光线及投影尺寸的测定已成为常用的技术.激光的优越性能与偏转技术的精确性,使得这一技术在计量学、自动化以及质量控制方面得到了广泛的应用.为避免意外,操作人员应当掌握光学投影成象的内部规律.激光也是一种光,因此也应遵守所有的光学定律.激光是一种高能密度的单色相干光,成束性强,只有轻微的发散.应用诸如偏振滤光片,静噪滤波器等这一类(单独使用或是组合在一起)的光学装置,就能接收与其它光源相比这种具有巨大能量的光,用于检测各种物体.这些检测方法术语统称为《激光扫描》,其表示的检测原理是以激光束致偏为基础的.致偏可以通过旋转镜,检流计式的振荡器,音叉,或是通过振荡棱镜实现.偏转光束通过透镜、复合透镜或抛物面镜之后,转变成对物体进行扫描的平行传输光束.人眼所见这样的光束是一条红线,此红线的高度和长度确定了扫描场或检测范围. The determination of light and projection size has become a common technique. The superior performance of laser and the accuracy of deflection technology make this technology widely used in metrology, automation and quality control. To avoid accidents, operators should master The internal laws of optical projection imaging. Laser is also a light, and therefore should also comply with all the laws of optics. Laser is a high-energy density monochromatic coherent light, strong beam with only slight divergence. Applications such as polarization filter Optical devices such as filters, mute filters, and the like (singly or in combination) receive light of great energy as compared to other light sources for the detection of various objects. The terms of these detection methods Collectively referred to as “laser scanning,” which indicates that the detection principle is based on laser beam deflection, which can be achieved by a rotating mirror, galvanometer-type oscillator, tuning fork, or by oscillating prism.The deflected beam passes through a lens , A compound lens or a parabolic mirror, into a parallel transmitted beam that scans the object. The human eye sees such a beam as a red line whose height and length determine Scan field or detection range.