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Electrical and electronic engineering
In this letter, we propose a high resolution temperature insensitive interrogation technique for FBG sensors where one FBG acts as an edge filter to interrogate a separate FBG sensor. A high resolution of better than 5 με in strain measurement range from 0 to 1100 με and the best resolution of better than 1 με were verified by experiments. An error of only ±2.2 με is achieved over a temperature range from 15 to 50 °C, indicating that this strain interrogation technique is temperature insensitive. Using an altered system configuration, the temperature was also measured simultaneously with a resolution better than 0.2 °C.
Wu, Q. et al. (2010) Optimum Design for Maximun Wavelength Resolution for an Edge Filter Based Ratiometric System. Optics & Laser Technology Vol. 42, no. 6,pp.1032-1037. doi:10.1117/12.831418