A note on curvature and twist measurements using the Ligtenberg-Moiré method

In this note an alternative technique for measuring curvature and twist is discussed. The method relies on measuring the line spacing in a single exposure reflected pattern. Use of this technique appears to be preferable in many applications.     

莫尔技术的现状和展望

本文对莫尔技术的应用状况、关键技术及未来课题作了较为详细的叙述与评论。     

无衍射光莫尔条纹准直、跟踪和定位系统的研制

由于无衍射光莫尔条纹技术具有高的对心分辨精度和适用于长、短距离测量的特点,在此技术的基础上研制了激光准直跟踪和定位测量系统。它具有抗强光干扰和抗机械振动的特点,并具有高的定位、定向精度（0.12μm/5m）。     

The instrumental resolution of a moire extensometer in light of its recent automatisation

This paper assesses the instrumental resolution of a mechanical extensometer in light of its recent automatisation. The instrument takes advantage of the moire phenomenon of optical interference to measure angular rotation in two perpendicular planes and displacement in three dimensions. Our assessment systematically defines an analytical solution for the complete interpretation of a generic moire pattern and a set of mathematical approximations for the moire patterns used to measure rotation and displacement. The ultimate sensitivity of the automated instrument is determined on the basis of a generic least square differences fitting procedure while the instrumental resolution is defined on the basis of realistic, rather than optimal, scenarios: the resolution of the rotation measurements are in the order of 8.7 1 10⁻⁵ rad while the resolution of the displacement measurements are better than 5 μm. This assessment represents the first step towards a global numerical repository for processed data recorded by the automated extensometers.     

柴油机涡流室内非稳态温度场的测试和分析

柴油机涡流室内的温度场对着火和燃烧过程有非常重要的影响。作者首次采用激光莫尔偏折技术对涡流室内非稳态温度场进行了实机测试，获得了清晰的莫尔条纹图；建立了涡流室内温度场的轴对称模型及计算方法，进行了较精确的计算和分析，由此得到了一些有重要理论意义和实用价值的结果。     

Scanning tunneling microscope observations of non-AB stacking of graphene on Ni films

Microscopic features of graphene segregated on Ni films prior to chemical transfer—including atomic structures of monolayers and bilayers, Moiré patterns due to non-AB stacking, as well as wrinkles and ripples caused by strain effects-have been characterized in detail by high-resolution scanning tunneling microscopy (STM). We found that the stacking geometry of the bilayer graphene usually deviates from the traditional Bernal stacking (or so-called AB stacking), resulting in the formation of a variety of Moiré patterns. The relative rotations inside the bilayer were then qualitatively deduced from the relationship between Moiré patterns and carbon lattices. Moreover, we found that typical defects such as wrinkles and ripples tend to evolve around multi-step boundaries of Ni, thus reflecting strong perturbations from substrate corrugations. These investigations of the morphology and the mechanism of formation of wrinkles and ripples are fundamental topics in graphene research. This work is expected to contribute to the exploration of electronic and transport properties of wrinkles and ripples.      

用激光偏转术诊断双温模型电弧等离子体

本文提出了一种单波长激光偏转术诊断双温模型氩弧等离子体的方法，先通过光束偏转法诊断出氩弧温度场的折射率，再借助计算机数值处理技术，迭代求出电子温度和气体温度。     

投影型莫尔条纹中的相移技术

提出一种使用偏振手段实现相移的方法，该方法应用于投影型莫尔术中的条纹判读过程，该方法的相移量可任意选择，易于自动控制．给出了理论分析和实验结果．     

使用莫尔条纹技术诊断不完全膨胀的三维气流场

应用莫尔条纹技术 ,测出了从不同喷嘴喷出的对称与非对称不完全膨胀气流的密度分布。给出了实验结果 ,并对该结果进行了分析 ,得到了几个重要的结论。最后 ,就系统的应用作了展望。     

使用莫尔条纹对冲击场气流密度的测试

文中用莫尔条纹法测出了射流冲击场的气流密度分布。实验表明，莫尔偏折图的条纹愈清晰，该段流场的燃烧愈充分，分析了马赫盘左右条纹清晰度差的原因并给出了几个有重要意义的结论。