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| densitometer ： ウィキペディア英語版 |
densitometer
:''Not to be confused with hydrometer which measures mass density of liquids.''
A densitometer is a device that measures the degree of darkness (the optical density) of a photographic or semitransparent material or of a reflecting surface. The densitometer is basically a light source aimed at a photoelectric cell. It determines the density of a sample placed between the light source and the photoelectric cell from differences in the readings. Modern densitometers have the same components, but also have electronic integrated circuitry for better reading.
==Types==
*Transmission densitometers that measure transparent materials
*Reflection densitometers that measure light reflected from a surface.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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