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Radiant flux

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The rate of energy flow through the surface fluctuates at the frequency of the radiation, but radiation detectors only respond to the average rate of flow. This is represented by replacing the Poynting vector with the time average of its norm, giving
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per unit frequency or wavelength. The latter is commonly measured in W⋅m⋅nm. "Spectral emittance" is an old term for this quantity. This is sometimes also confusingly called "spectral intensity".
395:{\displaystyle {\begin{aligned}\Phi _{\mathrm {e} }&={\frac {dQ_{\mathrm {e} }}{dt}}\\Q_{\mathrm {e} }&=\int _{T}\int _{\Sigma }\mathbf {S} \cdot {\hat {\mathbf {n} }}\,dAdt\end{aligned}}} 489: 737: 625: 647: 1661:
per unit area. This is the emitted component of radiosity. "Radiant emittance" is an old term for this quantity. This is sometimes also confusingly called "intensity".
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per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". Non-SI units of spectral flux density include
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per unit frequency or wavelength. The latter is commonly measured in W⋅m⋅nm. This is sometimes also confusingly called "spectral intensity".
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Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power", and called
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per unit frequency or wavelength. The latter is commonly measured in J⋅m⋅nm. This is sometimes also called "spectral fluence".
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A flow chart describing the relationship of various physical quantities, including radiant flux and exitance.
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Radiant intensity per unit frequency or wavelength. The latter is commonly measured in W⋅sr⋅nm. This is a
563:{\displaystyle \Phi _{\mathrm {e} }\approx \int _{\Sigma }\langle |\mathbf {S} |\rangle \cos \alpha \ dA,} 797:{\displaystyle \Phi _{\mathrm {e} ,\lambda }={\frac {\partial \Phi _{\mathrm {e} }}{\partial \lambda }},} 82: 2117: 2059: 2148: 2163: 707:{\displaystyle \Phi _{\mathrm {e} ,\nu }={\frac {\partial \Phi _{\mathrm {e} }}{\partial \nu }},} 60: 1894: 1547: 1504: 932: 38: 1400: 1901:
should be denoted with suffix "e" (for "energetic") to avoid confusion with photometric or
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per unit frequency or wavelength. The latter is commonly measured in W⋅sr⋅m⋅nm. This is a
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Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a
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Radiant flux per unit frequency or wavelength. The latter is commonly measured in W⋅nm.
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integrated over time of irradiation. This is sometimes also called "radiant fluence".
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Radiometry and the Detection of Optical Radiation (Pure & Applied Optics Series)
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quantity. This is sometimes also confusingly called "spectral intensity".
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per unit area. This is sometimes also confusingly called "intensity".
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per unit area. This is sometimes also confusingly called "intensity".
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quantity. This is sometimes also confusingly called "intensity".
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emitted, reflected, transmitted, or received per unit time, and
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Radiant flux emitted, reflected, transmitted or received by a
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is taken as a function of frequency or of wavelength. The
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Comparison of photometric and radiometric quantities
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Unsourced material may be challenged and removed. 796: 706: 619: 562: 394: 1986: 2140: 2027:Directional quantities are denoted with suffix " 2018: 1965: 1963: 1961: 1959: 1957: 1955: 1953: 2079: 2077: 2075: 1776:per unit area, or equivalently irradiance of a 1328:watt per steradian per square metre, per metre 620:{\displaystyle \langle |\mathbf {S} |\rangle .} 1287:watt per steradian per square metre per hertz 247:('e' for "energetic", to avoid confusion with 1950: 842: 2072: 1888: 611: 593: 536: 518: 225: 1538:(emitted, reflected and transmitted by) a 849: 835: 375: 134:Learn how and when to remove this message 815: 145: 14: 2141: 811: 1784: 1665: 1546: 1395: 1266: 1143: 1016: 927:Energy of electromagnetic radiation. 869: 866: 863: 860: 2116: 1923:Alternative symbols sometimes seen: 1239:watt per steradian per square metre 72:adding citations to reliable sources 43: 2005:Spectral quantities given per unit 1969:Spectral quantities given per unit 218:)—commonly the watt per nanometre ( 27:Measure of radiant energy over time 24: 2110: 1840:joule per square metre, per metre 782: 774: 769: 765: 747: 742: 692: 684: 679: 675: 657: 652: 513: 499: 494: 348: 320: 293: 268: 263: 25: 2175: 1803:joule per square metre per hertz 1721:watt per square metre, per metre 1602:watt per square metre, per metre 1483:watt per square metre, per metre 1684:watt per square metre per hertz 1565:watt per square metre per hertz 1418:watt per square metre per hertz 966:Radiant energy per unit volume. 629: 602: 527: 365: 354: 48: 230: 59:needs additional citations for 607: 597: 532: 522: 369: 13: 1: 2065: 1772:Radiant energy received by a 1203:watt per steradian per metre 1162:watt per steradian per hertz 178:is the radiant flux per unit 7: 2038: 1897:recommend that radiometric 722:Spectral flux in wavelength 481:represents the time period. 251:quantities), is defined as 186:, depending on whether the 10: 2180: 635:Spectral flux in frequency 36: 29: 2060:Radiosity (heat transfer) 2009:are denoted with suffix " 1973:are denoted with suffix " 1860: 1817: 1741: 1698: 1622: 1579: 1503: 1432: 1348: 1301: 1223: 1180: 1094: 1057: 970: 931: 888: 883: 880: 877: 874: 576:is the time average, and 226:Mathematical definitions 30:Not to be confused with 1895:Standards organizations 1757:joule per square metre 471:represents the area of 194:of radiant flux is the 2124:. Wiley-Interscience. 1818:Radiant exposure of a 1699:Radiant exitance of a 1638:watt per square metre 1519:watt per square metre 1368:watt per square metre 947:joule per cubic metre 933:Radiant energy density 821: 798: 708: 621: 564: 396: 151: 39:Spectral power density 1947:for radiant exitance. 1401:Spectral flux density 819: 799: 709: 622: 580:is the angle between 565: 397: 149: 1931:for radiant energy, 738: 648: 590: 490: 255: 68:improve this article 2154:Physical quantities 1397:Spectral irradiance 1271:Specific intensity 857: 829:SI radiometry units 812:SI radiometry units 808:is the wavelength. 443:, representing the 1939:for radiant flux, 1548:Spectral radiosity 1145:Spectral intensity 826: 822: 794: 718:is the frequency. 704: 617: 560: 447:of radiant energy; 392: 390: 152: 2131:978-0-471-86188-1 1884: 1883: 1786:Spectral exposure 1667:Spectral exitance 1268:Spectral radiance 1096:Radiant intensity 789: 699: 573:⟨-⟩ 550: 424:passing out of a 372: 308: 144: 143: 136: 118: 16:(Redirected from 2171: 2135: 2104: 2103: 2101: 2100: 2081: 2032: 2025: 2016: 2003: 1984: 1979:" (Greek letter 1967: 1948: 1946: 1943:for irradiance, 1942: 1938: 1934: 1930: 1926: 1921: 1906: 1892: 1837: 1800: 1754: 1743:Radiant exposure 1718: 1681: 1635: 1624:Radiant exitance 1599: 1562: 1516: 1480: 1464: 1460: 1456: 1448: 1444: 1433:Irradiance of a 1415: 1365: 1325: 1284: 1236: 1200: 1159: 1107: 1071: 1030: 981: 944: 901: 858: 851: 844: 837: 830: 825: 807: 803: 801: 800: 795: 790: 788: 780: 779: 778: 777: 763: 758: 757: 750: 734:, is defined as 733: 717: 713: 711: 710: 705: 700: 698: 690: 689: 688: 687: 673: 668: 667: 660: 644:, is defined as 626: 624: 623: 618: 610: 605: 600: 585: 579: 575: 574: 569: 567: 566: 561: 548: 535: 530: 525: 517: 516: 504: 503: 502: 480: 474: 470: 462: 454: 438: 430: 419: 408: 401: 399: 398: 393: 391: 374: 373: 368: 363: 357: 352: 351: 342: 341: 325: 324: 323: 309: 307: 299: 298: 297: 296: 282: 273: 272: 271: 245: 221: 217: 213: 205: 139: 132: 128: 125: 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487: 478: 472: 466: 460: 450: 445:current density 441:Poynting vector 434: 428: 418: 412: 406: 389: 388: 364: 362: 361: 353: 347: 343: 337: 333: 326: 319: 318: 314: 311: 310: 300: 292: 291: 287: 283: 281: 274: 267: 266: 262: 258: 256: 253: 252: 244: 240: 233: 228: 219: 215: 211: 203: 140: 129: 123: 120: 77: 75: 65: 53: 42: 35: 28: 23: 22: 15: 12: 11: 5: 2177: 2167: 2166: 2164:Temporal rates 2161: 2156: 2151: 2137: 2136: 2130: 2112: 2109: 2106: 2105: 2070: 2069: 2067: 2064: 2063: 2062: 2057: 2052: 2047: 2040: 2037: 2034: 2033: 2017: 1985: 1949: 1907: 1886: 1885: 1882: 1881: 1879: 1878: 1873: 1868: 1862: 1858: 1857: 1844: 1841: 1838: 1831: 1824: 1823: 1816: 1807: 1804: 1801: 1794: 1788: 1782: 1781: 1770: 1761: 1758: 1755: 1751: 1745: 1739: 1738: 1725: 1722: 1719: 1712: 1705: 1704: 1697: 1688: 1685: 1682: 1675: 1669: 1663: 1662: 1651: 1642: 1639: 1636: 1632: 1626: 1620: 1619: 1606: 1603: 1600: 1593: 1586: 1585: 1578: 1569: 1566: 1563: 1556: 1550: 1544: 1543: 1532: 1523: 1520: 1517: 1513: 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515: 511: 507: 501: 496: 483: 482: 476: 464: 459:of a point on 448: 432: 426:closed surface 422:radiant energy 416: 410: 387: 384: 381: 378: 371: 367: 360: 356: 350: 346: 340: 336: 332: 329: 327: 322: 317: 313: 312: 306: 303: 295: 290: 286: 280: 277: 275: 270: 265: 261: 260: 242: 232: 229: 227: 224: 176:spectral power 168:radiant energy 142: 141: 83:"Radiant flux" 56: 54: 47: 32:Radiation flux 26: 9: 6: 4: 3: 2: 2176: 2165: 2162: 2160: 2157: 2155: 2152: 2150: 2147: 2146: 2144: 2133: 2127: 2123: 2119: 2115: 2114: 2094: 2090: 2089:ISO 9288:1989 2086: 2080: 2078: 2076: 2071: 2061: 2058: 2056: 2053: 2051: 2048: 2046: 2045:Luminous flux 2043: 2042: 2030: 2024: 2022: 2014: 2013: 2008: 2002: 2000: 1998: 1996: 1994: 1992: 1990: 1982: 1978: 1977: 1972: 1966: 1964: 1962: 1960: 1958: 1956: 1954: 1920: 1918: 1916: 1914: 1912: 1904: 1900: 1896: 1891: 1887: 1877: 1874: 1872: 1869: 1867: 1864: 1863: 1859: 1856: 1852: 1848: 1845: 1842: 1839: 1835: 1830: 1826: 1825: 1821: 1815: 1811: 1808: 1805: 1802: 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1208: 1205: 1202: 1198: 1193: 1189: 1188: 1184: 1178: 1174: 1170: 1167: 1164: 1161: 1157: 1152: 1148: 1146: 1142: 1138: 1134: 1132: 1128: 1124: 1121: 1119: 1115: 1113: 1109: 1103: 1099: 1097: 1093: 1090: 1086: 1082: 1079: 1076: 1073: 1069: 1062: 1061: 1055: 1051: 1047: 1044: 1042: 1038: 1036: 1032: 1028: 1021: 1019: 1018:Spectral flux 1015: 1011: 1007: 1005: 1001: 997: 994: 991: 988: 986: 983: 975: 973: 969: 965: 963: 959: 955: 952: 949: 946: 940: 936: 934: 930: 926: 924: 920: 916: 913: 911: 908: 906: 903: 897: 893: 891: 887: 873: 859: 852: 847: 845: 840: 838: 833: 832: 824: 818: 809: 791: 785: 759: 754: 751: 731: 723: 719: 701: 695: 669: 664: 661: 642: 636: 630:Spectral flux 627: 614: 584: 557: 554: 551: 545: 542: 539: 509: 505: 477: 469: 465: 458: 457:normal vector 453: 449: 446: 442: 437: 433: 427: 423: 415: 411: 405: 404: 403: 385: 382: 379: 376: 358: 344: 338: 334: 330: 328: 315: 304: 301: 288: 284: 278: 276: 250: 246: 237: 223: 209: 201: 197: 193: 189: 185: 181: 177: 173: 172:spectral flux 169: 165: 164:radiant power 161: 157: 148: 138: 135: 127: 124:December 2009 116: 113: 109: 106: 102: 99: 95: 92: 88: 85: –  84: 80: 79:Find sources: 73: 69: 63: 62: 57:This article 55: 51: 46: 45: 40: 33: 19: 18:Radiant power 2121: 2118:Boyd, Robert 2097:. 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Index

Radiant power
Radiation flux
Spectral power density

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A flow chart describing the relationship of various physical quantities, including radiant flux and exitance.
radiometry
radiant energy
frequency
wavelength
spectrum
SI unit
watt
joule
hertz
Φe
photometric
radiant energy
closed surface
Poynting vector
current density

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