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Xenon short-arc lamp: Difference between revisions
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[[File:Xenon diagram.jpg|700px]] | |||
A '''xenon short-arc lamp''' is a [[light sources|light source]] used for projection. Light is produced by electricity arcing between tungsten electrodes in a quartz envelope that contains highly compressed xenon gas. Most of the light is generated by a plasma ball that forms at the tip of the cathode. For maximum light output, the lamp is aligned so that this plasma ball is positioned as close as possible to the focal point of the [[reflector]]. This is one of the steps taken to calibrate overall [[optical alignment]]. | A '''xenon short-arc lamp''' is a [[light sources|light source]] used for projection. Light is produced by electricity arcing between tungsten electrodes in a quartz envelope that contains highly compressed xenon gas. Most of the light is generated by a plasma ball that forms at the tip of the cathode. For maximum light output, the lamp is aligned so that this plasma ball is positioned as close as possible to the focal point of the [[reflector]]. This is one of the steps taken to calibrate overall [[optical alignment]]. | ||
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When using larger lamps, precautions must be taken to prevent [[film damage|heat damage]] to the film. The [[reflector]] should be a dichroic mirror, and a [[heat shield]] should be installed to filter out UV light. When running 35mm, the projector should be equipped with a water-cooled gate for lamps exceeding 3kW. Regulating heat is even more important when running 16mm, because the light is focused on a smaller surface area. Film can also be damaged by a lamp that is misaligned, creating a hotspot that blisters one portion of the frame. | When using larger lamps, precautions must be taken to prevent [[film damage|heat damage]] to the film. The [[reflector]] should be a dichroic mirror, and a [[heat shield]] should be installed to filter out UV light. When running 35mm, the projector should be equipped with a water-cooled gate for lamps exceeding 3kW. Regulating heat is even more important when running 16mm, because the light is focused on a smaller surface area. Film can also be damaged by a lamp that is misaligned, creating a hotspot that blisters one portion of the frame. | ||
<gallery widths= | <gallery widths=200px heights=200px mode=packed>> | ||
File:Xenon lamp in shield.jpg|A 1.2kW Ushio xenon lamp in its shield. | File:Xenon lamp in shield.jpg|A 1.2kW Ushio xenon lamp in its shield. | ||
File:Xenon lamp close up.JPG|This lamp was removed at the end of its warranty. There is visible wear on the cathode. | File:Xenon lamp close up.JPG|This lamp was removed at the end of its warranty. There is visible wear on the cathode. | ||