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HSDL-3000 Datasheet(PDF) 15 Page - Agilent(Hewlett-Packard) |
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HSDL-3000 Datasheet(HTML) 15 Page - Agilent(Hewlett-Packard) |
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15 / 16 page  15 Flat Window (first choice) Curved Front, Flat Back (do not use) Curved Front and Back (second choice) Shape of the Window From an optics standpoint, the window should be flat. This en- sures that the window will not alter either the radiation pattern of the LED, or the receive pattern of the photodiode. If the window must be curved for mechanical design reasons, place a curve on the back side of the window that has the same radius as the front side. While this will not completely eliminate the lens effect of the front curved surface, it will reduce the effects. The amount of change in the radiation pattern is dependent upon the material chosen for the window, the radius of the front and back curves, and the distance from the back surface to the transceiver. Once these items are known, a lens design can be made which will eliminate the effect of the front surface curve. The following drawings show the effects of a curved window on the radiation pattern. In all cases, the center thickness of the win- dow is 1.5 mm, the window is made of polycarbonate plastic, and the distance from the trans- ceiver to the back surface of the window is 3 mm. |
Similar Part No. - HSDL-3000 |
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Similar Description - HSDL-3000 |
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