Look up emitter in Wiktionary, the free dictionary.

An emitter may be:

[edit] In general

• A device used to exude any signal, beacon, light, odor, liquid, fragrance, or any other type of signal.

[edit] In horticulture

• A device used in drip irrigation.

[edit] In electronics and instrument physics

• Another name for the cathode in vacuum tube technology which emits electrons through thermionic emission or field electron emission.
• Another name for the anode in scientific instruments and techniques based on the emission of ions from a solid surface, for example Atom Probe Tomography.
• The analog of the vacuum tube cathode in transistor technology, though the current flow through it may be either positive or negative, depending on the type of transistor.
• An infrared LED used to emulate a remote control. It can also be wired into the integrated receiver/decoder of a satellite TV unit, so that it can operate a VCR to record a TV show when selected from the electronic program guide. The wired emitter is stuck with an adhesive to the front of the VCR, and mimics the signals of the remote, eliminating the need to set the VCR separately.
• Lambertian Emitter - a light source whose radiance is according to Lambert's cosine law.

[edit] See also

• Emission (electromagnetic radiation)

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