View moreDictionaryf number (f/#)f-Theta lens
f/#: f number
m: electron rest mass
n: refractive index
µ: micro- the SI metric unit prefix, which represents one millionth, i.e. 10-6, of a given unit
µm: micron (also referred to as the micrometer)- which represents one millionth, i.e. 10-6 of the SI unit for length that is the meter.
2D profile sensor
3-D: three-dimensional
3D laser line profile sensor

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