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NEWS@IMAGING

Always one step ahead

Revolutionary 4-CCD Colour Linescan Camera Adds NIR Imaging To RGB Capability

27 Jul 2010

STEMMER IMAGING can now offer the novel LQ-200 CL prism-based 4-CCD colour linescan camera from JAI. Already well known for 3-CCD colour linescan cameras such as the CV-L108 CL, JAI has added a 4th channel to provide NIR imaging. Capable of simultaneous imaging of NIR, red, blue and green light through 4 independent channels but the same optical path, the innovative LQ-200 CL enables identification of an even wider set of defects (including sub-surface imaging) on inspected objects. It can be used in a host of different industries.

NIR imaging allows features below the surface of an object to be viewed, thus providing different information to the RGB channels and revealing imperfections that the human eye cannot see. Linescan applications include: fruit and vegetable sorting, food inspection, web inspection (wood, textile, paper, glass), tiles inspection, 2D and 3D print inspection, surface inspection of flat panels/displays and PCB inspection.

The camera’s unique dichroic prism-block technology splits the incoming light into the 4 non-overlapping spectral band onto 4 separate CCD sensors with perfect pixel to pixel alignment, ensuring that the R, G, B and NIR pixels see exactly the same point on the object at all times. This produces high quality and perfectly aligned line scan images independent of the viewing angle to the inspected object, independent of variations on conveyer belt speed and independent of whether the object has a wavy or curved texture. This precise image alignment and colour registration makes inspection systems featuring these cameras faster and easier for end-users to setup, calibrate and maintain.

Each of the four CCD sensors provides 2048 linear pixels with a pixel size of 14 ?m x 14 ?m square. The camera runs at a maximum scan rate of 19048 lines per second with a 40 MHz pixel clock, delivering a high signal-to-noise ratio of 58dB. Built-in pre-processing functions include flat-field correction and gamma/gain correction, which, together with the electronic shutter can be set individually for the red, blue, green and NIR channels. The gamma/gain correction function also allows full advantage to be taken of the sensors’ dynamic range to optimize the image.

JAI

Kopenhagen, Denmark

For more than 50 years JAI has delivered industrial CCD and CMOS cameras with innovative engineering, high-end quality, and operational reliability and durability.