Figure of Merit (FOM): Difference between revisions
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Figure of Merit (FOM) is | Figure of Merit (FOM) is a dimensionless value that has been introduced as an arbitrary reference and shorthand overall performance grade of an [[Image Intensifier|image intensifier]]. | ||
It | It is calculated by the formula <math display="block">\mathrm{FOM} = \mathrm{Res.} \cdot \mathrm{SNR}</math> where <math display="inline">\mathrm{Res.}</math> is the [[resolution]] (in lp/mm) and <math>\mathrm{SNR}</math> is the [[Signal-to-Noise Ratio (SNR)|signal-to-noise-ratio]]. | ||
A FOM number gives an indication of a tubes quality and usefulness but is not to be taken as a tell-all-end-all as a full spec sheet gives far more detailed insight as to a tubes performance albeit it might seem slightly more esoteric to people who are unfamiliar with interpreting a spec-sheet. | A FOM number gives an indication of a tubes quality and usefulness but is not to be taken as a tell-all-end-all as a full spec sheet gives far more detailed insight as to a tubes performance albeit it might seem slightly more esoteric to people who are unfamiliar with interpreting a spec-sheet. | ||
In order to fairly judge a tubes FOM rating one should have some knowledge of the category to which a tube belongs as well as an average or minimum number for at least one of the factors involved in producing a FOM rating. If one knows that a particular category of tubes has a minimum SNR of 30 with average at 36 then going by FOM alone when considering an individual tube of that category is less arbitrary | In order to fairly judge a tubes FOM rating one should have some knowledge of the category to which a tube belongs as well as an average or minimum number for at least one of the factors involved in producing a FOM rating. If one knows that a particular category of tubes has a minimum SNR of 30 with average at 36 then going by FOM alone when considering an individual tube of that category is less arbitrary. | ||
[[Category:Technology]] | [[Category:Technology]] | ||
Revision as of 13:49, 27 March 2023
Figure of Merit (FOM) is a dimensionless value that has been introduced as an arbitrary reference and shorthand overall performance grade of an image intensifier.
It is calculated by the formula
A FOM number gives an indication of a tubes quality and usefulness but is not to be taken as a tell-all-end-all as a full spec sheet gives far more detailed insight as to a tubes performance albeit it might seem slightly more esoteric to people who are unfamiliar with interpreting a spec-sheet.
In order to fairly judge a tubes FOM rating one should have some knowledge of the category to which a tube belongs as well as an average or minimum number for at least one of the factors involved in producing a FOM rating. If one knows that a particular category of tubes has a minimum SNR of 30 with average at 36 then going by FOM alone when considering an individual tube of that category is less arbitrary.
