1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58ICS 37.020Optics and photonics Spectral bandsBRITISH STANDARDBS ISO 20473:2007BS ISO 20473:2007This
2、 British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 50811 0contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments i
3、ssued since publicationAmd. No. Date Commentswavelength bands, where, for example, in the field of thermal imaging the cut-on and cut-off wavelengths of these bands are defined differently.Users should also note that the wavelength band covered by the definition of UV-A in this standard is not the s
4、ame as the older CIE (Commission internationale de lclairage) definition. Where this can give rise to legal or other difficulties an indication should be given of which definition is being used.This publication does not purport to include all the necessary provisions of a National forewordThis Briti
5、sh Standard is the UK implementation of ISO 20473:2007.The UK participation in its preparation was entrusted to Technical Committee CPW/172, Optics and photonics.A list of organizations represented on this committee can be obtained on request to its secretary.Users should note that the definitions g
6、iven in this standard apply only to the field of ophthalmology. This applies particularly to the definitions of Reference numberISO 20473:2007(E)INTERNATIONAL STANDARD ISO20473First edition2007-04-15Optics and photonics Spectral bands Optique et photonique Bandes spectrales BS ISO 20473:2007ii iiiFo
7、reword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a tec
8、hnical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters o
9、f electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated
10、to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible fo
11、r identifying any or all such patent rights. ISO 20473 was prepared by Technical Committee ISO/TC 172, Optics and photonics. BS ISO 20473:2007iv Introduction This International Standard is intended to support the delimitation, designation and description of the spectral wavelength regions of optical
12、 radiation for applications in the field of optics and photonics. BS ISO 20473:20071Optics and photonics Spectral bands 1 Scope This International Standard specifies the division of optical radiation into spectral bands for optics and photonics. It does not apply to lighting or telecommunication app
13、lications or to protection against hazards from optical radiation in occupational areas. 2 Definitions of spectral bands The division of the optical radiation in spectral bands is given in Table 1. The spectral bands are specified by the given wavelength limits. The band limits are included in both
14、adjacent bands. The relation of frequency, wave number and photon energy to the wavelength holds strictly, only for vacuum; if applicable, the refractive index of the medium of propagation shall be taken into account. As given in Table 1, the usage of the term “light” is restricted to designate “vis
15、ible radiation”, i.e. the wavelength range from 380 nm to 780 nm and should not be used for optical radiation outside the visible range. Table 1 Spectral bands for optics and photonics Spectral bandsaDesignation of the radiation Short designation Wavelength nm Frequency THz Wavenumber cm1Photon ener
16、gy QeeV extreme UV EUV 1 to 100 3 105to 3 000 107to 1051 240 to 12,4 vacuum UV VUV 100 to 190 3 000 to 1 580 105to 53 000 12,4 to 6,5 deep UV UV-C DUV 190 to 280 1 580 to 1 070 53 000 to 36 000 6,5 to 4,4 mid UV UV-B 280 to 315 1 070 to 950 36 000 to 32 000 4,4 to 3,9 Ultraviolet radiation near UV U
17、V UV-Ab315 to 380 950 to 790 32 000 to 26 000 3,9 to 3,3 Visible radiation, light VIS 380 to 780 790 to 385 26 000 to 13 000 3,3 to 1,6 IR-A 780 to 1400 385 to 215 13 000 to 7 000 1,6 to 0,9 near IR IR-B NIR 1 400 to 3 000 215 to 100 7 000 to 3 300 0,9 to 0,4 mid IR MIR 3 000 to 50 000 100 to 6 3 30
18、0 to 200 0,4 to 0,025 Infrared radiation far IR IR IR-C FIR 50 000 to 1066 to 0,3 200 to 10 0,025 to 0,001 aThe wavelength values are valid for delimitation of the spectral bands. The values for frequencies, wave numbers and photon energies are approximate values given for convenience. bFor other fi
19、elds of application, which are excluded from the scope of this International Standard, there may be different definitions. For example, IEC 60050-845:1987, identical with CIE Publication No 17.4, for its purpose, defines the upper limit of the UV-A band as 400 nm (see also Annex A). BS ISO 20473:200
20、72 Annex A (informative) Reasons behind the choice of 380 nm for the upper limit of UV-A A.1 Qualitative comment In the 1930s, the CIE (Commission internationale de lclairage) set the limits for UV-A as 315 nm to 400 nm. The CIE limits are based on the bio-actinic effects of radiation and they overl
21、ap with their limits for visible radiation, for which the International Lighting Vocabulary (CIE Publication No. 17.4, identical with publication IEC 60050-845:1987) term 845-01-03 states: “the lower limit is generally taken between 360 nm and 400 nm”, the variation depending “upon the amount of rad
22、iant power reaching the retina and the responsivity of the observer”. While the CIE definition generally takes precedence, for purposes of applications, differing definitions may be more appropriate. Hence, for the purposes of this International Standard for application in the field of optics and ph
23、otonics, it was felt that a fixed limit should be set between UV-A and the visible region, and the chosen value of 380 nm falls in the middle of the CIE range for the lower limit for visible radiation. Moreover, this limit of 380 nm is in line with the upper limit for UV-A used in both ophthalmic op
24、tics and general-wear sunglasses, which have taken the waveband for UV-A as 315 nm to 380 nm for many years. A.2 Ophthalmic optics and general-wear sunglasses Most resin ophthalmic spectacle lenses, even when untinted, have good absorption in the 315 nm to 380 nm waveband, or can be treated to have
25、good absorption without becoming coloured. Some resin materials cannot be treated to absorb the 380 nm to 400 nm waveband, whilst others which can be so treated begin to show a faint yellow discolouration. This can be masked by adding very small amounts of a blue dye, but this then gives a reduction
26、 in the luminous transmittance of the lens. Concern has been raised that the wearer of a pair of spectacles or sunglasses that absorb well up to 380 nm, but poorly between 380 nm and 400 nm, may be at risk of damage to ocular health. For the unprotected eye, two factors influence the effects of UV r
27、adiation: firstly, the intensity of solar radiation rises rapidly from the UV-B region to the infrared region; secondly, the bio-actinic effect or the ability for the radiation to cause damage drops rapidly. The product of the solar spectral irradiance and the relative spectral effectiveness functio
28、n is the weighting function for a calculation of the effect of the solar radiation to the eye (see ISO 13666). When calculating the effects of the solar UV radiation for the protected or corrected eye, the sunglass or spectacle lens transmittance is multiplied by the weighting function as given in A
29、nnex A of ISO 13666:1998. Because of the low value of the weighting function towards the longer wavelength end of the UV-A spectrum, classing the incremental waveband from 380 nm to 400 nm as UV rather than visible spectrum has very little effect on eye protection for the normal wearer. BS ISO 20473
30、:20073Bibliography 1 ISO 13666:1998, Ophthalmic optics Spectacle lenses Vocabulary 2 IEC 60050-845:1987, IEV, International Electrotechnical Vocabulary. Lighting 3 CIE Publication No 17.4, International Lighting Vocabulary BS ISO 20473:2007BS ISO BSI389 Chiswick High RoadLondonW4 4AL20473:2007BSI Br
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