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Table 1 Summary of methods used to characterize the illumination spot

From: Beam characterization of a microfading tester: evaluation of several methods

Method Category Estimated beam diameter (µm) Reliability Features of the method
Photography Imaging 1200 Low Easy to use, inexpensive, simple apparatus - camera or smartphone
Aperture
Aluminium foil
Direct Moderate Inexpensive, low accuracy with homemade pinhole
Easy to use, inexpensive, material with a well-defined edge, software for data analysis and calculation
Sharp edge
Razor blade
Silicon wafer
Muscovite
Teflon tape
590.2
605.9
757.1
610.0
CMOS camera Imaging 702.2 Moderate Easy to use, moderate cost, dedicated CMOS detector
Laser beam profiler Imaging 386.1 High Specialist knowledge, costly, advanced equipment - beam profiler