Fibre Bragg grating sensor device for detecting physical dimensions incorporates a light waveguide with fibre Bragg grating fastened under pre-tension between two locking elements

摘要

Next to locking points a fibre optic waveguide (5) connects firmly across its longitudinal axis to a crosspiece (2) stressed for bending. Fitted near one or more locking points, a retaining element holds the fibre optic waveguide at a preset distance from the neutral fibre of the crosspiece. A free end (10) has a fastening device (11) for a pulling element like a steel wire secured by a crimping sleeve (12).