1、Traditional Chinese medicine Computerized tongue image analysis systemPart 2: Light environmentBS ISO 204982:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06 ISO 2017Traditional Chinese medicine Computerized tongue image analysis system Part 2: Light environmentM
2、decine traditionnelle chinoise Systme danalyse dimages numrises de la langue Partie 2: Environnement lumineuxINTERNATIONAL STANDARDISO20498-2First edition2017-05Reference numberISO 20498-2:2017(E)National forewordThis British Standard is the UK implementation of ISO 204982:2017.The UK participation
3、in its preparation was entrusted to Technical Committee CH/100/1, Traditional Chinese Medicine.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsi
4、ble for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 93534 3ICS 11.040.99Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards
5、 Policy and Strategy Committee on 31 July 2017.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS ISO 204982:2017 ISO 2017Traditional Chinese medicine Computerized tongue image analysis system Part 2: Light environmentMdecine traditionnelle chinoise Systme danalyse di
6、mages numrises de la langue Partie 2: Environnement lumineuxINTERNATIONAL STANDARDISO20498-2First edition2017-05Reference numberISO 20498-2:2017(E)BS ISO 204982:2017ISO 20498-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. U
7、nless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at th
8、e address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 204982:2017ISO 20498-2:2017(E)ii ISO 2017 All rights reservedCOPYRIGHT PROT
9、ECTED DOCUMENT ISO 2017, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prio
10、r written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgISO 20498-2
11、:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Technical requirements 14.1 Illuminance. 14.2 Colour temperature 24.3 Colour rendering index 24.4 Illumination distribution 24.5 Irradiance 24.6 Ultraviolet irradiance 25 Test methods . 25.1 Measuring points on effect
12、ive surface area 25.2 Illuminance. 35.3 Colour temperature 35.4 Colour rendering index 35.5 Illumination distribution 35.6 Irradiance 35.7 Ultraviolet irradiance 4Annex A (informative) Spectral weighting function for assessing ultraviolet hazards 5Bibliography 6 ISO 2017 All rights reserved iiiConte
13、nts PageBS ISO 204982:2017ISO 20498-2:2017(E)ForewordISO (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 membe
14、r body interested in a subject for which a technical 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 Elec
15、trotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types
16、of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).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
17、held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document is infor
18、mation given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (
19、WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 249, Traditional Chinese medicine.A list of all the parts in the ISO 20498 series can be found on the ISO website.iv ISO 2017 Al
20、l rights reservedBS ISO 204982:2017ISO 20498-2:2017(E)ForewordISO (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. E
21、ach member body interested in a subject for which a technical 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 Internati
22、onal Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the differe
23、nt types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shal
24、l not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www .iso .org/ patents).Any trade name used in this document
25、 is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organ
26、ization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www .iso .org/ iso/ foreword .html.This document was prepared by Technical Committee ISO/TC 249, Traditional Chinese medicine.A list of all the parts in the ISO 20498 series can be found on the ISO website.iv IS
27、O 2017 All rights reserved INTERNATIONAL STANDARD ISO 20498-2:2017(E)Traditional Chinese medicine Computerized tongue image analysis system Part 2: Light environment1 ScopeThis document specifies the light environment necessary for the functioning of a computerized tongue image analysis system (CTIS
28、).This document does not include the electrical safety and biocompatibility of the lighting component.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the ed
29、ition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.CIE 013.3-1995, Method of measuring and specifying colour rendering properties of light sources3 Terms and definitionsFor the purposes of this document, the following terms a
30、nd definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at h t t p :/ www .electropedia .org/ ISO Online browsing platform: available at h t t p :/ www .iso .org/ obp3.1effective surface areasurface on whic
31、h the patient rests according to the intended positionNote 1 to entry: The area can be specified in the accompanying documents.3.2light environmentoptical conditions on effective surface areaNote 1 to entry: This includes illuminance, colour temperature, colour rendering index, illumination distribu
32、tion, irradiance and ultraviolet irradiance.4 Technical requirements4.1 IlluminanceIlluminance should be between 500 lx and 13 000 lx. ISO 2017 All rights reserved 1BS ISO 204982:2017ISO 20498-2:2017(E)4.2 Colour temperatureColour temperature should be between 3 000 K and 7 000 K.4.3 Colour renderin
33、g indexColour rendering index should be more than 90.4.4 Illumination distributionThe relative illumination distribution on the effective surface area shall comply with the following condition:the ratio of illuminanceminto illuminancemaxshall be more than 0,9.4.5 IrradianceFor the spectral region 30
34、0 nm to 2 500 nm, the total irradiance shall not exceed 350 Wm2.NOTE 300 nm to 2 500 nm is the main spectral region which can produce thermal risk to retinal and skin.4.6 Ultraviolet irradianceFor the spectral region 200 nm to 400 nm, the effective ultraviolet irradiance shall not exceed 0,008 Wm2.5
35、 Test methods5.1 Measuring points on effective surface areaThe measuring area shall be divided into a number of congruent rectangular or square partial surfaces according to Figure 1. The grid is centred to cover the whole effective surface area. The measuring points are identical with the centres o
36、f the partial surfaces. The distances between the measuring points on the grid shall not exceed 3 cm.2 ISO 2017 All rights reservedBS ISO 204982:2017ISO 20498-2:2017(E)4.2 Colour temperatureColour temperature should be between 3 000 K and 7 000 K.4.3 Colour rendering indexColour rendering index shou
37、ld be more than 90.4.4 Illumination distributionThe relative illumination distribution on the effective surface area shall comply with the following condition:the ratio of illuminanceminto illuminancemaxshall be more than 0,9.4.5 IrradianceFor the spectral region 300 nm to 2 500 nm, the total irradi
38、ance shall not exceed 350 Wm2.NOTE 300 nm to 2 500 nm is the main spectral region which can produce thermal risk to retinal and skin.4.6 Ultraviolet irradianceFor the spectral region 200 nm to 400 nm, the effective ultraviolet irradiance shall not exceed 0,008 Wm2.5 Test methods5.1 Measuring points
39、on effective surface areaThe measuring area shall be divided into a number of congruent rectangular or square partial surfaces according to Figure 1. The grid is centred to cover the whole effective surface area. The measuring points are identical with the centres of the partial surfaces. The distan
40、ces between the measuring points on the grid shall not exceed 3 cm.2 ISO 2017 All rights reserved ISO 20498-2:2017(E)NOTE m and n are the number of partial surfaces in the direction of length a and width b.Figure 1 Example of a measuring grid5.2 IlluminanceSelect the measuring points described in 5.
41、1. Use an illuminance metre to measure the illuminance on each point. Every test value should comply with 4.1.5.3 Colour temperatureSelect the measuring points described in 5.1. Every test value should comply with 4.2.5.4 Colour rendering indexSelect the measuring points described in 5.1 and measure
42、 according to the methods in CIE 013.3-1995. Every test value should comply with 4.3.5.5 Illumination distributionSelect the measuring points described in 5.1. Use an illuminance metre to measure the illuminance on each point. Calculate the ratio of illuminanceminto illuminancemax. The value should
43、comply with 4.4.5.6 IrradianceSelect the maximum illuminance point described in 5.1. Measure the total irradiance spectral region 300 nm to 2 500 nm with a sensor whose diameter is no more than 3 cm. The test value should comply with 4.5. ISO 2017 All rights reserved 3BS ISO 204982:2017ISO 20498-2:2
44、017(E)5.7 Ultraviolet irradianceSelect the maximum illuminance point described in 5.1. Measure the irradiance spectral region 200 nm to 400 nm as E() (unit is Wm2nm1); effective ultraviolet irradiance is defined using Formula (1):EUV()()S200400 (1)where is the bandwidth in nm;SUV() is actinic ultrav
45、iolet hazard weighting function and its spectral values are shown in Annex A.The test value should comply with 4.6.4 ISO 2017 All rights reservedBS ISO 204982:2017ISO 20498-2:2017(E)5.7 Ultraviolet irradianceSelect the maximum illuminance point described in 5.1. Measure the irradiance spectral regio
46、n 200 nm to 400 nm as E() (unit is Wm2nm1); effective ultraviolet irradiance is defined using Formula (1):EUV()()S200400 (1)where is the bandwidth in nm;SUV() is actinic ultraviolet hazard weighting function and its spectral values are shown in Annex A.The test value should comply with 4.6.4 ISO 201
47、7 All rights reserved ISO 20498-2:2017(E)Annex A (informative) Spectral weighting function for assessing ultraviolet hazardsTable A.1 Spectral weighting function for assessing ultraviolet hazardsWavelength ()/nmaSUV()Wavelength ()/nmSUV()200 0,030 313b0,006205 0,051 315 0,003210 0,075 316 0,002 4215
48、 0,095 317 0,002 0220 0,120 318 0,001 6225 0,150 319 0,001 2230 0,190 320 0,001 0235 0,240 322 0,000 67240 0,300 323 0,000 54245 0,360 325 0,000 50250 0,430 328 0,000 44254b0,500 330 0,000 41255 0,520 333b0,000 37260 0,650 335 0,000 34265 0,810 340 0,000 28270 1,000 345 0,000 24275 0,960 350 0,000 2
49、0280b0,880 355 0,000 16285 0,770 360 0,000 13290 0,640 365b0,000 11295 0,540 370 0,000 093297b0,460 375 0,000 077300 0,300 380 0,000 064303b0,120 385 0,000 053305 0,060 390 0,000 044308 0,026 395 0,000 036310 0,015 400 0,000 030aWavelengths chosen are representative; other values should be obtained by logarithmic interpolation at intermediate wavelengths.bEmission lines of a mercury discharge spectrum.SOURCE: IEC 62471:2006, Table 4.1. ISO 2017
