频移阴影莫尔法

提出了一种新的莫尔条纹解调技术即频移法，它改变了莫尔条纹分布的频率，而相移莫尔法只是改变了莫尔条纹的相位。从阴影莫尔图分布的基本公式出发，借助于相移阴影莫尔法的思想推导并得出了频移阴影莫尔法的公式，在此基础上给出了特定条件下的产和公式。

The Frequency Shifting Technology in Shadow Moire

A new method is presented to extract quantitative information of Moire fringes. It is different from the method of phase shift. Instead of changing the phase of Moire fringe, it changes the frequency of the Moire fringe. The theoretical formula is introduced for a special relationship of three frequencies. For unwrapping the phase image, the first step is to expend the cosine value range from (0, π) to (0, 2π) to avoid the indetermination of “plus” or “minus”. The experimental result is given and the effect of light source position on measuring results are discussed.