The numerical aperture is a measure of the acceptance angle of the fiber. It is very important because it determines how strongly a fiber guides light, and so how resistant it is to bend-induced losses.

Correcting production line defects: In addition to using machine vision to identify defective products, machine vision can help determine where the problems are being introduced in a production line so corrective action can be taken.

Industrial machinevision

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It is most convenient to define the NA in terms of the relative indices of core and cladding glass forming the fiber waveguide:

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Inventory control and management: Machine vision is imperative in the process of reading barcodes and labels on components and products. This has important applications for inventory control, but also in the manufacturing process to ensure the correct components get added as products move down an assembly line. Machine vision is critical for the bin-picking done in warehouses by robots.

The process begins when a sensor detects the presence of a product. The sensor then triggers a light source to illuminate the area and a camera to capture an image of the product or a component of the product. The frame-grabber (a digitizing device) translates the camera’s image into digital output. The digital file is saved on a computer so it can be analyzed by the system software. The software compares the file against a set of predetermined criteria to identify defects. If a defect is identified, the product will fail inspection.

Measurements and calibration: Whether measuring the gap in a spark plug to ensure it fits specifications or identifying a gauge that needs calibrated, machine vision automates and makes the process quite efficient.

Product tracking and traceability: In heavily regulated industries such as pharmaceuticals, it’s important to be able to track ingredients, product serial numbers and monitor expiration dates which machine vision makes extraordinarily easier.

Cognex

Related Terms: Bend Edge, Bend Induced Loss, Cladding, Core , Mode Field Diameter (MFD), Refractive Index, Refractive Index Profile (RIP), V-Value

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In addition to using machine vision for quality control purposes, it is helping businesses in many ways today for identification, inspection, guidance and more. Here are a few examples:

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Numerical aperture can be defined by the acceptance angle of the fiber, though as this is highly diverging in space it is rather complicated to reach a simple definition.

Let’s look at how these components work together when machine vision is used to inspect a product in a manufacturing operation, a very common example of a machine vision system in practice.

Farming: Machine vision is used by harvesting machines to detect the location of grapes on the vine so that robotic harvesting machines can pick the bunches without destroying any grapes. Machine vision is also used as part of farm machinery to monitor crops and detect diseases on plants.

b) it will still guide a single-mode when coiled or bent to a smaller diameter than is possible with a ‘low’ numerical aperture fiber.

One of the simplest ways to understand a machine vision system is to consider it the “eyes” of a machine. The system uses digital input that’s captured by a camera to determine action. Businesses use machine vision systems in a variety of ways to improve quality, efficiency and operations.

VisionMachine Inc

Some manufacturing facilities have used machine vision systems since the 1950s, but it was in the 1980s-1990s when things really started to expand. Regardless of an industrial or non-industrial application, a combination of software and hardware work together to make machine vision systems possible. Here are the typical components involved:

NA may also be approximated as (2ncore.δn)½ where δn is the index difference between the core and cladding. An optical fiber with ‘high’ numerical aperture will confine light more strongly in the core, and so support guidance further above cut-off. This attribute has two important effects:

An imaging lens is also known as a machine vision lens, objective lens or objective, or just simply as a lens.

a) it will be single-mode over a greater range of wavelengths than is possible with a fiber with a ‘low’ numerical aperture fiber.

Computer vision and machine vision are overlapping technologies. A machine vision system requires a computer and specific software to operate while computer vision doesn’t need to be integrated with a machine. Computer vision can, for example, analyze digital online images or videos as well as “images” from motion detectors, infrared sensors or other sources, not just a photo or video. Machine vision is a sub-category of computer vision.

Safety: Whether on a construction site with heavy equipment or tracking food supplies, machine vision can improve safety with great efficiency.