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HSDL-3003 bảng dữ liệu(PDF) 20 Page - Agilent(Hewlett-Packard) |
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HSDL-3003 bảng dữ liệu(HTML) 20 Page - Agilent(Hewlett-Packard) |
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20 / 21 page ![]() Shape of the Window From an optics standpoint, the window should be flat. This ensures 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 or industrial design reasons, place the same curve on the back side of the window that has an identical radius as the front side. While this will not completely eliminate the lens effect of the front curved surface, it will significantly reduce the effects. The amount of change in the radiation pattern is dependent Curved Front and Back (Second choice) Curved Front, Flat Back (Do not use) Flat Window (First choice) 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 window is 1.5 mm, the window is made of polycarbonate plastic, and the distance from the transceiver to the back surface of the window is 3 mm. 20 |
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