250:
478:
384:
143:
1371:
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".
413:
319:
1329:
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".
1746:
1105:
per unit frequency or wavelength. This is sometimes also confusingly called "spectral intensity". Non-SI units of spectral flux density include
1252:
per unit frequency or wavelength. The latter is commonly measured in W⋅m⋅nm. This is sometimes also confusingly called "spectral intensity".
516:
676:
Radiant energy emitted, reflected, transmitted or received, per unit time. This is sometimes also called "radiant power", and called
245:{\displaystyle H_{\mathrm {e} }={\frac {\partial Q_{\mathrm {e} }}{\partial A}}=\int _{0}^{T}E_{\mathrm {e} }(t)\,\mathrm {d} t,}
1490:
per unit frequency or wavelength. The latter is commonly measured in J⋅m⋅nm. This is sometimes also called "spectral fluence".
509:
82:
78:
1782:
502:
849:
Radiant intensity per unit frequency or wavelength. The latter is commonly measured in W⋅sr⋅nm. This is a
473:{\displaystyle H_{\mathrm {e} ,\lambda }={\frac {\partial H_{\mathrm {e} }}{\partial \lambda }},}
17:
1712:
1562:
1215:
1172:
600:
1068:
1569:
should be denoted with suffix "e" (for "energetic") to avoid confusion with photometric or
974:
per unit frequency or wavelength. The latter is commonly measured in W⋅sr⋅m⋅nm. This is a
803:
Radiant flux emitted, reflected, transmitted or received, per unit solid angle. This is a
8:
1787:
1543:
379:{\displaystyle H_{\mathrm {e} ,\nu }={\frac {\partial H_{\mathrm {e} }}{\partial \nu }},}
137:
726:
Radiant flux per unit frequency or wavelength. The latter is commonly measured in W⋅nm.
257:
101:) and that of spectral exposure in wavelength is the joule per square metre per metre (
1448:
integrated over time of irradiation. This is sometimes also called "radiant fluence".
1566:
935:
812:
763:
1756:
1760:
1751:
1334:
1291:
93:), while that of spectral exposure in frequency is the joule per square metre per
1118:
28:
1722:
557:
47:
1776:
1755:, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "
1764:
1651:, not to be confused with a letter "v", indicating a photometric quantity.)
1021:
685:
639:
978:
quantity. This is sometimes also confusingly called "spectral intensity".
1648:
1717:
1674:
1538:
1064:
1017:
677:
74:
58:
35:
1210:
per unit area. This is sometimes also confusingly called "intensity".
1059:
per unit area. This is sometimes also confusingly called "intensity".
1638:
1587:
1585:
1583:
1581:
1579:
785:
779:
70:
892:
1576:
930:
quantity. This is sometimes also confusingly called "intensity".
1570:
1106:
27:"Fluence" redirects here. For the car produced by Renault, see
922:
Radiant flux emitted, reflected, transmitted or received by a
708:
702:
577:
572:
94:
86:
657:
652:
1696:
1679:
1643:
926:, per unit solid angle per unit projected area. This is a
81:
is taken as a function of frequency or of wavelength. The
1533:
416:
322:
146:
105:)—commonly the joule per square metre per nanometre (
1669:
1667:
1665:
1663:
1661:
1659:
1657:
1691:
1689:
472:
378:
244:
1654:
1774:
1695:Directional quantities are denoted with suffix "
1686:
1633:
1631:
1629:
1627:
1625:
1623:
1621:
1444:per unit area, or equivalently irradiance of a
996:watt per steradian per square metre, per metre
955:watt per steradian per square metre per hertz
136:("e" for "energetic", to avoid confusion with
1618:
510:
1556:
112:
1742:
1740:
1738:
1206:(emitted, reflected and transmitted by) a
517:
503:
230:
65:integrated over time of irradiation, and
1735:
14:
1775:
487:
1452:
1333:
1214:
1063:
934:
811:
684:
595:Energy of electromagnetic radiation.
537:
534:
531:
528:
1591:Alternative symbols sometimes seen:
907:watt per steradian per square metre
294:
1673:Spectral quantities given per unit
1637:Spectral quantities given per unit
117:
57:per unit area, or equivalently the
24:
1752:Compendium of Chemical Terminology
1508:joule per square metre, per metre
458:
450:
441:
423:
364:
356:
347:
329:
232:
215:
182:
174:
165:
153:
25:
1799:
1471:joule per square metre per hertz
1389:watt per square metre, per metre
1270:watt per square metre, per metre
1151:watt per square metre, per metre
69:is the radiant exposure per unit
1352:watt per square metre per hertz
1233:watt per square metre per hertz
1086:watt per square metre per hertz
634:Radiant energy per unit volume.
394:Spectral exposure in wavelength
281:is the duration of irradiation;
300:Spectral exposure in frequency
227:
221:
13:
1:
1728:
1440:Radiant energy received by a
871:watt per steradian per metre
830:watt per steradian per hertz
7:
1706:
1565:recommend that radiometric
140:quantities), is defined as
85:of radiant exposure is the
77:, depending on whether the
10:
1804:
26:
1677:are denoted with suffix "
1641:are denoted with suffix "
1528:
1485:
1409:
1366:
1290:
1247:
1171:
1100:
1016:
969:
891:
848:
762:
725:
638:
599:
556:
551:
548:
545:
542:
113:Mathematical definitions
1765:10.1351/goldbook.R05042
1563:Standards organizations
1425:joule per square metre
1713:Exposure (photography)
1486:Radiant exposure of a
1367:Radiant exitance of a
1306:watt per square metre
1187:watt per square metre
1036:watt per square metre
615:joule per cubic metre
601:Radiant energy density
474:
380:
269:is the radiant energy;
246:
1615:for radiant exitance.
1069:Spectral flux density
475:
381:
247:
1599:for radiant energy,
414:
320:
144:
1783:Physical quantities
1065:Spectral irradiance
939:Specific intensity
525:
497:SI radiometry units
488:SI radiometry units
484:is the wavelength.
208:
1607:for radiant flux,
1216:Spectral radiosity
813:Spectral intensity
494:
470:
390:is the frequency.
376:
290:is the irradiance.
258:partial derivative
242:
194:
89:per square metre (
1552:
1551:
1454:Spectral exposure
1335:Spectral exitance
936:Spectral radiance
764:Radiant intensity
465:
371:
295:Spectral exposure
189:
67:spectral exposure
16:(Redirected from
1795:
1767:
1757:Radiant exposure
1744:
1700:
1693:
1684:
1671:
1652:
1647:" (Greek letter
1635:
1616:
1614:
1611:for irradiance,
1610:
1606:
1602:
1598:
1594:
1589:
1574:
1560:
1505:
1468:
1422:
1411:Radiant exposure
1386:
1349:
1303:
1292:Radiant exitance
1267:
1230:
1184:
1148:
1132:
1128:
1124:
1116:
1112:
1101:Irradiance of a
1083:
1033:
993:
952:
904:
868:
827:
775:
739:
698:
649:
612:
569:
526:
519:
512:
505:
498:
493:
479:
477:
476:
471:
466:
464:
456:
455:
454:
453:
439:
434:
433:
426:
410:, is defined as
385:
383:
382:
377:
372:
370:
362:
361:
360:
359:
345:
340:
339:
332:
316:, is defined as
251:
249:
248:
243:
235:
220:
219:
218:
207:
202:
190:
188:
180:
179:
178:
177:
163:
158:
157:
156:
123:Radiant exposure
118:Radiant exposure
108:
104:
100:
92:
40:radiant exposure
21:
1803:
1802:
1798:
1797:
1796:
1794:
1793:
1792:
1773:
1772:
1771:
1770:
1745:
1736:
1731:
1709:
1704:
1703:
1694:
1687:
1672:
1655:
1636:
1619:
1612:
1608:
1604:
1600:
1596:
1592:
1590:
1577:
1561:
1557:
1548:
1504:
1495:
1467:
1458:
1421:
1415:
1385:
1376:
1348:
1339:
1302:
1296:
1266:
1257:
1248:Radiosity of a
1229:
1220:
1183:
1177:
1147:
1138:
1130:
1126:
1122:
1119:solar flux unit
1114:
1110:
1082:
1073:
1067:
1032:
1026:
1020:
992:
983:
951:
942:
938:
903:
897:
867:
858:
826:
817:
774:
768:
742:watt per metre
738:
731:
697:
690:
648:
644:
611:
605:
568:
562:
524:
523:
496:
490:
457:
449:
448:
444:
440:
438:
422:
421:
417:
415:
412:
411:
409:
363:
355:
354:
350:
346:
344:
328:
327:
323:
321:
318:
317:
315:
297:
289:
268:
231:
214:
213:
209:
203:
198:
181:
173:
172:
168:
164:
162:
152:
151:
147:
145:
142:
141:
135:
120:
115:
106:
102:
98:
90:
32:
29:Renault Fluence
23:
22:
15:
12:
11:
5:
1801:
1791:
1790:
1785:
1769:
1768:
1733:
1732:
1730:
1727:
1726:
1725:
1723:Radiant energy
1720:
1715:
1708:
1705:
1702:
1701:
1685:
1653:
1617:
1575:
1554:
1553:
1550:
1549:
1547:
1546:
1541:
1536:
1530:
1526:
1525:
1512:
1509:
1506:
1499:
1492:
1491:
1484:
1475:
1472:
1469:
1462:
1456:
1450:
1449:
1438:
1429:
1426:
1423:
1419:
1413:
1407:
1406:
1393:
1390:
1387:
1380:
1373:
1372:
1365:
1356:
1353:
1350:
1343:
1337:
1331:
1330:
1319:
1310:
1307:
1304:
1300:
1294:
1288:
1287:
1274:
1271:
1268:
1261:
1254:
1253:
1246:
1237:
1234:
1231:
1224:
1218:
1212:
1211:
1200:
1191:
1188:
1185:
1181:
1175:
1169:
1168:
1155:
1152:
1149:
1142:
1135:
1134:
1127:10 W⋅m⋅Hz
1115:10 W⋅m⋅Hz
1099:
1090:
1087:
1084:
1077:
1071:
1061:
1060:
1049:
1040:
1037:
1034:
1030:
1024:
1014:
1013:
1000:
997:
994:
987:
980:
979:
970:Radiance of a
968:
959:
956:
953:
946:
940:
932:
931:
920:
911:
908:
905:
901:
895:
889:
888:
875:
872:
869:
862:
855:
854:
847:
834:
831:
828:
821:
815:
809:
808:
801:
788:
782:
776:
772:
766:
760:
759:
746:
743:
740:
733:
728:
727:
724:
711:
705:
699:
692:
688:
682:
681:
680:in Astronomy.
674:
661:
655:
650:
646:
642:
636:
635:
632:
619:
616:
613:
609:
603:
597:
596:
593:
580:
575:
570:
566:
560:
558:Radiant energy
554:
553:
550:
547:
544:
540:
539:
536:
533:
530:
522:
521:
514:
507:
499:
495:
489:
486:
469:
463:
460:
452:
447:
443:
437:
432:
429:
425:
420:
404:
375:
369:
366:
358:
353:
349:
343:
338:
335:
331:
326:
310:
296:
293:
292:
291:
287:
282:
276:
270:
266:
261:
241:
238:
234:
229:
226:
223:
217:
212:
206:
201:
197:
193:
187:
184:
176:
171:
167:
161:
155:
150:
133:
119:
116:
114:
111:
48:radiant energy
9:
6:
4:
3:
2:
1800:
1789:
1786:
1784:
1781:
1780:
1778:
1766:
1762:
1758:
1754:
1753:
1748:
1743:
1741:
1739:
1734:
1724:
1721:
1719:
1716:
1714:
1711:
1710:
1698:
1692:
1690:
1682:
1681:
1676:
1670:
1668:
1666:
1664:
1662:
1660:
1658:
1650:
1646:
1645:
1640:
1634:
1632:
1630:
1628:
1626:
1624:
1622:
1588:
1586:
1584:
1582:
1580:
1572:
1568:
1564:
1559:
1555:
1545:
1542:
1540:
1537:
1535:
1532:
1531:
1527:
1524:
1520:
1516:
1513:
1510:
1507:
1503:
1498:
1494:
1493:
1489:
1483:
1479:
1476:
1473:
1470:
1466:
1461:
1457:
1455:
1451:
1447:
1443:
1439:
1437:
1433:
1430:
1427:
1424:
1418:
1414:
1412:
1408:
1405:
1401:
1397:
1394:
1391:
1388:
1384:
1379:
1375:
1374:
1370:
1364:
1360:
1357:
1354:
1351:
1347:
1342:
1338:
1336:
1332:
1328:
1324:
1321:Radiant flux
1320:
1318:
1314:
1311:
1308:
1305:
1299:
1295:
1293:
1289:
1286:
1282:
1278:
1275:
1272:
1269:
1265:
1260:
1256:
1255:
1251:
1245:
1241:
1238:
1235:
1232:
1228:
1223:
1219:
1217:
1213:
1209:
1205:
1202:Radiant flux
1201:
1199:
1195:
1192:
1189:
1186:
1180:
1176:
1174:
1170:
1167:
1163:
1159:
1156:
1153:
1150:
1146:
1141:
1137:
1136:
1120:
1108:
1104:
1098:
1094:
1091:
1088:
1085:
1081:
1076:
1072:
1070:
1066:
1062:
1058:
1054:
1051:Radiant flux
1050:
1048:
1044:
1041:
1038:
1035:
1029:
1025:
1023:
1019:
1015:
1012:
1008:
1004:
1001:
998:
995:
991:
986:
982:
981:
977:
973:
967:
963:
960:
957:
954:
950:
945:
941:
937:
933:
929:
925:
921:
919:
915:
912:
909:
906:
900:
896:
894:
890:
887:
883:
879:
876:
873:
870:
866:
861:
857:
856:
852:
846:
842:
838:
835:
832:
829:
825:
820:
816:
814:
810:
806:
802:
800:
796:
792:
789:
787:
783:
781:
777:
771:
767:
765:
761:
758:
754:
750:
747:
744:
741:
737:
730:
729:
723:
719:
715:
712:
710:
706:
704:
700:
696:
689:
687:
686:Spectral flux
683:
679:
675:
673:
669:
665:
662:
659:
656:
654:
651:
643:
641:
637:
633:
631:
627:
623:
620:
617:
614:
608:
604:
602:
598:
594:
592:
588:
584:
581:
579:
576:
574:
571:
565:
561:
559:
555:
541:
527:
520:
515:
513:
508:
506:
501:
500:
492:
485:
483:
467:
461:
445:
435:
430:
427:
418:
408:
403:
399:
395:
391:
389:
373:
367:
351:
341:
336:
333:
324:
314:
309:
305:
301:
286:
283:
280:
277:
274:
271:
265:
262:
259:
255:
254:
253:
239:
236:
224:
210:
204:
199:
195:
191:
185:
169:
159:
148:
139:
132:
128:
124:
110:
96:
88:
84:
80:
76:
72:
68:
64:
60:
56:
52:
49:
45:
41:
37:
30:
19:
1750:
1678:
1642:
1558:
1522:
1518:
1514:
1501:
1496:
1487:
1481:
1477:
1464:
1459:
1453:
1445:
1441:
1435:
1431:
1416:
1410:
1403:
1399:
1395:
1382:
1377:
1368:
1362:
1358:
1345:
1340:
1326:
1322:
1316:
1312:
1297:
1284:
1280:
1276:
1263:
1258:
1249:
1243:
1239:
1226:
1221:
1207:
1203:
1197:
1193:
1178:
1165:
1161:
1157:
1144:
1139:
1102:
1096:
1092:
1079:
1074:
1056:
1052:
1046:
1042:
1027:
1022:Flux density
1010:
1006:
1002:
989:
984:
975:
971:
965:
961:
948:
943:
927:
923:
917:
913:
898:
885:
881:
877:
864:
859:
850:
844:
840:
836:
823:
818:
804:
798:
794:
790:
769:
756:
752:
748:
735:
721:
717:
713:
694:
671:
667:
663:
640:Radiant flux
629:
625:
621:
606:
590:
586:
582:
563:
491:
481:
406:
401:
397:
393:
392:
387:
312:
307:
303:
299:
298:
284:
278:
275:is the area;
272:
263:
130:
126:
122:
121:
66:
62:
54:
50:
43:
39:
33:
1573:quantities.
976:directional
928:directional
851:directional
805:directional
138:photometric
1788:Radiometry
1777:Categories
1729:References
1718:Irradiance
1675:wavelength
1567:quantities
1544:Photometry
1539:Radiometry
1529:See also:
1131:10 Jy
1123:1 sfu
1018:Irradiance
958:W⋅sr⋅m⋅Hz
853:quantity.
807:quantity.
678:luminosity
535:Dimension
400:, denoted
306:, denoted
129:, denoted
75:wavelength
59:irradiance
36:radiometry
1639:frequency
1173:Radiosity
1111:1 Jy
780:steradian
778:watt per
701:watt per
529:Quantity
462:λ
459:∂
442:∂
431:λ
368:ν
365:∂
348:∂
337:ν
256:∂ is the
196:∫
183:∂
166:∂
71:frequency
1707:See also
1053:received
893:Radiance
833:W⋅sr⋅Hz
79:spectrum
63:surface,
51:received
1488:surface
1474:J⋅m⋅Hz
1446:surface
1442:surface
1369:surface
1355:W⋅m⋅Hz
1327:surface
1323:emitted
1250:surface
1236:W⋅m⋅Hz
1208:surface
1204:leaving
1103:surface
1089:W⋅m⋅Hz
1057:surface
999:W⋅sr⋅m
972:surface
924:surface
910:W⋅sr⋅m
874:W⋅sr⋅m
552:Symbol
546:Symbol
398:surface
304:surface
260:symbol;
127:surface
83:SI unit
55:surface
46:is the
44:fluence
18:Fluence
1571:photon
1117:) and
1107:jansky
660:= J/s
538:Notes
480:where
386:where
252:where
107:J⋅m⋅nm
99:J⋅m⋅Hz
1747:IUPAC
1325:by a
1055:by a
703:hertz
573:joule
549:Name
543:Name
532:Unit
396:of a
302:of a
125:of a
95:hertz
87:joule
61:of a
53:by a
1511:J/m
1428:J/m
1392:W/m
1309:W/m
1273:W/m
1190:W/m
1154:W/m
1039:W/m
988:e,Ω,
947:e,Ω,
863:e,Ω,
822:e,Ω,
745:W/m
653:watt
618:J/m
1761:doi
1759:".
1603:or
1595:or
1133:).
902:e,Ω
773:e,Ω
109:).
103:J/m
91:J/m
73:or
42:or
34:In
1779::
1749:,
1737:^
1699:".
1688:^
1683:".
1656:^
1649:nu
1620:^
1578:^
1534:SI
1500:e,
1463:e,
1381:e,
1344:e,
1262:e,
1225:e,
1143:e,
1129:=
1125:=
1113:=
1078:e,
786:sr
784:W/
734:e,
709:Hz
707:W/
693:e,
405:e,
311:e,
38:,
1763::
1697:Ω
1680:λ
1644:ν
1613:W
1609:I
1605:F
1601:P
1597:E
1593:W
1523:T
1521:⋅
1519:L
1517:⋅
1515:M
1502:λ
1497:H
1482:T
1480:⋅
1478:M
1465:ν
1460:H
1436:T
1434:⋅
1432:M
1420:e
1417:H
1404:T
1402:⋅
1400:L
1398:⋅
1396:M
1383:λ
1378:M
1363:T
1361:⋅
1359:M
1346:ν
1341:M
1317:T
1315:⋅
1313:M
1301:e
1298:M
1285:T
1283:⋅
1281:L
1279:⋅
1277:M
1264:λ
1259:J
1244:T
1242:⋅
1240:M
1227:ν
1222:J
1198:T
1196:⋅
1194:M
1182:e
1179:J
1166:T
1164:⋅
1162:L
1160:⋅
1158:M
1145:λ
1140:E
1121:(
1109:(
1097:T
1095:⋅
1093:M
1080:ν
1075:E
1047:T
1045:⋅
1043:M
1031:e
1028:E
1011:T
1009:⋅
1007:L
1005:⋅
1003:M
990:λ
985:L
966:T
964:⋅
962:M
949:ν
944:L
918:T
916:⋅
914:M
899:L
886:T
884:⋅
882:L
880:⋅
878:M
865:λ
860:I
845:T
843:⋅
841:L
839:⋅
837:M
824:ν
819:I
799:T
797:⋅
795:L
793:⋅
791:M
770:I
757:T
755:⋅
753:L
751:⋅
749:M
736:λ
732:Φ
722:T
720:⋅
718:L
716:⋅
714:M
695:ν
691:Φ
672:T
670:⋅
668:L
666:⋅
664:M
658:W
647:e
645:Φ
630:T
628:⋅
626:L
624:⋅
622:M
610:e
607:w
591:T
589:⋅
587:L
585:⋅
583:M
578:J
567:e
564:Q
518:e
511:t
504:v
482:λ
468:,
451:e
446:H
436:=
428:,
424:e
419:H
407:λ
402:H
388:ν
374:,
357:e
352:H
342:=
334:,
330:e
325:H
313:ν
308:H
288:e
285:E
279:T
273:A
267:e
264:Q
240:,
237:t
233:d
228:)
225:t
222:(
216:e
211:E
205:T
200:0
192:=
186:A
175:e
170:Q
160:=
154:e
149:H
134:e
131:H
97:(
31:.
20:)
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