Determination method on geomoetrical arrangement of optical equipments and selection of photographic parameters are shown for construction of Visual Sensing System.
Incident angle of laser spot light from laser project to the surface of object-hot rolled steel sheet- is neccesarry to be selected as more different degree more than 15° from observatory angle, from the viewpoint of decreasing the intensity variation of laser scattered light by variation of angle.
Laser scattered light with little variation in space and time and high intensity is required for improving the detection limit for root gap information, and so, both laser diameter and size of surface on the object equivalent to I pixel at picture in camera are very important parameters for it. Furthermore, optimum vale of F-number at lense in camera exists and depends on the surface properties of the object and the intensity of laser light.
