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physical object > artifact > device > instrument > optical device > detector > photoelectric device

photoelectric device
subject			fact

photoelectric device	has definition Any detector which uses the photoelectric effect to convert photons to electrons.
	is a kind of detector
instrument	has operator
artifact	has creator
	has creation date
	has purpose
	has owner
physical object	has location or center of gravity
	has angular momentum
	has mass
	has velocity
	has momentum
	has temperature
	has volume
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	has material

Kinds of photoelectric device :

• photocathode (2 facts) - A thin metallic plate housed inside an evacuated tube capable of releasing electrons through the "photoelectric effect" when illuminated by light. These surfaces are best for optical and ultraviolet light.
• photomultiplier (3 facts) - Device used in photometry for the amplification of light by the release and acceleration of electrons from a sensitive surface. The result is a measurable electric current that is proportional to the intensity of received radiation., A vacuum encapsulated photocathode from which electrons are ejected by the photoelectric effect followed by multiple cathodes from which many additional electrons are emitted in a cascade. When finally collected, the original single electron may have generated a pulse of over one million electrons.

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