Fig. 1

Three orthographic views (top, front, and side) and 3D (isometric) view of the schematic of the sterilization unit is depicted to show the relative positions of different components. All the measurements are in centimetres. Images not to scale. The sterilization chamber (transparent maroon box with 1 cm thickness) is made of metal with a door (transparent cyan plate with 1 cm thickness containing small black knob) hinged at the front. The laser head (red cylinder) is mounted at the top corner such that it focuses the laser at an angle of 45°. One CCD camera (green square) is mounted at the top to capture the laser speckles. The CCD camera is connected to a computational system (not shown) where the image transfer and analysis takes place. Two UV lamps (blue rectangles) are mounted at the top and bottom face of the metal chamber. A glass base plate (maroon square with 3 cm thickness) is placed on the top of the UV lamp mounted at the bottom, where the items to be sterilized will be placed. All the views of the sterilizer unit are developed using the AutoCAD version 2018 (Autodesk Inc.)