Keithley 2520INT, Быстрый старт

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2-4 Getting Started Model 2520INT Quick Start Guide
Figure 2-3
Divergent beams
Collimated beams
Collimated beams differ from divergent beams in that the edges of the beam are parallel.
As shown in
Figure 2-4 , the beam diameter stays constant even as the distance from the
source increases.
Figure 2-4
Collimated beams
Light
Source
Detector
Entrance
Port
Light
Source
Detector
Entrance
Port