A high-sensitivity fiber grating pressure sensor was designed and implemented for load monitoring of asphalt pavement.The sensor used a combination of metal materials and polymer for packaging,and the pressure sensitivity was improved obviously by changing the form of polymer.The analytic formulas between pressure and relative shift of Bragg wavelength of in-fiber Bragg grating were derived.The experimental results show that the pressure sensitivity coefficient is up to 2.39×10-8 Pa-1,which is a...