Radiation thickness gauge for steel plate, calculates output difference of detectors by selecting and multiplying correction count when object moves to to-be-measured optical axis direction perpendicular to pass-line plane

摘要

The gauge (10) has square C-shaped frame (1d) provided in direction perpendicular to pass-line plane, which conveys to-be-measured object (3) so that object is arranged between arms of frame. A detector unit (1) has main detector (1b) and subdetector (1c) to detect transmitted radiation and radiation from object scattered around main detector. A calculator (2b) calculates thickness from output difference of detectors obtained by selecting and multiplying correction count when object moves to optical axis direction perpendicular to pass-line plane.