Fiber optic deformation gauge
A sensor for the measurement of deformations and strain in concrete by optical fiber
The StrainLux© deformation gauge sensor consists of a flexible monolithic test body to be glued on the element to be measured (optical gauge). A silica optical fiber, in which a Bragg grating is inscribed, is permanently pre-tensioned in this gauge.
The fiber’s attachment system is constituted by a device guaranteeing maintenance without drift of the fiber after thermal aging (3 cycles at -20 / 65°C).
The Bragg grating is a passive optical microcomponent photo-inscribed inside the fiber. During its reading (like a barcode) this grating is flooded by a wide spectrum light.
Micrometric deformations of the grating induce variations, which then induce variations of the reflected wavelength. The reading of the grating can be done from several kilometers away.
Measuring total deformations.
Monitoring in all types of electromagnetic environments (lightning, cable, high voltage, electromagnetic noise).