Line Modules

Line Modules_PatternsLine Modules are a specialized type of laser, designed primarily for various types of alignment applications. Machine Vision, a generic term for a broad group of applications, can utilize a variety of schemes for image detection and analysis. Lighting can influence that analysis and lasers are often used to illuminate objects with structured illumination. This can be useful in providing additional information about the objects through image processing. Examples of information that can be obtained include defects, location, dimensions, dents, punctures, and alignment, for example.

When compared to traditional light sources, lasers provide a much higher contrast with the background image providing the computer algorithm with a more precise reference source.   As a result, lasers have been widely deployed as structured lighting in many image processing systems.  Machine vision line module lasers are typically beam shaped into lines, dots, and other geometric patterns (such as crosses, circles, and grids) and they can come in a wide variety of wavelengths and powers depending on the systems requirements.   Each of these geometries has its own unique advantages, but lines tend to be the most commonly used laser shape in modern machine vision technology.  Lines are the most popular because if the laser is offset at an angle from the camera, a 3-dimensional image of the object can be reconstructed through a process known as triangulation.

When specifying line modules, the designer needs to understand the required line length, line width or thickness, the distance from laser to object, and whether intensity distribution across the line needs to be uniform. Line length is usually specified as fan angle and can be set to anywhere between 10 and 90 degrees. The line length can be calculated once you know the fan angle and the distance from laser to object. Line width and line thickness can be varied by adjusting the focusing optics. These can be pre-set by the manufacturer for a given object distance or controlled by the customer. You should specify if line module adjustability is an important feature .

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RHAML Series

The RHAML series of diode laser modules deliver a uniform, stable output beam that crucual for machine vision applcations, especially in 3D vision systems. The compact, RHAML series is a reliable light source that incoroporates a fucusing lens that can be easily adjusted by the user. Additionally, the RHAML series is fully IP67 compliant, making it an ideal solution for use in harsh environmental conditions and production/industrial facilities.

RML Series

The RML series of laser diode modules are available with single mode fiber outputs with a set wavelength from 405nm – 2500nm. The compact RML series is available with up to 80mW of output power in a package measuring 15mm in diameter and 40mm in length (without connector) . As an option these modules are offered with a potentiometer for power adjustment, external TTL modulation up to 1MHz and analog modulation up to 100kHz.