A novel fiber corrosion sensor based on distributed Brillouin optical time domain reflection(BOTDR) has been developed,which can monitor steel corrosion in concrete structures.The choosing method of valid sampling points on optical fiber was proposed,and furthermore,the evaluation formula was derived to make quantitative assessment of steel corrosion.The properties of BOTDR fiber corrosion sensors embedded in concrete structures were researched in the electrochemical corrosion accelerating testi...