The measurement of internal deformation of asphalt pavement is essential for transportation network maintenance, from which the early stage fatigue of asphalt pavement can be detected and then retrofitted. However, existing transducers could only measure either point strains inside the asphalt pavement or the deformation at the surface. To fill this gap, a fiber Bragg grating sensing beam is developed, which can measure the internal deformation of the asphalt pavement under traffic loads. The design principles and working mechanism of the fiber Bragg grating sensing beam are presented in detail. A prototype of the fiber Bragg grating sensing beam was fabricated in the laboratory, and its measurement resolution and maximum deflection, as determined through a calibration test, are 0.29 mm/me and 87.1 mm, respectively. A physical model test established in the laboratory indicated that the fiber Bragg grating sensing beam has a good performance and thus can be used to measure internal deformation of the asphalt pavement.

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