| 摘要 |
PURPOSE:To ensure the measurement of flatness accurately, by judging the presence or absence of the strain of a plate material in the longitudinal direction, based on the detected values of a plurality of hydro sensors, and obtaining the amoung of the strain based on the one detected value of the hydro sensors. CONSTITUTION:A water stream 12 is jetted on a steel plate 10. The length of the water column reaching the steel plate 10 is detected by hydro sensors 141- 143. The detected values therefrom are imparted in a strain operating device 16. Said strain operating device 16 compares the simultaneously measured and detected values from the hydro sensors 141-143 with a preset value, and judges the presence or absence of the strain in the longitudinal direction of the steel plate 10. The amount of strain is computed based on the detected value of one of the hydro sensors 141-143 in correspondence with the judged result. The amount of strain is displayed on a display device 18.
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