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The Engineering Toolbar
The Ultimate Resource for Engineering and Technical Research. (Learn More) |
Manipulating Distortion Out of Your Image
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From Edmund Optics Inc.
Precise measurements of plastic mesh fencing are needed during production runs to ensure that all dimensions fall within the specified tolerances. In this situation, the space reserved for the imaging system is extremely limited. The housing for the CCD and lens is integrated into the mounting of the machinery. Although their minimum working distance is longer than desired, the MVO® Micro Video lenses are compact, making them ideal for this application. The 4.3mm focal length MVO® Micro Video lens has a 60° angular field of view under normal conditions. By introducing 0.25mm of space between the lens and the camera, the horizontal field of view is reduced to 50mm at a 50mm working distance. A high resolution monochrome board camera offers the appropriate resolution and size. The illumination is provided by a fiber optic illuminator with a dual branch flexible light guide. Due to the macro configuration and wide angle of the lens, distortion has been introduced into the image. This distortion must be taken into account in order to make accurate measurements. Products & Services
Fresnel lenses resemble a planoconvex or planoconcave lens that is cut into narrow rings and flattened. If the steps are narrow, the surface of each step is generally made conical and not spherical.
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Spherical lenses, also known as singlets, are transparent optical components consisting of one or more pieces of optical glass with surfaces so curved that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object. This area includes micro spherical lenses as well.
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Optical lenses are transparent components made from optical-quality materials and curved to converge or diverge transmitted rays from an object. These rays then form a real or virtual image of the object. This area includes micro lenses.
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A diffraction grating uses a substrate with parallel grooves to disperse light into its spectra. Eschelles are included in this area.
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Optical polarizers are optical devices that can transform unpolarized or natural light into polarized light, usually by the selective transmission of polarized rays.
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