Light source tungsten

Light source Tungsten filament lamp LEDs, xenon flashlamp LEDs Tungsten halogen lamp Xenon flash- lamp Mercury vapour lamp Tungsten halogen lamp... 

An ICP FT spectrometer has three optical inputs incorporated into a single optical axis a He-Ne laser, a white light source (tungsten lamp), and an ICP source. The laser controls the digitization sequence and measures the exact location of the moving mirror. 

Light source tungsten lamp. Wavelength X = 56S nm. Slit 6 x 0.2 mm. 

Instrument, double-beam TLC scanner CS 930 (Shimadzu, Japan) measuring setup, monochromator-sample (remission) light source, tungsten lamp wavelength, see under remission-location curves in figures measuring area, 1.2 mm X 3 mm feed 0.05 mm. 

Ultraviolet light sources are based on the mercury vapor arc. The mercury is enclosed ia a quart2 tube and a potential is appHed to electrodes at either end of the tube. The electrodes can be of iron, tungsten, or other metals and the pressure ia a mercury vapor lamp may range from less than 0.1 to >1 MPa (<1 to >10 atm). As the mercury pressure and lamp operating temperatures are iacreased, the radiation becomes more iatense and the width of the emission lines iacreases (17). 

Clearly, standardized light sources are desirable for color matching, particularly in view of the phenomenon of illuminant metamerism described below. Over the years CIE has defined several standard illuminants, some of which can be closely approximated by practical sources. In 1931 there was Source A, defined as a tungsten filament incandescent lamp at a color temperature of 2854 K. Sources B and C used filtering of A to simulate noon sunlight and north sky daylight, respectively. Subsequently a series of D illuminants was estabUshed to better represent natural daylight. Of these the most important is Illuminant E). ... 

Real or gray bodies deviate from these ideal blackbody values by the A-dependent emissivity, but the color sequence remains essentially the same. This mechanism explains the color of incandescent light sources such as flames in a candle, tungsten filament light bulb, flash bulb, carbon arc, limelight, lightning in part, and the incandescent part of pyrotechnics (qv). 

A light source used frequently for ultraviolet absorption studies is the deuterium lamp. If an instrument is meant strictly for ultraviolet work, then the deuterium lamp is the only light source present and the instrument is called a UV spectrophotometer. Often, both a tungsten filament lamp and a deuterium lamp are present and are individually selectable. Also, instead of having two independently selectable... 

Is the intensity of light emitted by the various light sources used for visible and ultraviolet work the same at all emitted wavelengths How does intensity vary with wavelength for a tungsten filament lamp ... 

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