频谱扫描的物体面形测量方法研究

根据正弦投影栅成像及其傅里叶变换的特点，提出了一种利用频谱扫描测量物体面形的方法．使用CCD摄像机采集一幅待测物面的图像，利用傅里叶变换法求出其空间频谱．扫描频谱图，确定参考平面投影栅线的空间频率，进而利用余弦函数模拟参考平面上的投影栅线分布．由待测物面上和参考平面上投影栅线的相对变形可求出物体的高度场分布．该方法不需要相位分布测量，也不需要解包裹运算，只需一幅图像即可实现物体的面形测量．笔者介绍了该方法的原理并进行了实验验证，给出了实验过程和实验结果．实验结果表明，该方法可实现物体面形的快速识别，有自动化程度高、计算速度快、对环境要求更低的优点．

RESEARCH ON SHAPE MEASUREMENT WITH FREQUENCY SPECTRUM SCANNING

Based on the imaging characteristics of Sinusoidal Grating Projection and its frequency spectrum, a new shape measurement method is presented. A deformed fringe pattern on object plane is captured by a CCD. The frequency spectrum pattern of the deformed fringe pattern can be obtained by using Fourier Transform Method. Then the frequency on reference plane can be obtained by scanning the spectrum pattern. And then a reference fringe pattern is simulated using cosine function as spatial frequency and initial phase understood. The shape of the object can be calculated by means of the relationship between the deformed fringes and the reference fringes. No need to compute the phase distribution and phase unwrapping algorithm, shape measurement is realized only by one deformed fringe pattern. indicate that this method environment. Experimental principle and process are introduced in this paper. can measure the shape of the object fast and automatically and has Experimental results a lower demand for