Emitter

An emitter may be:

Radioactive emitter

In general

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

In horticulture

Horticulture drip emitter

• A device used in drip irrigation.

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 any electronic device.
• Lambertian Emitter - a light source whose radiance is according to Lambert's cosine law.

See also

• Emission (electromagnetic radiation)

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