Inspection of specular materials is challenging for conventional imaging systems since their shiny surfaces create a hotspot glare, confusing machine vision software and making it impossible to reliably detect texture and topology defects. To solve this problem, Chromasens has expanded its 3DPIXA family of 3D linescan cameras with a new dual model featuring 70µm optical resolution for fast, precise 3D measurements of specular materials. Coupled with the Chromasens Corona II dark field linescan light, the 3DPIXA dual 70µm camera allows defects down to a depth of just a few micrometres to be located and classified quickly, reliably and free of interference – even on products with coated or polished surfaces. Both devices facilitate rapid development and easy integration, and are rugged enuogh to withstand harsh industrial environments.
“For the manufacturer, our new camera eliminates the need for additional manual checks further downstream in the process which is typical for specular materials. Plus, it helps to keep volumes of scrap at a minimal level,” said Martin Hund, CEO of Chromasens. “Being 3D, it offers many advantages over a standard 2D view. For example, a 2D camera only sees a PCB from the top, while the 3DPIXA can identify whether components are flat on the board or the volume of solder paste. Chromasens is making 3D vision as convenient as 2D as an inspection tool – with far better outcomes.”
High-resolution 3D images. The new 3DPIXA dual 70µm is a combination of linescan technology and fast stereo algorithms running on GPU. Providing both 3D data and 2D colour images, it leverages a trilinear CCD line sensor (RGB) for performance characterized by minimal noise levels, high image contrast and low power consumption. Due to its unique opto-mechanical design and the special trilinear line sensor with precise internal synchronization, the camera consistently delivers excellent image quality in scan widths up to 500 mm (19.68 inches) at a maximum speed of 1.4 metres (4.6 feet) per second. Supported machine vision libraries and the Chromasens 3D-API make it easy to integrate 3D 100% inspection into fast-paced automated manufacturing, the OEM added.
Powerful 3.5M Lux Light. Chromasens recommends coupling the 3DPIXA dual 70µm with its Corona II dark field linescan light which maintains optimum light to drive the camera within its full dynamic range. Imperfections such as scratches, edges, imprints or notches reflect light back to the camera making these surface features appear bright, while the rest of the surface is dark. The Corona II uses a patented technology that focuses LEDs by using elliptical reflectors instead of lenses, resulting in “perfectly-shaped light without chromatic aberations” up to an industry-leading 3.5 million Lux brightness. The Corona II is fully modular for customization and offers four focal types to cover a gamut of working distances.
Founded in 2004 as a former division of Siemens AG, Chromasens GmbH designs, develops and produces image-capturing and processing systems, assuring that the optical, electronic and mechanical elements of its cameras and illumination systems are adapted to suit the specific tasks faced by each individual customer. The company is based in Constance, Germany, and is ISO 9001 certified.