Illumination, Back
Lighting applied from the back of the object so as to create a silhouette when the object is viewed by the camera.
Magnification, Lens In a vision metrology system, the image size in the CCD plane divided by the corresponding object size. Magnification, Image Image size on the video monitor divided by the corresponding object size. Same as lens magnification in a properly adjusted vision metrology system. Pixel A picture element. Term used to describe the individual light detectors of a CCD sensor and the individual light emitters of a video monitor. The spacing and number of pixels determines the resolution of a video metrology system.
Parcentricity
The condition where a feature remains at the optical center of the video Image throughout the magnification range of zoom optics. The condition where the video image remains in focus as the magnification is adjusted from highest to lowest with zoom optics. A picture element. Term used to describe the individual light detectors Of the CCD sensor in the camera and also the individual light emitters of An LCD video monitor. The least significant digit to which a physical quantity can be read. High resolution does not guarantee high accuracy. A ring-shaped light source which illuminates the object from the top with even illumination from all sides. Quad Dark Field. Term used with an optional height-adjustable ring light, where LED intensity is individually adjustable in four quadrants. These adjustments are used for shadow control. A ring-shaped light source where quadrants of LEDs can be individually controlled. This produces illumination from the top and from the sides, with individually adjustable lighting and shadows from the sides. Further control of lighting and shadows from the sides is provided by height adjustment of the quad ring light at the bottom of the video probe to a point 100 mm (or 4”) lower. In AV300 and AV350 systems, the height adjustment is motorized using the system’s Z-Track lead screw feature. Misalignment of the part with respect to the X and Y axes. This will create measurement errors unless the part is repositioned or the deskew feature of the metrology software redefines the measurement axes. The alignment of the camera relative to the motion of the metrology stage. If the camera is misaligned (out of square), the image will drift diagonally as the stage position is moved along one axis. A light source located below the glass platen of the X-Y stage for silhouette or back illumination. A lens property where the light from the object stays parallel to the optical axis across the entire field of view, thereby eliminating optical distortion. This can only happen if the entrance aperture of the lens is larger than the field of view, requiring a large and high quality lens.
Parfocality
Pixel
Resolution
Ring Light
QDF
Quad Ring Light
Skew
Squareness
Substage Light
Telecentric
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