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More on How the Instrument Works

More on How the Instrument Works - More on How the...

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More on How the Instrument Works 1. Light Transduction: the CMOS Camera Computers store all data as binary numbers (zeros and ones). How does the CMOS camera in a cellular telephone or digital camera convert light into numbers? There are several steps. a) Light impinges on the camera's detector surface. Each absorbed photon kicks an electron away from a silicon atom in the detector, so that an electron/hole pair is formed (a hole is the absence of an electron -- just as a hole in the ground is the absence of rock or soil). More on How the Instrument Works http://www.asdlib.org/onlineArticles/elabware/Scheeline_Kelly_Spectrophotometer/... 1 of 6 10/21/10 12:27 PM
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b) Different regions on the detector are sensitive to red, green, and blue light, so the amount of light seen by each region helps establish the color of each portion of the image. In the drawing, a single pixel corresponds to the area covered by one square of each color (red, green, blue, unfiltered). Some cameras have color sensing stacked vertically, avoiding the dead zone for one color where another is being sensed. Typical pixels range from 1.5 μ m to 25 μ m in width. More on How the Instrument Works http://www.asdlib.org/onlineArticles/elabware/Scheeline_Kelly_Spectrophotometer/... 2 of 6 10/21/10 12:27 PM
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c) The more light there is, the greater the number of electron/hole pairs.
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