一种新型近似无衍射栅型结构光及其实现方法  

Approximate Non-diffracting Grating Structured Light and Implementation Method

作　　者：瞿丹[1] 周莉萍[1] 徐龙[1] 陈良洲[1] 干江红[1] 

机构地区：[1]华中科技大学机械科学与工程学院仪器系,武汉430074

出　　处：《光电工程》2010年第9期140-144,150,共6页Opto-Electronic Engineering

基　　金：国家自然科学基金项目(50975112);湖北省自然科学基金项目(2009BCD)

摘　　要：本文提出一种新型的近似无衍射栅型结构光的概念与实现方法。该结构光具有焦深长、线宽细、在一定范围内光场分布稳定、光场光强不变等特点。文中采用精密三角截面棱镜组成的光学系统生成近似无衍射栅型线结构光,用惠更斯-菲涅尔原理及基尔霍夫衍射理论对该系统进行了理论分析和计算,并在无衍射范围内对近似无衍射栅型结构光的光场分布进行了数值仿真。文中对系统进行了实验对比及验证,结果表明,实验数据与理论计算及仿真结果基本一致。应用文中的系统参数,获得了条纹宽度为18μm,焦深范围为570cm的近似无衍射栅型结构光,其条纹宽度及光场强度分布不随距离而变化。与传统的光源相比,近似无衍射栅型结构光在三维轮廓测量等应用中具有分辨率高、精度高等优势。A new concept of Approximate Non-diffracting Grating Structured Light （ANGSL） and its implementation method are proposed. ANGSL has characteristics of long focal-depth, narrow strip-width, steady light field, and constant light intensity in certain rang etc. An optics system with a precise triangular-section prism is set up to produce ANGSL. Applying Huygens-Fresnel principle and Kirchhoff theory, theory analysis and calculation are completed. The distribution of the light field is simulated in the non-diffracting range. Experimental results show that experimental data is in good agreement with the theory calculation. According to system parameters, ANGSL is produced with 18 μm strip-width and 570 cm non-diffracting range, whose strip-width and intensity distribution do not change with transmitting distance. Compared with traditional light source, ANGSL has advantages of high resolution and precision in the application of 3D profile measurement.

关 键 词：无衍射栅型结构光 精密三角截面棱镜 投影光源 三维轮廓测量 

分 类 号：TH744.5[机械工程—光学工程]