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The nominal sensor size (in inches) is just a rough estimate of the light sensitive diagonal. The true dimensions can be calculated from the sensor's resolution (width and height) multiplied with its pixel size. Example: A sensor with 1456 x 1088 px resolution and a pixel size of 3.45 µm has an optical area of 5.023 mm x 3.754 mm and a diagonal of approx. 6.27 mm. Its nominal size is 1/3''.

Figure 3.2: Table relating the f-number, lens aperture diameter, and aperture opening area. Figure 3.3: Numerical aperture determining factors. Page 3 ...

•Using the same lens, the field of view (FOV) decreases for smaller sensors. Changing to a sensor with a different size also requires a different lens (different focal length), if the FOV should be kept.

White LEDs, too, primary only generate monochromatic light. Only by means of a trick, white light is produced: The light of a 100% blue-emitting LED stimulates yellow fluorescent dyes, which are arranged around the light-emitting crystal. White light is mixed from the direct emission of blue light and the fluorescence of yellow-green and red light.

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The following figure illustrates the most common sensor formats (in inches) and their corresponding diagonals (in millimeters).

The size of image sensors is typically given in inches. This is a nominal size that does not directly refer to the physical size of the sensor. When image sensors are concerned, one inch equals 16 millimeters (instead of 25.4 mm). This conversion dates back to tube technology: With a 1" tube (outer diameter = 25.4 mm), the light sensitive area had a diagonal of approximately 16 mm. Using this nominal size, referring to the outer diagonal of the tube instead of the light sensitive area, was continued even with the introduction of semiconductor sensor technology.

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The SCE-series is a low-cost imaging solution featuring a 1/3′′ MP CMOS sensor with 5.2um x 5.2um size pixels.

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Electroluminescent diodes work like semiconductor diodes which generate light in forward direction. Light is emitted in this way. The abbreviation LED stands for "light-emitting diode". The energy and colour of generated light is determined by the semi-conductor material used and its doping. Mixed crystals such as gallium arsenide (GaAs), gallium arsenide phosphide (GaAsP), indium gallium nitride (InGaN), etc. are used.

•The sensor and lens must be matched both in size and in the achievable resolution in order to get high image quality. You can use the IDS lens finder to find a lens that matches your camera model.

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Light-emitting diodes, LEDs for short, have been used for approximately 10 years in industrial image processing. By constantly improving the semi-conductor materials, the intensity could be increased extremely. Today, LED lights cover a major part of industrial applications. Halogen and fluorescent lamps are only frequently used in applications which require large-area illumination, like robot applications or line scan camera inspections where much light and/or the illumination of large areas is required as well.

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The LED consists of a semiconductor material that is n-doped, on top there is a very thin p-doped layer which has a lack of charge carriers. When applying a voltage, an excess of charges is generated in the junction, which recombine with holes in the p-doped material and release their energy there. Since the upper layer is very thin, the light flash can emerge from the material. The light generated in this way is monochromatic due to the exactly defined energy amounts of the semiconductor material. As opposed to an incandescent lamp, the light always has one particular colour.

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•Larger sensors often have larger pixels, can receive more light and therefore have a better signal-to-noise ratio and higher image quality.

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The luminous intensity grows proportionally to the amperage, which is used in industrial machine vision in order to generate high quantities of light by means of high-power LEDs. A consumption of 5 - 25 watts is typical for an LED illumination. The energy yield can be increased even further if you increase the amperage over 100% of the permissible value. The LED would be damaged in continuous operation immediately. By means of a flash controller, however, short intense current pulses (1 per inspection) can be used to overflash to the triple to sixfold quantity in order to generate a multiple of the luminous power.