Articles you may be interested inSimultaneous measurement of temperature and strain by combining a fiber Bragg grating and the pigtail fiber covered with epoxy resin Rev. Sci. Instrum. 82, 064904 (2011); 10.1063/1.3600902 Strain-independent temperature measurement using a type-I and type-IIA optical fiber Bragg grating combination Rev. Sci. Instrum. 75, 1327 (2004); 10.1063/1.1711155 Bragg grating performance in Er-Sn-doped germanosilicate fiber for simultaneous measurement of wide range temperature (to 500°C) and strain Rev. Sci. Instrum. 74, 4858 (2003); 10.1063/1.1619553 Dual temperature and strain sensor using a combined fiber Bragg grating and fluorescence intensity ratio technique in Er 3+ -doped fiber Rev. Sci. Instrum. 74, 2880 (2003); 10.1063/1.1569406Simultaneous strain-temperature measurement using fluorescence from Yb-doped silica fiber Rev.A fiber optic sensor device has been developed incorporating a short length of erbium doped fiber fused in close proximity to a single-fiber Bragg grating, to measure both the fluorescent lifetime decay and the wavelength shift in these respective elements, for temperature and strain determination. Calibration results obtained from this simple, low cost, intrinsic sensor scheme show standard deviation errors of 20.4 ⑀ and 1.2°C over strain and temperature ranges of 22-1860 ⑀ and 25-120°C, respectively.

Abstract:Fibre optic sensing devices have been produced for the dual measurement of strain and temperature using the combined properties of fibre Bragg gratings and the fluorescence lifetime of erbium-doped fibre. Two different sensors were constructed with the fibre Bragg grating written in normal fibre and also written directly in the Er 3 +-doped fibre. Results obtained indicate that this technique can be used to measure strains and temperatures with accuracies of approximately l. 2°C and 20.4 !-lE

Owing to the number limit of electrodes, the resolution is low in ECT system currently. But increasing the number of electrode plates will lead to decrease the area of electrodes and lower the SNR. In this paper, with the method of electrodes subdividing and rotational combination, the ECT measurement system of rotational capacitor electrodes array is built, which can increase projection data and improve reconstruction image resolution without decreasing the area of electrodes.