A parallel coaxial light source is a coaxial light source that emits collimated light. The light source is square and consists of a point light source paired with a Fresnel lens or convex lens, and a semi transparent and semi reflective splitter structure (splitter lens or splitter prism) at the front end.
Similar to standard coaxial light, the light is on the side, and the emitted light passes through a Fresnel lens and becomes collimated. This light passes through a specially coated spectroscope or prism, where half of the light passes through and is absorbed by the absorbing material, while the other half is reflected and shines on the surface of the measured object. After being reflected by the surface of the measured object, it passes through the lens and is imaged on the camera chip. According to actual needs, it can be designed in different sizes.
Compared to ordinary coaxial light, the structural characteristics of parallel coaxial light make their illumination more parallel and brighter than traditional light. They can also overcome some interference caused by reflection on the surface of objects, and highlight some uneven areas on the surface. They are suitable for detecting scratches, bumps, and other aspects of flat reflective objects.
