 |
Fiber optic sensors are an increasingly important
emerging technology for Intelligent Structural Health Management systems. Fiber sensor
network costs are relatively low, and large distributed sensor networks are possible
using multiplexing techniques. We are configuring adaptive FBG networks using a novel
multiplexed photorefractive two-wave mixing (TWM) demodulation scheme. Unlike extant
scanned FBG demodulation systems, the TWM system can simultaneously measure high-frequency
signals from multiple vibration, impact or acoustic emission sensors. The system is unaffected
by quasi-static strains, and environmental effects such as temperature drift. |
