Anzeige

Multi-Channel-Flash

Four Different Types of Illuminations in a Single Scan

Different allPixa cameras can be used to trigger up to four different flash controller channels synchronized to its line acquisition. This can be used to acquire several images with different illumination geometries (dark field, bright field, or backlight, co-axial) and/or colors (white, red, green, UV, IR) simultaneously in only one scan by line-multiplexing.

Figure: Chromasens GmbHFigure: Chromasens GmbH
Figure 1 | Flash mode acquisition of metal sample with two different illumination geometries. Left: raw camera output. Right: Separated individual images with color plane correction.

This means multi-channel flashing enables the system to scan the object using with up to four different type of illuminations in a single scan. Various types of defects are possible to be captured with this kind of vision system.

Bild: Chromasens GmbHBild: Chromasens GmbH
Figure 3 | HDR demonstration on ball grid array sample. Left: Interlaced image. Middle: Separated images with different exposure times. Right: HDR image.

Examples are cracks, scratches, stains, chipping, etc. The multi-channel flash control feature of the cameras can acquire multiple images, whereas every image is recorded under different illumination conditions in a single scan. In addition, high color fidelity and a high dynamic range help to achieve excellent results in defect detection. The high-quality color images can give more information about the defect class and extent of the defects on the object. The large full well capacity of the sensor enables a high dynamic range and the blooming resistance is outstanding, which is very import for strong local reflections in bright field configuration.

Chromasens GmbH

Dieser Artikel erschien in inViSION 5 (Oktober) 2020 - 28.10.20.
Für weitere Artikel besuchen Sie www.invision-news.de