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Illumination for Visual Sensors – 2

The use of visual sensors usually requires reflected-light as well as transmitted-light illumination. A distinction must be made here between two types: bright field reflected light is projected onto the object parallel to the axis of the beam path. Ideally, this […]

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Illumination for Visual Sensors – 1

The basis for every optical measurement is to display the features being measured with a highly accentuated contrast. This can best be achieved on the outer edges of objects. In this case, measurement can be performed in transmitted light (Fig. […]

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Visual Sensors – Image Processing Sensor – 3

Today, digitization of images is usually achieved using CCD cameras in conjunction with PC components suitable for image acquisition (framegrabber boards, firewire interfaces, etc.). The chief advantage offered by the CCD camera over the competing CMOS chip lies in its […]

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Visual Sensors – Image Processing Sensor – 2

The lowest measuring uncertainty can be achieved using telecentric lens systems. The advantage of telecentrics is that the lateral magnification remains constant when the working distance is altered within the telecentric range, thus preventing errors of dimension. This is especially […]

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Visual Sensors – Image Processing Sensor – 1

Today, image processing sensors are commonly used as visual sensors (Fig. 8). The object is imaged onto a matrix camera by the lens. The camera electronics convert the optical signal to a digital image, which is then used to calculate […]

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