Knowledge (XXG)

Radiant intensity

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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".
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Unlike power density, radiant intensity does not depend on distance: because radiant intensity is defined as the power through a solid angle, the decreasing power density over distance due to the
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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".
78: 70: 2002: 681: 128: 1929: 530:{\displaystyle I_{\mathrm {e} ,\Omega ,\lambda }={\frac {\partial I_{\mathrm {e} ,\Omega }}{\partial \lambda }},} 325:
refers to the solid angle into which the light is emitted. When calculating radiance received by a detector,
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Radiant intensity per unit frequency or wavelength. The latter is commonly measured in W⋅sr⋅nm. This is a
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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".
1996: 283: 101:) and that of spectral intensity in wavelength is the watt per steradian per metre ( 1200: 864: 818: 254: 50: 17: 1827: 329:
refers to the solid angle subtended by the source as viewed from that detector.
264: 54: 93:), while that of spectral intensity in frequency is the watt per steradian per 1853: 1717: 1243: 1196: 856: 646: 110: 66: 42: 1817: 964: 958: 86: 62: 1830:, not to be confused with a letter "v", indicating a photometric quantity.) 1157:
quantity. This is sometimes also confusingly called "spectral intensity".
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Radiant intensity is used to characterize the emission of radiation by an
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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".
1766: 1764: 1762: 1760: 1758: 1749: 1285: 625:{\displaystyle I_{\mathrm {e} ,\Omega }=E_{\mathrm {e} }(r)\,r^{2},} 1884: 887: 881: 756: 751: 94: 30:"Radiation intensity" redirects here. For ionizing radiation, see 1109:
quantity. This is sometimes also confusingly called "intensity".
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is taken as a function of frequency or of wavelength. These are
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Radiant flux emitted, reflected, transmitted or received by a
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When calculating the radiant intensity emitted by a source,
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emitted, reflected, transmitted or received, per unit
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Comparison of photometric and radiometric quantities
1848: 1846: 1844: 1842: 1840: 1838: 1836: 1870: 1868: 624: 529: 424: 227: 663:is offset by the increase in area with distance. 105:)—commonly the watt per steradian per nanometre ( 1874:Directional quantities are denoted with suffix " 1812: 1810: 1808: 1806: 1804: 1802: 1800: 1924: 1922: 1920: 1623:per unit area, or equivalently irradiance of a 1175:watt per steradian per square metre, per metre 1134:watt per steradian per square metre per hertz 689: 8: 1958:de Kraus, John; Marhefka, Ronald J. (2002). 257:emitted, reflected, transmitted or received; 1385:(emitted, reflected and transmitted by) a 696: 682: 672: 613: 608: 592: 591: 571: 570: 564: 500: 499: 489: 467: 466: 460: 395: 394: 384: 362: 361: 355: 204: 203: 193: 177: 176: 170: 131:, radiant intensity is sometimes called 1916: 1734: 109:). Radiant intensity is distinct from 27:Intensity of electromagnetic radiation 1631: 1512: 1393: 1242: 1113: 990: 863: 774:Energy of electromagnetic radiation. 716: 713: 710: 707: 7: 1770:Alternative symbols sometimes seen: 1086:watt per steradian per square metre 1852:Spectral quantities given per unit 1816:Spectral quantities given per unit 1687:joule per square metre, per metre 593: 579: 572: 515: 508: 501: 492: 475: 468: 410: 403: 396: 387: 370: 363: 216: 213: 205: 200: 196: 185: 178: 61:is the radiant intensity per unit 25: 1987:Radiation: Activity and Intensity 1650:joule per square metre per hertz 1568:watt per square metre, per metre 1449:watt per square metre, per metre 1330:watt per square metre, per metre 655:is the distance from the antenna. 1531:watt per square metre per hertz 1412:watt per square metre per hertz 1265:watt per square metre per hertz 813:Radiant energy per unit volume. 443:Spectral intensity in wavelength 36:Light intensity (disambiguation) 338:Spectral intensity in frequency 278:is a function of viewing angle 605: 599: 1: 1960:Antennas for all applications 1619:Radiant energy received by a 1050:watt per steradian per metre 1009:watt per steradian per hertz 286:. For the special case of a 81:of radiant intensity is the 1744:recommend that radiometric 548:Radio-frequency engineering 129:radio-frequency engineering 69:, depending on whether the 2024: 127:other than radiometry. In 29: 1856:are denoted with suffix " 1820:are denoted with suffix " 1707: 1664: 1588: 1545: 1469: 1426: 1350: 1279: 1195: 1148: 1070: 1027: 941: 904: 817: 778: 735: 730: 727: 724: 721: 162:quantity), is defined as 117:, which are often called 139:Mathematical definitions 1989:NDE/NDT Resource Center 1742:Standards organizations 1604:joule per square metre 1890: 1665:Radiant exposure of a 1546:Radiant exitance of a 1485:watt per square metre 1366:watt per square metre 1215:watt per square metre 794:joule per cubic metre 780:Radiant energy density 626: 531: 426: 229: 1888: 1794:for radiant exitance. 1248:Spectral flux density 627: 532: 427: 230: 1778:for radiant energy, 563: 459: 354: 299:Lambert's cosine law 169: 2003:Physical quantities 1244:Spectral irradiance 1118:Specific intensity 704: 676:SI radiometry units 667:SI radiometry units 544:is the wavelength. 133:radiation intensity 18:Radiation intensity 1905:Luminous intensity 1891: 1786:for radiant flux, 1395:Spectral radiosity 992:Spectral intensity 673: 661:inverse-square law 622: 527: 439:is the frequency. 422: 333:Spectral intensity 288:Lambertian surface 244:partial derivative 225: 59:spectral intensity 1731: 1730: 1633:Spectral exposure 1514:Spectral exitance 1115:Spectral radiance 943:Radiant intensity 522: 417: 220: 149:Radiant intensity 144:Radiant intensity 47:radiant intensity 16:(Redirected from 2015: 1974: 1973: 1962:(3rd ed.). 1955: 1949: 1948: 1946: 1945: 1926: 1879: 1872: 1863: 1850: 1831: 1826:" (Greek letter 1814: 1795: 1793: 1790:for irradiance, 1789: 1785: 1781: 1777: 1773: 1768: 1753: 1739: 1684: 1647: 1601: 1590:Radiant exposure 1565: 1528: 1482: 1471:Radiant exitance 1446: 1409: 1363: 1327: 1311: 1307: 1303: 1295: 1291: 1280:Irradiance of a 1262: 1212: 1172: 1131: 1083: 1047: 1006: 954: 918: 877: 828: 791: 748: 705: 698: 691: 684: 677: 631: 629: 628: 623: 618: 617: 598: 597: 596: 583: 582: 575: 536: 534: 533: 528: 523: 521: 513: 512: 511: 504: 490: 485: 484: 471: 452:, is defined as 431: 429: 428: 423: 418: 416: 408: 407: 406: 399: 385: 380: 379: 366: 347:, is defined as 282:and potentially 234: 232: 231: 226: 221: 219: 211: 210: 209: 208: 194: 189: 188: 181: 115:radiant exitance 108: 104: 100: 92: 77:quantities. The 21: 2023: 2022: 2018: 2017: 2016: 2014: 2013: 2012: 1993: 1992: 1983: 1978: 1977: 1970: 1957: 1956: 1952: 1943: 1941: 1940:catalogue. 1989 1928: 1927: 1918: 1913: 1896: 1883: 1882: 1873: 1866: 1851: 1834: 1815: 1798: 1791: 1787: 1783: 1779: 1775: 1771: 1769: 1756: 1740: 1736: 1727: 1683: 1674: 1646: 1637: 1600: 1594: 1564: 1555: 1527: 1518: 1481: 1475: 1445: 1436: 1427:Radiosity of a 1408: 1399: 1362: 1356: 1326: 1317: 1309: 1305: 1301: 1298:solar flux unit 1293: 1289: 1261: 1252: 1246: 1211: 1205: 1199: 1171: 1162: 1130: 1121: 1117: 1082: 1076: 1046: 1037: 1005: 996: 953: 947: 921:watt per metre 917: 910: 876: 869: 827: 823: 790: 784: 747: 741: 703: 702: 675: 669: 649:of the antenna; 644: 609: 587: 566: 561: 560: 550: 514: 495: 491: 462: 457: 456: 451: 409: 390: 386: 357: 352: 351: 346: 335: 313: 306: 296: 277: 252: 212: 199: 195: 172: 167: 166: 157: 146: 141: 123:in branches of 106: 102: 98: 90: 39: 28: 23: 22: 15: 12: 11: 5: 2021: 2019: 2011: 2010: 2005: 1995: 1994: 1991: 1990: 1982: 1981:External links 1979: 1976: 1975: 1968: 1950: 1915: 1914: 1912: 1909: 1908: 1907: 1902: 1895: 1892: 1881: 1880: 1864: 1832: 1796: 1754: 1733: 1732: 1729: 1728: 1726: 1725: 1720: 1715: 1709: 1705: 1704: 1691: 1688: 1685: 1678: 1671: 1670: 1663: 1654: 1651: 1648: 1641: 1635: 1629: 1628: 1617: 1608: 1605: 1602: 1598: 1592: 1586: 1585: 1572: 1569: 1566: 1559: 1552: 1551: 1544: 1535: 1532: 1529: 1522: 1516: 1510: 1509: 1498: 1489: 1486: 1483: 1479: 1473: 1467: 1466: 1453: 1450: 1447: 1440: 1433: 1432: 1425: 1416: 1413: 1410: 1403: 1397: 1391: 1390: 1379: 1370: 1367: 1364: 1360: 1354: 1348: 1347: 1334: 1331: 1328: 1321: 1314: 1313: 1306:10 W⋅m⋅Hz 1294:10 W⋅m⋅Hz 1278: 1269: 1266: 1263: 1256: 1250: 1240: 1239: 1228: 1219: 1216: 1213: 1209: 1203: 1193: 1192: 1179: 1176: 1173: 1166: 1159: 1158: 1149:Radiance of a 1147: 1138: 1135: 1132: 1125: 1119: 1111: 1110: 1099: 1090: 1087: 1084: 1080: 1074: 1068: 1067: 1054: 1051: 1048: 1041: 1034: 1033: 1026: 1013: 1010: 1007: 1000: 994: 988: 987: 980: 967: 961: 955: 951: 945: 939: 938: 925: 922: 919: 912: 907: 906: 903: 890: 884: 878: 871: 867: 861: 860: 859:in Astronomy. 853: 840: 834: 829: 825: 821: 815: 814: 811: 798: 795: 792: 788: 782: 776: 775: 772: 759: 754: 749: 745: 739: 737:Radiant energy 733: 732: 729: 726: 723: 719: 718: 715: 712: 709: 701: 700: 693: 686: 678: 674: 668: 665: 657: 656: 650: 642: 633: 632: 621: 616: 612: 607: 604: 601: 595: 590: 586: 581: 578: 574: 569: 549: 546: 538: 537: 526: 520: 517: 510: 507: 503: 498: 494: 488: 483: 480: 477: 474: 470: 465: 449: 433: 432: 421: 415: 412: 405: 402: 398: 393: 389: 383: 378: 375: 372: 369: 365: 360: 344: 334: 331: 311: 304: 294: 275: 269: 268: 258: 250: 247: 236: 235: 224: 218: 215: 207: 202: 198: 192: 187: 184: 180: 175: 155: 145: 142: 140: 137: 32:Radiation flux 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2020: 2009: 2006: 2004: 2001: 2000: 1998: 1988: 1985: 1984: 1980: 1971: 1969:0-07-232103-2 1965: 1961: 1954: 1951: 1939: 1935: 1934:ISO 9288:1989 1931: 1925: 1923: 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1329: 1325: 1320: 1316: 1315: 1299: 1287: 1283: 1277: 1273: 1270: 1267: 1264: 1260: 1255: 1251: 1249: 1245: 1241: 1237: 1233: 1230:Radiant flux 1229: 1227: 1223: 1220: 1217: 1214: 1208: 1204: 1202: 1198: 1194: 1191: 1187: 1183: 1180: 1177: 1174: 1170: 1165: 1161: 1160: 1156: 1152: 1146: 1142: 1139: 1136: 1133: 1129: 1124: 1120: 1116: 1112: 1108: 1104: 1100: 1098: 1094: 1091: 1088: 1085: 1079: 1075: 1073: 1069: 1066: 1062: 1058: 1055: 1052: 1049: 1045: 1040: 1036: 1035: 1031: 1025: 1021: 1017: 1014: 1011: 1008: 1004: 999: 995: 993: 989: 985: 981: 979: 975: 971: 968: 966: 962: 960: 956: 950: 946: 944: 940: 937: 933: 929: 926: 923: 920: 916: 909: 908: 902: 898: 894: 891: 889: 885: 883: 879: 875: 868: 866: 865:Spectral flux 862: 858: 854: 852: 848: 844: 841: 838: 835: 833: 830: 822: 820: 816: 812: 810: 806: 802: 799: 796: 793: 787: 783: 781: 777: 773: 771: 767: 763: 760: 758: 755: 753: 750: 744: 740: 738: 734: 720: 706: 699: 694: 692: 687: 685: 680: 679: 671: 666: 664: 662: 654: 651: 648: 641: 638: 637: 636: 619: 614: 610: 602: 588: 584: 576: 567: 559: 558: 557: 555: 547: 545: 543: 524: 518: 505: 496: 486: 481: 478: 472: 463: 455: 454: 453: 448: 444: 440: 438: 419: 413: 400: 391: 381: 376: 373: 367: 358: 350: 349: 348: 343: 339: 332: 330: 328: 324: 319: 317: 310: 303: 300: 293: 289: 285: 284:azimuth angle 281: 274: 266: 262: 259: 256: 248: 245: 241: 240: 239: 222: 190: 182: 173: 165: 164: 163: 161: 154: 150: 143: 138: 136: 134: 130: 126: 122: 121: 116: 112: 96: 88: 84: 80: 76: 72: 68: 64: 60: 56: 52: 48: 44: 37: 33: 19: 1959: 1953: 1942:. Retrieved 1933: 1857: 1821: 1737: 1701: 1697: 1693: 1680: 1675: 1666: 1660: 1656: 1643: 1638: 1624: 1620: 1614: 1610: 1595: 1582: 1578: 1574: 1561: 1556: 1547: 1541: 1537: 1524: 1519: 1505: 1501: 1495: 1491: 1476: 1463: 1459: 1455: 1442: 1437: 1428: 1422: 1418: 1405: 1400: 1386: 1382: 1376: 1372: 1357: 1344: 1340: 1336: 1323: 1318: 1281: 1275: 1271: 1258: 1253: 1235: 1231: 1225: 1221: 1206: 1201:Flux density 1189: 1185: 1181: 1168: 1163: 1154: 1150: 1144: 1140: 1127: 1122: 1106: 1102: 1096: 1092: 1077: 1064: 1060: 1056: 1043: 1038: 1029: 1023: 1019: 1015: 1002: 997: 991: 983: 977: 973: 969: 948: 942: 935: 931: 927: 914: 900: 896: 892: 873: 850: 846: 842: 819:Radiant flux 808: 804: 800: 785: 769: 765: 761: 742: 670: 658: 652: 639: 634: 551: 541: 539: 446: 442: 441: 436: 434: 341: 337: 336: 326: 322: 320: 315: 308: 301: 297:follows the 291: 279: 272: 271:In general, 270: 260: 255:radiant flux 237: 159: 152: 148: 147: 132: 118: 74: 58: 51:radiant flux 46: 40: 1752:quantities. 1155:directional 1107:directional 1030:directional 984:directional 265:solid angle 160:directional 75:directional 55:solid angle 2008:Radiometry 1997:Categories 1944:2015-03-15 1911:References 1854:wavelength 1746:quantities 1723:Photometry 1718:Radiometry 1708:See also: 1310:10 Jy 1302:1 sfu 1197:Irradiance 1137:W⋅sr⋅m⋅Hz 1032:quantity. 986:quantity. 857:luminosity 714:Dimension 647:irradiance 445:, denoted 340:, denoted 151:, denoted 111:irradiance 67:wavelength 43:radiometry 1818:frequency 1352:Radiosity 1290:1 Jy 959:steradian 957:watt per 880:watt per 708:Quantity 580:Ω 519:λ 516:∂ 509:Ω 493:∂ 482:λ 476:Ω 414:ν 411:∂ 404:Ω 388:∂ 377:ν 371:Ω 242:∂ is the 217:Ω 214:∂ 201:Φ 197:∂ 186:Ω 120:intensity 87:steradian 63:frequency 1894:See also 1232:received 1072:Radiance 1012:W⋅sr⋅Hz 71:spectrum 1900:Candela 1667:surface 1653:J⋅m⋅Hz 1625:surface 1621:surface 1548:surface 1534:W⋅m⋅Hz 1506:surface 1502:emitted 1429:surface 1415:W⋅m⋅Hz 1387:surface 1383:leaving 1282:surface 1268:W⋅m⋅Hz 1236:surface 1178:W⋅sr⋅m 1151:surface 1103:surface 1089:W⋅sr⋅m 1053:W⋅sr⋅m 731:Symbol 725:Symbol 645:is the 554:antenna 263:is the 253:is the 246:symbol; 125:physics 107:W·sr·nm 99:W·sr·Hz 79:SI unit 49:is the 1966:  1750:photon 1296:) and 1286:jansky 839:= J/s 717:Notes 635:where 540:where 435:where 238:where 103:W·sr·m 57:, and 1504:by a 1234:by a 882:hertz 752:joule 728:Name 722:Name 711:Unit 450:e,Ω,λ 345:e,Ω,ν 95:hertz 1964:ISBN 1690:J/m 1607:J/m 1571:W/m 1488:W/m 1452:W/m 1369:W/m 1333:W/m 1218:W/m 1167:e,Ω, 1126:e,Ω, 1042:e,Ω, 1001:e,Ω, 924:W/m 832:watt 797:J/m 314:cos 113:and 91:W/sr 85:per 83:watt 1938:ISO 1782:or 1774:or 1312:). 1081:e,Ω 952:e,Ω 305:e,Ω 295:e,Ω 276:e,Ω 156:e,Ω 65:or 41:In 1999:: 1936:. 1932:. 1919:^ 1878:". 1867:^ 1862:". 1835:^ 1828:nu 1799:^ 1757:^ 1713:SI 1679:e, 1642:e, 1560:e, 1523:e, 1441:e, 1404:e, 1322:e, 1308:= 1304:= 1292:= 1257:e, 965:sr 963:W/ 913:e, 888:Hz 886:W/ 872:e, 556:: 318:. 307:= 290:, 135:. 45:, 1972:. 1947:. 1876:Ω 1859:λ 1823:ν 1792:W 1788:I 1784:F 1780:P 1776:E 1772:W 1702:T 1700:⋅ 1698:L 1696:⋅ 1694:M 1681:λ 1676:H 1661:T 1659:⋅ 1657:M 1644:ν 1639:H 1615:T 1613:⋅ 1611:M 1599:e 1596:H 1583:T 1581:⋅ 1579:L 1577:⋅ 1575:M 1562:λ 1557:M 1542:T 1540:⋅ 1538:M 1525:ν 1520:M 1496:T 1494:⋅ 1492:M 1480:e 1477:M 1464:T 1462:⋅ 1460:L 1458:⋅ 1456:M 1443:λ 1438:J 1423:T 1421:⋅ 1419:M 1406:ν 1401:J 1377:T 1375:⋅ 1373:M 1361:e 1358:J 1345:T 1343:⋅ 1341:L 1339:⋅ 1337:M 1324:λ 1319:E 1300:( 1288:( 1276:T 1274:⋅ 1272:M 1259:ν 1254:E 1226:T 1224:⋅ 1222:M 1210:e 1207:E 1190:T 1188:⋅ 1186:L 1184:⋅ 1182:M 1169:λ 1164:L 1145:T 1143:⋅ 1141:M 1128:ν 1123:L 1097:T 1095:⋅ 1093:M 1078:L 1065:T 1063:⋅ 1061:L 1059:⋅ 1057:M 1044:λ 1039:I 1024:T 1022:⋅ 1020:L 1018:⋅ 1016:M 1003:ν 998:I 978:T 976:⋅ 974:L 972:⋅ 970:M 949:I 936:T 934:⋅ 932:L 930:⋅ 928:M 915:λ 911:Φ 901:T 899:⋅ 897:L 895:⋅ 893:M 874:ν 870:Φ 851:T 849:⋅ 847:L 845:⋅ 843:M 837:W 826:e 824:Φ 809:T 807:⋅ 805:L 803:⋅ 801:M 789:e 786:w 770:T 768:⋅ 766:L 764:⋅ 762:M 757:J 746:e 743:Q 697:e 690:t 683:v 653:r 643:e 640:E 620:, 615:2 611:r 606:) 603:r 600:( 594:e 589:E 585:= 577:, 573:e 568:I 542:λ 525:, 506:, 502:e 497:I 487:= 479:, 473:, 469:e 464:I 447:I 437:ν 420:, 401:, 397:e 392:I 382:= 374:, 368:, 364:e 359:I 342:I 327:Ω 323:Ω 316:θ 312:0 309:I 302:I 292:I 280:θ 273:I 267:. 261:Ω 251:e 249:Φ 223:, 206:e 191:= 183:, 179:e 174:I 153:I 97:( 89:( 38:. 20:)

Index

Radiation intensity
Radiation flux
Light intensity (disambiguation)
radiometry
radiant flux
solid angle
frequency
wavelength
spectrum
SI unit
watt
steradian
hertz
irradiance
radiant exitance
intensity
physics
radio-frequency engineering
partial derivative
radiant flux
solid angle
azimuth angle
Lambertian surface
Lambert's cosine law
antenna
irradiance
inverse-square law
v
t
e

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