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Two pairs of eyes are better than one – Laetus GmbH
Thursday, January 27th, 2011 @ 9:19:PM

Alsbach-Hähnlein, 12 January 2011.
In the new version of the POLYPHEM Laetus Colour Chamber system, two cameras instead of one guarantee higher precision in the blister test. This means that now, on tablets with a diameter of 5 millimetres, impurities of only 0.1 millimetres can already be detected.

This decisive increase in detection performance is achieved by two colour cameras, mounted side by side, which cover the same test area formerly covered by one single camera. Each of the two 5-megapixel cameras records half of the respective test area. These photographic recordings are then combined into one image, whereby the horizontal resolution of the complete photograph is doubled. An additional positive effect is that objects on the edge of the inspection area appear less distorted because the respective angle from the edge to the camera is less oblique.

Further sources of error are excluded by using surface-scan instead of line-scan cameras. This is due to the different photographic techniques. Line-scan cameras, triggered by incremental sensors, record single lines, which are then later combined to form an image of the area to be tested. In this, an optical offset effect my occur, so-called slippage, which, for example, causes round objects to appear oval in shape. In consequence, objects are wrongly classified as faulty and rejected. Optical distortions of this nature cannot occur when using a surface-scan camera, which records the entire area simultaneously.

Adjusting the cameras and setting them according to the respective production environment is extremely easy and convenient. All setting changes are immediately shown as an image on the display panel, which enables exact selection of the test area.

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