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| | | ARC "INSTABILITY (FLUCTUATION)" and "SHIFT" | | |
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| | | Light source lamps used for high precision photometry must have good arc stability. However, cathodes used in conventional lamps have two shortcomings in terms of arc stability. One problem is that the arc emission point shifts intermittently due to inadequate electron emission from the cathode. The other problem is that the arc point shifts a little at a time due to the cathode tip wear that occurs with operating time as the lamp ages. Hamamatsu super-quiet lamps employ a high performance "BI (Barium-Impregnated) cathode" developed totally in-house that eliminates the above problems to deliver extremely high stability. This durable cathode exhibits no wear at the cathode tip over operating time and the arc point does not shift. So there is no need to realign the optical system until the time finally comes when the lamp must be replaced. Figure 1: "Fluctuation vs. Operating Time" Measurement Block Diagram | | |
| | | Figure 3: Comparison of Cathode Tip Wear HAMAMATSU High performance "BI(Barium-Impregnated) cathode" Initial operation (after 5 hours) After 1000 hours of operation | | |
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| | | Anode | | |
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| | | [Conventional cathodel Initial operation (after 5 hours) After 1000 hours of operation | | |
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| | | SQ XENON LAMP SQ MERCURY-XENON LAMP | | |
| | | ND FILTER APERTURE 0 5 mm | | |
| | | WINDOW d> 20 mm | | |
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| | | AMPLIFIER | | |
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| | | POWER SUPPLY (DROPPER TYPE) | | |
| | | PC | | |
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| | | Figure 2: Fluctuation vs. Operating Time | | |
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| | | 150 W Super-Quiet Xenon Lamp L2273 a) Initial operation (after 5 hours) | | 200 W Super-Quiet Mercury-Xenon Lamp L2423 a) Initial operation (after 5 hours) | | |
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| | | b) After 1000 hours of operation | | b) After 1000 hours of operation | | |
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| | | c) After 2000 hours of operation | | c) After 2000 hours of operation | | |
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| | | 2 min. | | |
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| | | d) After 3000 hours of operation | | |
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