ZUT : Zernike Ultrasonic Tomography
Résumé
Developed in 2014 at the GIPSA-lab research laboratory, the ZUT (Zernike Ultrasonic Tomography) software proposes an ultrasonic tomography reconstruction method for pipeline flow field imaging, based on Zernike polynomial series. Having available multipath time-of-flight ultrasonic measurements at the input, it provides at the output tomograms of the fluid velocity components (axial, radial and orthoradial velocity). By representing these velocities as Zernike polynomial series, ZUT reduces the tomography problem to an ill-posed problem of finding the coefficients of the series, relying on the acquired ultrasonic measurements. Thereupon, this problem is treated by applying comparatively the Tikhonov regularization and the Quadratically constrained l1 minimization. In order to enhance the comparative analysis, we additionally introduce sparsity, by employing the SVD based filtering in selecting Zernike polynomials which are to be included in the series.