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HSDL3208 Datasheet(PDF) 17 Page - Agilent(Hewlett-Packard) |
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HSDL3208 Datasheet(HTML) 17 Page - Agilent(Hewlett-Packard) |
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17 / 18 page  17 Window Material Almost any plastic material will work as a window material. Polycarbonate is recommended. The surface finish of the plastic should be smooth, without any texture. An IR filter dye may be used in the window to make it look black to the eye, but the total optical loss of the window should be 10% or less for best optical performance. Light loss should be measured at 875 nm. The recommended plastic materials for use as a cosmetic window are available from General Electric Plastics. Recommended Plastic Materials: Material Light Haze Refractive Number Transmission Index Lexan 141L 88% 1% 1.586 Lexan 920A 85% 1% 1.586 Lexan 940A 85% 1% 1.586 Note: 920A and 940A are more flame retardant than 141L. Recommended Dye: Violet #21051 (IR transmissant above 625 nm). Curved Front and Back (Second Choice) Flat Window (First Choice) Curved Front, Flat Back (Do Not Use) 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 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. Figure 24. Shape of windows. |
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Similar Description - HSDL3208 |
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