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Contact image sensor (CIS) technology from Stemmer Imaging offers an alternative to conventional line-scan cameras for industrial web applications, such as the inspection of paper, textiles or glass.

According to the company, which will exhibit the technology on Stand 1530 at VTX, which will be held at the NEC in Birmingham, CISs offer advantages in terms of space requirements, ease of alignment and resolution.

With line rates up to 100kHz, scanning widths of up to 4m, high resolutions and integral light sources, a CIS can be a cost-effective choice in certain applications.

The CIS head consists of a lens array using graded rod lenses, with each individual lens capturing an image of a very small section of the target object.

There are various resolution options available, from 25dpi up to 3,600dpi, with pixels sizes of 1mm down to 7um.

A clear, sharp image is produced along the narrow line of the sensor ‘head’, which is made up of silicon photodiodes using either charged-coupled-device (CCD) or CMOS technology.

CISs feature a flat construction so they fit into narrow spaces.

They come as a system complete with optics, illumination and encoder logic and can be joined together to suit the resolution and width of the web, with no reduction of line rate as the width increases.

This provides a consistent viewing angle, sharpness and brightness across the width.

Integral light-emitting-diode line lights are pulsed to offer long operating lifetimes and to enhance image quality.

Built-in timer control includes encoder inputs for triggering and light control and is configured via RS232 or Ethernet.

Signal processing enables high data rates, independent of the scanning width.

The interface to the image processing system is via industry-standard Cameralink or Gigabit Ethernet.

CISs operate with a fixed working distance (typically around 10mm) and a depth of field of around 2-3mm.

As such, they are suitable for inspecting very flat objects where there is no vertical movement of the object at the point of inspection.

STEMMER IMAGING is Europe’s largest imaging technology provider with headquarters in Germany and subsidiaries in the United Kingdom, France and Switzerland.

Image processing or Machine Vision is used in many different application areas – such as industrial automation, medical imaging, security and traffic technology – as a powerful and cost effective way of implementing automatic quality assurance. Even at high speeds and with stringent accuracy requirements, image processing allows 100% monitoring and thus strengthens the competitive edge of those companies using it.

STEMMER IMAGING customers have access to a wide variety of imaging products from the worlds leading manufacturers. These manufacturers represent the cutting edge of vision technology which is something that is unique in Europe. STEMMER IMAGING are the developers of the world’s leading image processing software platform, Common Vision Blox, and as a manufacturer of customer-specific products, we have a full range of in-house expertise to draw on, allowing us to supply the best possible service to our customers when choosing an imaging solution. STEMMER IMAGING does not produce turn-key solutions – instead, using our close partnerships with a large number of experienced system integrators, we can provide expert technical know-how for the planning, integration and realisation of complete solutions.

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