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Laser Point Sensors

The measuring principle of a laser point sensor is based on the projection of a beam of light produced by a laser (usually a laser diode) onto the object to be measured. The reflected beam spot is imaged on an […]

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Autofocus

The same hardware components are used for autofocus as for image processing. When the sensor is moved along the optical axis, a sharply defined image results only in a single position. If the sensor is defocused, blurred images are produced. […]

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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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