## 4 Results
Figure 11: Unwrapped phase of interferogram between five minutes after the beginning of the experiment and five minutes later on sample n\({}^{\circ}\)44 with (**a**) FORTH software, (**b**) CPULSI algorithm without denoising \(\text{ite}_{\text{Max}}\)300e0.001, (**c**) PULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.001, (**d**) CPULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.001, (**e**) CPULSI algorithm applied on denoised interferogram \(\text{ite}_{\text{Max}}\)600e0.001 and (**f**) CPULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.0001. Figure 10: The unwrapped phase of interferogram between the beginning of the experiment and five minutes later of experiment on sample n\({}^{\circ}\)51 with (**a**) FORTH software, (**b**) CPULSI algorithm without denoising \(\text{ite}_{\text{Max}}\)300e0.001, (**c**) PULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.001, (**d**) CPULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.001, (**e**) CPULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)600e0.001 and (**f**) CPULSI algorithm applied on denoised interferogram with \(\text{ite}_{\text{Max}}\)300e0.0001. These images need to be unwrapped to obtain a displacement of the surface. Figure 10 image (a) and Figure 11 image (a) are obtained with FORTH software [7]. The result of our interferogram unwrapped without denoising is shown in Figure 10 image (b) and Figure 11 image (b) obtained with the CPULSI algorithm with a suitable limit of iterations at 300 and an error to reach 0.001 (ite\({}_{\text{Max}}\)300e0.001). The computing time is on average for the processing of 40 images, 41 s by image. The maximum and minimum phases are reversed concerning the images obtained by FORTH. The PULSI algorithm results on our images are presented in Figure 10 image (c) and Figure 11 image (c) with ite\({}_{\text{Max}}\)300e0.001, the computing time is on average 0.51 s. The phases maximum and minimum are in correlation with FORTH results. The images (d) of Figures 10 and 11 are obtained with the CPULSI algorithm with ite\({}_{\text{Max}}\)300e0.001. The computing time is on average 28.41 s. The computing time is shorter when denoised algorithms are used and the images are less noisy. Figure 10 image (d) and Figure 11 image (d) is obtained with the CPULSI algorithm with ite\({}_{\text{Max}}\)600e0.001. The computing time is 45.71s, it is increased and there is not a visible improvement from the number of iterations of 300. Indeed, for some unwrapped phases, the error was reached with less than 300 iterations as in Figure 10 images (d) and (e) that are the same. Nevertheless, Figure 11 images (e) and (f) are different because the 300 iterations were reached and not the error. Figures 10 and 11 have inputs of ite\({}_{\text{Max}}\)300e0.0001. Figure 11 images (e) and (f) are the same because the error of 0.001 was not reached with 300 iterations, a smaller error cannot be reached without any more iterations, and the computing time is 30.65 s. The CPULSI inputs chosen for our experiment is 300 maximum iterations for an error to reach 0.001. The inputs of the function depend on the denoised interferogram. Indeed, Figure 10 is the unwrapped phase of Figure 9 image (a) that has fewer fringes than Figure 9 image (e), they are the chosen denoised images of mock-up n\({}^{\circ}\)51 and mock-up n\({}^{\circ}\)44 respectively to be unwrapped with CPULSI algorithm. To unwrap these two different images, the error to reach is set to 0.001 and the number of iterations is equal to 300. Figure 9 image (a) unwrapping ends because the error 0.001 is reached, contrary to the unwrapping of Figure 9 image (e) which unwrapping ends because the 300 iterations are reached.