a very small diameter longitudinal hole located in the center of the steel body.


The EFO embedded strain gauge can be installed into concrete structures in two different ways: it can be cast directly into the wet mix or encapsulated into a concrete briquette which is then cast into the wet mix. It is also possible to set the gauge into hardened concrete by grouting it or the briquette containing the EFO into a pre-drilled hole.

The sensor may be configured for use in special concretes, like high performance and powder reactive concretes.


Roctest Ltd.
680 Birch Street
Saint-Lambert, Quebec
Canada J4P 2N3
Tel: +1 450 465 1113
Toll free: 1 877 762 8378
Fax: +1 450 465 1938

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