Metal parts with highly dynamic areas often appear in industrial production measurements. However, if the traditional fringe projection technique is used to project fringe onto the surface of these metal parts, the light energy will be excessively concentrated and the image will be saturated, resulting thus in the loss of fringe information. To effectively address the high reflectivity problem of the object under test in fringe projection, background normalized Fourier transform contouring was combined with adaptive fringe projection in this work and a new method for performing highly dynamic 3D measurements was proposed. To reduce the number of the acquired images by the camera, a monochromatic fringe of different frequencies was put into the RGB channel to make color composite fringe, and then a color camera was used to acquire the deformed color composite fringe map. The images acquired by the color camera were then separated into three channels to obtain three deformed stripe maps. The crosstalk was also removed from these three images, and the 3D shape of the object was reconstructed by carrying out Fourier transform contouring with background normalization. From our experiments, it was demonstrated that the root mean square error of the proposed method can reach 0.191 mm, whereas, unlike the traditional methods, the developed method requires four images.

基于科学级CCD相机的多色光度测量技术凭借着实用性强、简单有效等特点在天文观测中受到了广泛应用。针对传统多色测光技术缺乏同时性这一问题，本文介绍了一种新型的同时性三通道测光系统，采用分色的设计方式实现了Sloan Digital Sky Survey （SDSS）测光标准g′，r′和i′三个波段分光。首先，利用Zemax软件对三通道光度计的光学系统进行了仿真分析，仿真结果显示该系统符合总体设计指标且能够满足使用要求。然后，为验证该系统的光学性能，我们针对大量SDSS标准星开展观测，实测结果表明该设备在g′，r′和i′三个通道的视场分别为21.5′×21.5′，21.5′×21.5′和21.3′×21.3′，系统效率分别为65.6%，68.3%和63.7%，将曝光时间归算为1 s、信噪比为5时，计算得出的极限探测星等分别为15.26，16.39和15.63。接下来可通过对系统的优化，进一步提高其极限星等的探测能力。