METHOD FOR MEASURING THICKNESS BY RADIATION TRANSMITTING TYPE THICKNESS METER

摘要

PURPOSE:To make it possible to measure a thickness with high accuracy, by detecting the elongation of a housing to which a radiation source and a radiation intensity detector are fixed in opposed relationship and correcting the output of a radiation intensity detection value based on the detection value. CONSTITUTION:When the thickness of a rolling material 14 is measured from the transmission quantity of radiation in such a state that a radiation source 10 and a radiation intensity detector 16 are mounted to the housing of a rolling machine 60, the elongation of the housing of the rolling machine 60 generated at the time of rolling is detected. The elongation quantity of the housing may be calculated according to a gauge meter system, for example, by measuring rolling repulsive force by load cells 54A, 54B. This elongation quantity is inputted to a second correction apparatus 56 and, according to the correction value, the detection value (t) from the radiation intensity detector 16 is corrected. By this method, the effect of the variation in distance between the radiation source 10 and the detector 16 can be removed and a rolling thickness can be accurately measured.