LED Lighting Applications in Machine Vision

Intricate and meticulous tasks, such as machining in industrial work sites, require special LED lighting fixtures for processing and accurate detection of colors.

For operators, it is top priority to select an LED light that can help produce high-quality images, resulting in consistent output on the floor. This is easier said than done, however, as most markings are extremely small or undistinguishable.

Types of Machine Vision Lights

LEDs for machining vary greatly, depending on their applications. A type of LED lamp that is used frequently for machining is a ring light. The luminary is low cost and can be used for diffused illumination or specular surface reading.

An LED backlight functions roughly the same way as an LED ring light. However, the compact fixture is primarily utilized for measuring external dimensions and viewing openings around the object.

For inspecting flat surfaces and labels, a diffuse on-axis light (DOAL) can be used. This luminary is installed on the side of the machine and leverages beam splitters and reflectors to ensure even illumination.

Object or packages with thick wrappers make it difficult for operators to detect barcodes and serial numbers on the surface. To address such concerns, a more powerful beam, UV illumination or infrared lighting can be applied.

LED Chips and Colors

Modern LED chip designs allow businesses in the industrial sector to incorporate lighting in tight spaces. COB LEDs are an example of a cutting-edge LED chipset that is made up of a group of LED chip diodes on a circuit board. This robust configuration promotes active thermal management. Up to 25 percent less heat is emitted when using this type of LED chip.

Selecting the right colors may also be beneficial for active detection of labels and barcodes. Some selections, such as red or blue, cause surfaces and textures to appear bolder.

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