提供了一种用于测量钢板的平坦度的装置和方法。 用于测量钢板的平整度的装置包括激光模块，其以恒定速度在钢板的宽度方向上发射线性激光束; 视频获取单元周期性地获取由发射的衬垫激光束产生的视频，并且包括相对于钢板的宽度方向的二维轮廓; 轮廓产生单元，其生成三维轮廓，其中钢板的波浪通过布置包括在沿钢板的纵向方向周期性地获取的视频中的二维轮廓而被反射; 以及平坦度计算单元，其基于沿着钢板中心沿长度方向产生的三维轮廓的总长度和所生成的三维轮廓的长度方向的总长度来计算钢板的平坦度 沿着钢板的边缘单元。 因此，本发明能够精确地测量平坦度并使由于振动导致的误差最小化。

Flatness of the steel sheet is also provided with a measuring device and method. Flatness measuring devices of the steel sheet is, as the laser module to check if the line laser in the width direction of the steel sheet moving at a constant speed, is generated by the irradiation line laser, the image including a two-dimensional profile for the width direction of the steel strip an image capture unit, and a cost by arranging the two-dimensional profile, that are included in the image, which is periodically obtained by the longitudinal direction of the steel sheet, the profile to generate a three-dimensional profile, the wave of the steel sheet is reflected generating section and generates three-dimensional profile for periodically obtained with respect to, on the basis of parts of the edge of the total length of the steel sheet length calculated in the direction along the center of the steel plate to the total length length determined in the direction along by including a flatness calculating section for calculating a flatness of the steel sheet, the precise flatness can be measured, and It can reduce the errors caused by vibration to a minimum.