Bragg network extensometer for monitoring works of art, comprises optical fibre which has Bragg networks inscibed within and is covered by a reinforced plastic core also measuring equipment

摘要

The extensometer consists of an optical fibre (4) which has Bragg networks (Rn) formed internally by photoincription and is connected to an optical switch and measurement unit (10,8). A reinforced plastic core (6) is co-extruded around the glass fibre and makes contact with the host material (2). Anchors (An) are firmly connected to the core and placed on either side of each Bragg network