Perpustakaan Digital ITB

Nowadays, Particle Image Velocimetry (PIV) system has been developed and implemented extensively in many different areas in any institution throughout the world. The remarkable performance of capturing the image of instantaneous flow field and transforming it into a flow visualization has led many fluid mechanic scientists to understand the complex flow phenomena. Even so, this state of the art system still undergoes some limitations which only capable of recording the projection of 2-D flow displacements inside the plane of the luminous light sheet; though the out-of-plane (3-D) velocity component can be determined. However, these kinds of limitations have been solved by introducing a newer technique, the Stereoscopic Particle Image Velocimetry system. Generally, the Stereoscopic PIV only added some algorithm and hardware configurations to the previous PIV system in order to fulfill the task to measure and visualize the out-of-plane velocity components. Consequently, a fine calibration system has to be developed to guarantee the whole process to be carried out perfectly. The thesis discusses some fundamental principles of Stereoscopic PIV system, begins with different stereoscopic configurations that have been used, followed by the relative merits of reconstruction methods for recovering the 3-D displacement vectors. Next, a calibration code is developed to correct and minimize the perspective distortion caused by the stereo optical (camera and lens) configuration, imperfect of the experiment set up, and the distortion due the difference of bias index of the medium that passed by the light between the object plane and the camera sensor to In addition, to support the calibration need, to recover, as well as to reconstruct the out-of-plane velocity components, a new approach i.e. three dimensional reconstruction method is implemented. Subsequently, the calibration procedure was noted and illustrated from top to bottom, in order to give a deep perception of how important the procedure is for the whole Stereoscopic PIV system. Finally, experiments followed by the error estimation are conducted to ensure that all calibration systems could be applied.