# Regulated Power Supply with High Power Factor for Hyperspectral Imaging Applications
## 3 Proposed Circuit Configuration
### Quality Assessment of the Lightning Systems for Hyperspectral Imaging
Each measurement involved capturing 500 frames at an exposure time of 40 ms using the VNIR (Visible and Near-Infrared) camera. There is no synchronization between the power sources and the imaging system. For this reason, we manually activated the power supply after about 50 frames during each experimental measurement to capture data from the transient light intensity. The experimental measurements were carried out at room temperature (approximately 25 \({}^{\circ}\)C), with each type of power supply being tested ten times to ensure consistency and reliability of the results. From the HS cube, different information can be extracted. Figure 9a,c show the mean information contained in the HS cube from the spatial and spectral dimensions. First, regarding the spatial information (horizontal axis), in Figure 9, it can be observed that the field of view (FOV) of the camera contains light since the white reference used for the reflectance experiment was larger than the FOV. However, that is not the case for the transmittance experiment, where the backlight illumination is smaller than the camera FOV. Therefore, there is no information about light in all the spatial coordinates of the transmittance experiment. This effect can be shown in Figure 9c, where the location of the backlight illumination is approximately contained in the spatial pixels from 250 to 850. Second, the temporal information can be observed in Figure 9b,d. This information was extracted as the mean light intensity of the entire spectral range within the HS cube. From these images, it can be observed that there are three regions. The first rows of the images represent the period when the light is still turned off. Then, once the light is turned on, there are a few rows representing the transition period (transient period) before the light is stabilized (steady period). In this steady period, the light intensity is high and homogeneous for the rest of the rows of the spatio-temporal profile. From the two-dimensional profiles shown in Figure 9, it is possible to extract some useful information for representing and measuring some features of the imaging system. We show this information in Figure 10. Firstly, the spectral information, where the light intensity is represented against the different wavelengths, is shown in Figure 10a,d for the reflectance and the transmittance setup, respectively. This information contains both the spectra of the emitting light as well as the spectral response of the instrumentation. Secondly, the mean light intensity for the different spatial pixels is shown. As mentioned before, in the reflectance experiments (Figure 10b), the light is homogeneous within the FOV of the camera. On the contrary, for the transmittance experiments (Figure 10e), the light is only present in the central pixels of the camera FOV (approximately from pixel 250 th to pixel 850 th). Thirdly, the evolution of the light intensity over time is represented in Figure 10c,f. From these representations, the different stages of our experiments are clearly visualized. In the first seconds of the experiments, the light is turned off (intensity around 0). Then, the light is turned on, and there is a transient period until the light is stabilized. Finally, in the steady period, light intensity is high and constant over time. Figure 9: Representation of the HS cube measured for the different illumination conditions reflectance mode and transmittance. (**a**) Pushbroom frame for reflectance illumination. (**b**) Temporal profile for reflectance illumination. (**c**) Pushbroom frame for transmittance illumination. (**d**) Temporal profile for transmittance illumination.