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A design for a simple electronic exposure meter for use with an electron microscope
Author(s) -
Hills G. J.,
Garner R. T.
Publication year - 1973
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1973.tb03811.x
Subject(s) - metre , microscope , optics , fluorescence , electron microscope , materials science , optoelectronics , amplifier , range (aeronautics) , electron , computer science , physics , astronomy , cmos , composite material , quantum mechanics
SUMMARY A circuit has been developed to enable a simple yet sensitive exposure meter to be made for any electron microscope. The circuit is based around an inexpensive operational amplifier and will indicate a current range 10 −4 −10 −11 A which corresponds from maximum illumination to a level of fluorescent screen illumination which is not detectable by eye. The exposure meter measures the charge on the fluorescent screen which is correlated to exposure time for photography.