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Working characteristics of xenon lamp

The arc of the Xenon Lamp is generated between two solid tungsten electrodes and in pure xenon gas at a certain pressure, and is installed in a glass shell made of quartz glass. Xenon Lamps can be designed for both AC and DC, and can be made into short arc type (xE) or straight tube type (XB). The arc length of the short arc light source is only a few millimeters, the arc is electrode-stabilized, and is located in the center of the larger part of the approximately spherical bulb shell. The shape of the electrode has a significant effect on the stability of the arc. When the electrode produces "point growth" and causes deformation, it is like the current instability. This type of lamp is generally designed to work under a stable DC power supply. Since the arc of this lamp is short, low voltage and high current are required.

If it works under a current of more than 100 amperes, a relatively wide and thick molybdenum foil can be used for annular sealing. When the gas filling pressure in the lamp is increased, the lamp voltage caused by the higher power load increases, the light efficiency is improved, and especially the arc brightness is improved, which creates conditions for the superiority of this lamp. The cold filling pressure can be as high as 12 atmospheres, so the bulb is in danger of explosion. The arc of the short-arc Xenon Lamp is very bright, and its radiation is close to the spectral power distribution of sunlight. This is the only existing light source that approximates the performance of sunlight in terms of intensity and collimation.

Straight-tube Xenon Lamps have a wall-stabilized arc in a tubular quartz glass envelope, and the design is simpler than that of short-arc light sources. Since the assembly can be partially mechanized, the production cost is also lower. The shape of the electrode has no serious effect on the stability of the arc.

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