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- Disappearing-filament_pyrometer abstract "The disappearing-filament pyrometer is an optical pyrometer, in which comparison is made between two bright objects to determine temperature.The simplest design has optics like a Keplerian Telescope. A thin wire (filament), placed at the focal plane of the objective lens, is heated by electric current. When seen through the eyepiece, the wire appears in front of the object under investigation. The user has to compare the brightness of the glowing wire with the object behind and adjust the heating power of the wire such that both appear with the same color and brightness. Then, the wire seemingly disappears in front of the glowing object. The temperature of the wire is known through calibration of its resistance-vs.-temperature curve.Other designs use a prism to place the images of the object under study and a calibrated glowing surface next to each other, e.g. as a disk inside a ring.Some disappearing-filament pyrometer use a red filter to reduce light from the environment (hot objects glow red). In addition, for very hot objects, additional filters can be used to protect the eye from excessive light.Disappearing-filament pyrometer can be used only if the object under study emits visible light similar to a hot black body; this means that its temperature must be high enough (around 600 °C and up) and the object must not be fully transparent or highly reflective. For good accuracy, the object should appear dark gray or black when cold.".
- Disappearing-filament_pyrometer wikiPageExternalLink glossary.aspx?word=Disappearing+Filament+Pyrometer+(Optical+Pyrometer).
- Disappearing-filament_pyrometer wikiPageID "8328833".
- Disappearing-filament_pyrometer wikiPageRevisionID "606216153".
- Disappearing-filament_pyrometer subject Category:Measuring_instruments.
- Disappearing-filament_pyrometer subject Category:Optical_instruments.
- Disappearing-filament_pyrometer comment "The disappearing-filament pyrometer is an optical pyrometer, in which comparison is made between two bright objects to determine temperature.The simplest design has optics like a Keplerian Telescope. A thin wire (filament), placed at the focal plane of the objective lens, is heated by electric current. When seen through the eyepiece, the wire appears in front of the object under investigation.".
- Disappearing-filament_pyrometer label "Disappearing-filament pyrometer".
- Disappearing-filament_pyrometer sameAs m.026_lfm.
- Disappearing-filament_pyrometer sameAs Q16961920.
- Disappearing-filament_pyrometer sameAs Q16961920.
- Disappearing-filament_pyrometer wasDerivedFrom Disappearing-filament_pyrometer?oldid=606216153.
- Disappearing-filament_pyrometer isPrimaryTopicOf Disappearing-filament_pyrometer.