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LED Coaxial Lights- Imaging Highly Reflective Objects

LED Coaxial Lights- Imaging Highly Reflective Objects

Led Coaxial Light source provides a type of diffuse illumination created from an internal source. This illumination type is to apply a sheet to the object and collect how the light is reflected, scattered, or absorbed. It allows the light to deflect downward onto the imaging plane through a 50% beamsplitter. Also, enable the light from the object to be collected by the camera above.  It is suitable and ideal for imaging highly reflective objects or where shadows from its surroundings obscure the inspection area.

People often struggle while underestimating the power of proper illumination with contrast and resolution problems in an imaging system. System integrators should remember that appropriate light intensity in the final image is directly reliant upon component selection. So, to get the desired image quality you can improve a system’s illumination rather than investing in higher resolution imaging lenses, detectors, and software.

It is essential to use the correct led coaxial lights source in an imaging system as improper illumination can have variety of image problems. Moreover, there are different types of illuminations. For example, they help in blooming or hot spots, which allows hiding image information. In addition, shadowing can also cause untruthful edge calculations when calculating, causing inaccurate measurements.

So, let’s look upon different types of illuminations and find out how they are beneficial.

Types of illuminations

Directional Illumination

It is an ideal source of illumination from single or multiple sources. They use lenses that help to focus or spread out illumination. They help focus assemblies, Fiber optic light guides, LED spotlights, and incandescent light. Mostly applicable for inspection and measurement of matte and flat objects.

Pros- It is flexible, bright, beneficial for various applications, and easily fitted into different packaging.

Cons-Shadowing and glare.


It is used to silhouette opaque objects as it helps the thing be lit from behind.  Also, they are helpful for imaging through transparent objects. The valuable products of these types of illumination are Fiber optic backlights and LED backlights.

Moreover, they are applicable in numerous applications like edge detection, targets and test patterns, measurement of opaque objects, and sorting of translucent colored objects

Pros– they are high contrast for edge detection.

Cons– it eliminates surface detail.


It allows the light to enter a transparent or translucent object with the help of the edges perpendicular to the lens. Useful Products of this type of illumination are light line guides, fiber optic darkfield attachment, and laser line generators. They are used for glass and plastic inspection

Pros– they are High contrast of internal and surface details. It also enhances cracks, scratches, and bubbles in transparent objects.

Cons– it has poor edge contrast and is not valid for opaque objects.

Polarized Light

It is a type of directional illumination that uses polarized light to eliminate specularities and hot spots. Useful Products of this illumination are Polarization filters and Polarizer/ Analyzer adapters. People use it for measurements and inspection of shiny objects

Pros- it offers even illumination over the whole surface of the object under polarization. Decreases glare to make surface features discernable.

Cons- after the polarization filter is placed overall intensity of light is reduced in front of the light source and imaging lens.

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