On the other hand, the measurement for workpieces involves not only roughness, but also waviness and shape error in engineering applications, which requires the profilometer owns the characters of high-precision and large range at the same time.

而且,在工程应用中,不但要测量工件的表面粗糙度,还要测量表面的波度和形状误差,这就要求仪器同时具有高精度和大量程的特点。

In the traditional founded surface metrology, the irregular roughness of surface topography falls into three scales, which were form, waviness and surface roughness respectively, according to their corresponding wavelength or frequency.

传统的表面计量学中，表面形貌的这种不规则的粗糙性被划分到三个尺度之中，分别为形状误差、波纹度和表面粗糙度。