Photonics Dictionary: F

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field emission display

An X-Y electrically addressable series of arrays with individual electron emitters bombarding a phosphor-coated transparent plate. The phosphor is induced into luminescence, similar to traditional...

filament emission

The freeing of electrons from a filament in an electron tube as the result of the filament being heated by an electric current.

filament transformer

A transformer that is designed to regulate the amount of current that passes through an electron tube's filament.

flash sensitometer

A sensitometer that utilizes an electronic flashtube or a photoflash lamp as both the light source and the shutter for obtaining short-duration exposures.

flashtube -> electronic flash unit

A small xenon-filled tube with metal electrodes fused into the ends. The gas flashes brilliantly when a condenser is discharged through the tube. The duration of the flash is primarily dependent upon...

fluorescent screen

A fluorescent screen refers to a phosphorescent or fluorescent-coated surface that emits visible light when exposed to other forms of electromagnetic radiation, such as x-rays or ultraviolet light....

flyback

The time it takes a cathode-ray tube's electron beam to return to its starting point after completing one line, one field or one trace.

focusing anode

One of the electrodes used to focus the electron beam of a cathode-ray tube. As the electrode's voltage is changed, its electrical field is changed, resulting in a change of the electron beam's spot...

fused quartz and silica

Fused quartz and silica are closely related materials, both composed primarily of silicon dioxide (SiO2), but they are produced through different manufacturing processes and have distinct properties...

Photonics DictionaryF

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