| 摘要 |
PROBLEM TO BE SOLVED: To perform an ultrasonic measurement of, in particular, a thickness of a workpiece right after performed to an application of heat and dryness on an in-line with high accuracy in a production line.SOLUTION: The ultrasonic measurement method includes: actual measurement ultrasonic sensor units 41 and 42 that are composed of first and second ultrasonic sensors; a calibration ultrasonic sensor unit 43 that is composed of the first and second ultrasonic sensors for calibrating an actual measurement value by the actual measurement ultrasonic sensor units 41 and 42; and a reference material 7 which is arranged in the vicinity of a workpiece 6 and of which a thickness is measured by the calibration ultrasonic sensor unit 43. A thickness of the reference material 7 is measured by the calibration ultrasonic sensor 43 for calibration as a temperature of the reference material 7 is matched to a temperature of the workpiece 6, a thickness of the workpiece 6 is actually measured by the actual measurement ultrasonic sensor units 41 and 42 at the same time with or right after a measurement by the calibration ultrasonic sensor unit 43. The actual measurement value is corrected by the actual measurement ultrasonic sensor units 41 and 42, using a measurement value for the calibration, a final thickness of the workpiece 6 is thereby calculated. |
