The co-axial light transmits light from the side onto a half way mirror. The mirror reflects the light onto the target. Specular reflected light is allowed to pass back up to the camera whereas as diffuse reflected light from the target is rejected. This in turn causes a contrast at the edge points of a target. In addition, the further the light is from the target the greater the rejection of diffused light becomes, creating greater image contrast and definition.
Edges are not clear as diffuse and specular light is received by the camera.
The recessed areas diffuse light so they appear dark and the edges can be easily identified.
Various light components are reflected at all angles causing inconsistent images from part to part.
The change from curved to flat is clearly identified and the flat area is highlighted well to the camera.
Marking is unclear.
The edges of the marking are clearly defined.
Specular reflection causes lights to appear on the glass surface
Uniform illumination is possible.
The above image displays the relative brightness across a 10000 point grid for the CA-DX Series. Although the intensity varies with each model type, the associated illumination distance and relative brightness across the area are consistent. The brightest areas (shown in red) are considered 100% relative intensity and the dullest areas (shown in green) are considered 0% relative intensity. The images display the intensity differential across the area. By comparing the changes in the intensity differential for different lighting heights (LWD) the ideal lighting range can be realized with the relative brightest points being 100%.
* The above data are representative examples. This is not a guarantee of the product quality.
* LWD is the distance from the illumination to the inspection target.