Applications and advantages of using the light sources (Product: Ring Light)

Applications and advantages of using the light sources (Product: Ring Light)

2022-07-07 23:48:44

One of the most significant components of machine vision applications is lighting. Information and productivity might be lost if a target is not appropriately illuminated. An illumination technique requires a light source and its positioning in terms of the component and the camera. A machine vision is considered blind without proper illumination. Inefficient lighting solutions can cost enormous sums of money in the long run, both in terms of energy consumption and maintenance replacements. The lack of higher-quality illumination is problematic. Even if the image processing software and the camera are outstanding, the intended inspection result cannot be produced until the brightness or light information of the inspection target is precisely captured by the camera. Here’s why SmartMoreInside light sources are superior to other lighting technologies.

Ring Lights for Machine Vision

For uniformly illuminating things, ring lights are frequently employed to provide darkfield, diffused, or directed lighting. Placing it approximately parallel to the camera can considerably lessen shadows.

SmartMoreInside ring light source is formed by an array of LEDs through optimized structure design, with stable performance and easy installation. Directly irradiating the measured object with various angles and color combinations can avoid shadows and highlight the imaging characteristics. It can also be used in combination with a diffuser to make the light more uniform and softer. It is one of the most widely used light sources in machine vision. This industrial ring lighting is appropriate for uniformly illuminating working distances of various sizes. They are adaptable to many applications and provide solutions thanks to their modular design and wide selection of light colors.

Illumination Methods Using Ring Lights

Depending on the operating distance, one of these illumination techniques most frequently uses machine vision ring lights (WD).

Diffuse Dome/Ring Lighting

Light is dispersed via diffuse lighting techniques to lessen glare on reflecting surfaces. All directional lighting (bar, dome, and ring) may use this method to produce a more even distribution of light across the target. With the use of on-axis directional lights like ring lights, this lighting method can aid to lessen lighting noise like glare and hotspots.

Low Angle Dark Field Lighting

The target is illuminated using a low-angle dark field illumination method at a very shallow angle (10–15 degrees). Dust, scuffs, and even fingerprints on a mirror surface will reflect light back to the camera, making these surface characteristics appear bright while the rest of the surface remains dark. For surface examination on glossy, highly reflecting surfaces, this illumination approach is very useful. Any height variations on the surface can be distinguished.

Brightfield for Medium WD

Without any additional equipment, the SmartMoreInside ring light produces a very bright, extremely diffuse light that is ideal for matte surfaces and quickly moving objects.

Brightfield for Large WD

SmartMoreInside ring light produces a brightfield across a wide working distance since it generates light with a high lighting intensity. The Ring Lights O2 Series are ideal for long working distance illumination applications, such as inspection for PCB, electronic components, IC components, plastic containers, etc.


SmartMore ring light series is an extensive portfolio of LED illuminators designed for various applications. It can be used in the automation industry such as microscope illumination, surface inspection, electronic components detection, integrated circuits recognition, and PCB & plastic container inspection. For detection scenarios that are difficult to observe, such as the detection of scars on the wafer, the reading of engraved words, and the extraction of workpiece edge contour, a ring light source is the best choice. The illuminating light of a ring light has strong expressive force on the surface concavity and convexity, allowing the machine system to detect inspection and proceed to accurate measurement eventually.

SmartMore Inside ring lights can also be used for object testing in pharmaceutical, 3C, electronic parts, FMCG, and many more industries. Some Common applications scenarios are given below:

  • Machine vision.
  • Label identification.
  • Direct part marking identification.
  • Surface inspection and finishes.
  • Microscopic stage illumination.
  • Solder joint inspection.
  • Components identification.
  • Molded part features.
  • Close-up, near-shadowless single light illumination applications

Figure 1 The 2D dot peen matrix code on the left is illuminated by bright field ring light. The right is imaged with a low angle linear dark field light. A simple change in light pattern creates a more effective and robust inspection

Figure 2 (a) Coaxial ring light without polarizers. (b) Coaxial ring light with polarizers (note some residual glare). (c) Off-axis (light axis parallel to the sample long axis) ring light without polarizers. (d) Coaxial ring light without polarizers. (e) Coaxial ring light with polarizers


  • Irradiation at various angles: use ultra-high brightness LED for high-density installation, and provide red, green, blue, white, infrared, ultraviolet, and other colors.
  • At a certain working distance, the beam concentration has high brightness, good uniformity, and a relatively small irradiation area.
  • It is used for plastic container inspection, workpiece screw hole positioning, label detection, pin, integrated circuit print detection, and other similar purposes.
  • For character shape recognition and defect detection.
  • Shadowless: use ultra-high brightness LED for vertical light irradiation, and provide red, green, blue, white, infrared, ultraviolet, and other colors.
  • Diffuse secondary light source, with uniform illumination and no shadow effect, has an outstanding detection effect on the metal surface when detecting the scars on mirror reflectors such as wafers or glass substrates.


Light sources can be used in many ways to enhance the vision system. The productivity of a machine can be significantly increased by selecting the correct lighting. When designing a new automated inspection system, the first step is to comprehend the part that will be examined, including what will be learned from inspecting it, its surface finish, color, etc. Understanding the production environment is also essential. analyze the advantages and disadvantages of the various light sources. The next choice is where to put the light source for maximum efficacy after choosing the appropriate lighting. To guarantee that high-quality, consistent images are captured to match the application's inspection criteria, it is important to consider how the illumination source is located with respect to the part and how it interacts with the camera. Click here for more information about light sources!


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