fluence rate, $E o$

Also contains definitions of: radiant energy fluence rate, spherical irradiance

Total radiant power, $P$ , incident from all directions onto a small sphere divided by the cross-sectional area of that sphere. SI unit is $W m −2$ .

Notes:

Mathematical definition: $E o = d P d S = d H o d t$ . If the radiant power is constant over the area $S$ , $E o = P S$ . Equivalent definition: $E o = ∫ 4 π L ⁢ d Ω$ , with $Ω$ the solid angle of each beam passing through the given point on the surface and $L$ the radiance of the beam at that point.
Fluence rate is identical to spherical irradiance and reduces to irradiance, $E$ , for a parallel and perpendicularly incident beam not scattered or reflected by the target or its surroundings.

Source:

PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 340

Related index:

IUPAC > Gold Book > math/physics > quantities

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Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/10.1351/goldbook.FT07376.

Original PDF version: http://www.iupac.org/goldbook/FT07376.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.

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