Measuring 3D profile and position of a moving object in large measurement range by using tracking fringe pattern

The profile and position of a moving object have been measured by using a t racking fringe pattern. The 3D profile of the object is determined from the distorted fringes, and the absolute coordinate is determined from the angl e of the reference-tracking fringes. This method enables us to track a movi ng object, and measure it with high resolution in a large measurement range . Moreover, the tracking feedback signal is obtained from the image taken b y CCD camera, ensuring the system with good sensitivity, reliability and co mpact. We have successfully used the method to track a swimming fish and me asure the position and body deformation of it. (C) 2001 Elsevier Science B. V. All rights reserved.