DEVICE AND METHOD FOR MEASURING AMOUNT OF CORROSION IN BOTTOM OF RAIL

摘要

PROBLEM TO BE SOLVED: To provide a device for measuring an amount of corrosion in the bottom of a rail, precisely measuring an amount of corrosion in the bottom of a rail even if there is wear in the head of a rail, and to provide a method therefor. SOLUTION: The method for measuring an amount of corrosion in the bottom of a rail includes the steps of: contacting an ultrasonic probe 12 to the top face of the head of a rail 1 having a head 1a, an abdomen 1b of which the horizontal width of a cross section shorter than that of the head 1a, and a bottom 1c of which the horizontal width of a cross section longer than that of the abdomen 1b; entering ultrasonic waves into the top face of the head vertically, at that time entering slightly diffused ultrasonic waves; detecting jaw-reflection echoes from a jaw 1d equivalent to the lower face of which the horizontal width of a cross section greater than that of the abdomen 1b of the head 1a of the rail and bottom-reflection echoes from the bottom 1c of the rail; determining the space between the jaw and a bottom-reflection source by the jaw-reflection echoes and the bottom-reflection echoes; comparing a measured value L of the space between the jaw and the bottom-reflection source with a reference value LO; deciding that there is bottom-corrosion of the rail when the measured value is smaller than the reference value; and determining the amount of the corrosion by the differenceΔL between the measured value L and the reference value LO. COPYRIGHT: (C)2009,JPO&INPIT