Abstract
The principle of operation of a multi-parameter dual Bragg grating fiber optic sensorformed in a polarization maintaining fiber is described. The response of the sensor toseparately applied longitudinal loading, transverse loading and temperature change ispresented in terms of wavelength shifts of the Bragg peaks. Results of those tests areused as sensor calibration data. A model to predict the longitudinal and twoorthogonal transverse strain components from measured wavelength shifts ofthe Bragg peaks observed in combined loading tests is described. The modelis based on an assumed linear behavior between wavelength shifts and sensorloadings and uses the calibration data as input. Predictions of transverse strain arecompared with applied strains in the combined loading tests and found to beinadequate for transverse strain components. A model for predicting strains isthen developed to account for non-linearities between transverse loading andwavelength shifts observed in sensor calibration data. Predictions of longitudinalstrain and both transverse strain components from measured wavelength shifts incombined loading are seen to be in excellent agreement with applied test strains.
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