Browsing by Issue Date, starting with "1994"
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- Demultiplexing of fibre Bragg grating temperature and strain sensorsPublication . Brady, G.P.; Hope, S.; Lobo Ribeiro, Antonio B.; Webb, D.J.; Reekie, L.; Archambault, J.L.; Jackson, D.A.We describe a demultiplexing scheme for fibre optic Bragg grating sensors in which signal recovery is achieved by locking each sensor grating to a corresponding receiver grating. As a demonstration, the technique is applied to strain and temperature sensing, achieving a resolution of 3.0 με and 0.2°C, respectively.
- Multiplexing interrogation of interferometric sensors using dual multimode laser diode sources and coherence readingPublication . Lobo Ribeiro, Antonio B.; Rao, Y.J.; Jackson, D.A.A multiplexing topology with virtually no cross-talk is demonstrated for a sensor network based upon low coherence interferometry, in which a scanning interferometer simultaneously interrogates all the sensors. Dual wavelength operation using two multimode laser diode sources is implemented. The concept is demonstrated by multiplexing two bulk optical Michelson interferometers. For both sensors the achieved resolution was of the order of 1 nm, with a working range of 45 μm.