Abstract: A new and practical technology for realizing temperature and strain separation sensing using a single fiber Bragg grating (FBG) is reported. When the diameter of a part of the cladding of the fiber Bragg grating becomes smaller, the entire grating can be regarded as two sub-gratings with the same period but different diameters. Theoretical analysis and experiments have confirmed that the two sub-gratings have the same temperature sensitivity and different strain sensitivity, thereby realizing the separation measurement of the two parameters of temperature and strain in the fiber Bragg grating sensor. Moreover, the center wavelength spacing of the two sub-gratings can directly measure the strain magnitude, and the temperature change does not affect the measured strain value. In the experiment, the diameter of a part of the grating cladding was corroded by HF acid to 82μm, and the strain response coefficients of the two sub-gratings were obtained to be 0100201nm/με and 01000858nm/με, respectively. The strain response coefficient of the two peaks was 0100116nm/με, and the temperature response coefficient of the two peaks was 0101nm/℃. Based on these results, the temperature and strain can be measured separately at the same time. Keywords: fiber optics; grating sensor; strain sensing; corrosion; temperature sensing
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