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1、BRITISH STANDARD BS EN 61920:1998 IEC 61920: 1998 Infrared transmission systems Free air applications The European Standard EN 61920:1998 has the status of a British Standard ICS 31.260; 33.100 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
2、 BS EN 61920:1998 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1998 BSI 04-1999 ISBN 0 580 29943 0 National foreword This British Standard is the English
3、 language version of EN 61920:1998. It is identical with IEC 61920:1998. It supersedes DD ENV 50185-1, DD ENV 50185-2 and DD ENV 50185-3:1996, which will be withdrawn on 2001-01-01. The UK participation in its preparation was entrusted by Technical Committee EPL/100, Audio, video and multimedia syst
4、ems and equipment, to Subcommittee EPL/100/3, Equipment and systems in the field of audio, video and audiovisual engineering, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or pro
5、posals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the numbe
6、r 60 000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references Attention is drawn to the fact that CEN and CENELE
7、C Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which implement these international or European publications referred to in this document may be found in the BSI Standards Catal
8、ogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their c
9、orrect application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 22 and a back cover. This standard has been updated (see copy
10、right date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 619
11、20:1998 BSI 04-1999i Contents Page National forewordInside front cover Foreword2 Text of EN 619203 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncon
12、trolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61920 April 1998 ICS 31.260; 33.100Supersedes ENV 50185-1:1995, ENV 50185-2:1996 and ENV 50185-3:1995 Descriptors: Sound transmission, electroacoustic equipment, video equipment, infrared radiation, definitions, classificatio
13、ns, parasitic signals, electromagnetic compatibility, characteristics, measurements, wavelengths, frequencies, marking English version Infrared transmission systems Free air applications (IEC 61920:1998) Systmes de transmission infrarouge Applications en mode non guid (CEI 61920:1998) Infrarot-bertr
14、agungssysteme Nicht-leitungsgebundene Anwendungen (IEC 61920:1998) This European Standard was approved by CENELEC on 1998-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national sta
15、ndard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any ot
16、her language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland
17、, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normu
18、ng Central Secretariat: rue de Stassart 35, B-1050 Brussels 1998 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61920:1998 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
19、 EN 61920:1998 BSI 04-1999 2 Foreword The text of document 100C/198/FDIS, future edition 1 of IEC 61920, prepared by SC 100C, Audio, video and multimedia subsystems and equipment, of IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was
20、 approved by CENELEC as EN 61920 on 1998-04-01. This European Standard supersedes ENV 50185-1:1995, ENV 50185-2:1996 and ENV 50185-3:1995. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated “informative” are given for information o
21、nly. In this standard, Annex ZA is normative and Annex A, Annex B, Annex C and Annex D are informative. Annex ZA has been added by CENELEC. Endorsement notice The text of the International Standard IEC 61920:1998 was approved by CENELEC as a European Standard without any modification. Contents Page
22、Foreword2 1Scope and object3 2Normative references3 3Definitions3 4Symbols5 5Classification5 5.1Physical characteristics5 5.1.1Ranges of wavelength (criterion 1)6 5.1.2Ranges of frequency (criterion 2)6 Page 5.1.3Radiant intensity (criterion 3)7 5.1.4Angle of radiation (criterion 4)7 5.1.5Duration o
23、f radiation (criterion 5)7 5.1.6Identification example7 5.1.7Measurement8 5.2Product groups9 5.3User areas10 5.4Graphical representation of IR systems12 6Method for minimizing mutual interferences12 7Marking12 8Relationship between this standard and application standards12 Annex A (informative) Exam
24、ple for possible prioritization13 Annex B (informative) Examples of /f-diagrams13 Annex C (informative) Survey of standardization activities in the field of infrared21 Annex D (informative) Bibliography21 Annex ZA (normative) Normative references to international publications with their correspondin
25、g European publications22 Figure 1 Spectral emission and definition of optical bandwidth6 Figure 2 Spectral emission and definition of electrical bandwidth7 Figure 3 Blank /f-diagram11 Figure 4 Symbol for infrared12 Figure B.1 Residential14 Figure B.2 Office15 Figure B.3 Industrial16 Figure B.4 Medi
26、cal17 Figure B.5 Conference18 Figure B.6 Traffic19 Figure B.7 Typical spectral emission of fluorescent lamps20 Table 1 Classification criteria8 Table 2 Product groups of IR systems9 Table A.1 Possible priority of product groups within user areas13 Table C.1 Current survey of standardization activiti
27、es21 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1999-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 2001-01-01 Licensed Copy: sheffieldun sheffieldun,
28、 na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61920:1998 BSI 04-19993 1 Scope and object This International Standard describes the classification of IR devices into groups and classes in order to identify and clarify problems caused by mutual interference. Mutual interferenc
29、e is caused by the increasing parallel application of different infrared (IR) systems. Due to its physical characteristics, the possibility of local limitation is a special feature of IR radiation. In this standard, the wavelength range from 700 nm to 1 600 nm is considered. All systems based on fre
30、e air application which intentionally or unintentionally use IR radiation in this range, are included. Products which unintentionally emit IR radiation, such as illumination equipment are not deemed to be IR application systems. They are, however, integrated into this standard in order to enable fac
31、ility planners to take into consideration and to foresee provisions against disturbance of IR application systems by such unintentionally emitted radiation. The object of this standard is to prevent or at least to minimize mutual interference and to allow the coexistence of different IR products. It
32、 is intended to identify each IR product by its characteristics, according to the classification criteria. It is not the object of this standard to describe the consequences of interference between IR systems or safety aspects of optical radiation. All applications of fibre-optic technology are excl
33、uded. In this context “free air” means freely radiated IR in indoor or outdoor applications. If the IR systems are used for information transmission, this standard is only relevant in connection with the physical layer of the open systems interconnection (OSI) reference model (ISO 7498-1). 2 Normati
34、ve references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements ba
35、sed on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. Members of the IEC and ISO maintain registers of currently valid International Standards. IEC 60050(60):1970, International Electrotechnic
36、al Vocabulary (IEV): Radiocommunications1). IEC 60050(845):1987, International Electrotechnical Vocabulary (IEV) Chapter 845: Lighting. IEC 60747-5:1992, Semiconductor devices Discrete devices and integrated circuits Part 5: Optoelectronic devices. ISO 7498-1:1994, Information technology Open system
37、 interconnection Basic reference model. 3 Definitions For the purpose of this International Standard the following definitions apply: 3.1 bandwidth of a receiver, amplifier or network the extent of a continuous range of electrical frequencies or optical wavelengths over which the response does not d
38、iffer from its nominal value by more than a specified amount IEV 60-12-025 extended 3.2 fluorescent lamp a discharge lamp of the low pressure mercury type in which most of the light is emitted by one or several layers of phosphor excited by the ultraviolet radiation from the discharge IEV 845-07-26
39、3.3 harmonic integral multiple of a basic frequency 1) Partially replaced by IEC 60050(725). Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61920:1998 4 BSI 04-1999 3.4 interference disturbance experienced in the reception of a wanted si
40、gnal, caused by an unwanted signal or noise 3.5 infrared radiation optical radiation for which the wavelengths are longer than those for visible radiation IEV 845-01-04 NOTEFor infrared radiation, the range between 780 nm and 1 mm is commonly subdivided into: IR-A 780 nm to 1 400 nm IR-B 1,4 4m to 3
41、 4m IR-C3 4m to 1 mm 3.6 infrared system system which uses IR radiation in free air application consisting of IR emitters and IR receivers 3.7 modulation frequency electrical signal frequency which modulates the IR radiation 3.8 peak intensity maximum intensity lp (mW/sr) of the optical radiation in
42、 the direction of maximum emission around the rated wavelength p 3.9 radiant intensity quotient of the radiant flux e leaving the source and propagated in the element of solid angle d containing the given direction, by the element of solid angle IEV 845-01-30 3.10 radiation characteristic defined by
43、 two angles 1 and 2 for describing the focusing of IR emission. References are the points of half optical radiant intensity. 1 is the angle of maximum divergence, 2 is the angle perpendicular to the plane expanded by 1, where 1$ 2. 3.11 steradian SI unit of solid angle: solid angle that, having its
44、vertex at the centre of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere IEV 845-01-20 (ISO 31/1-2.1,1978) 3.12 subharmonic integral divisor of a basic frequency 3.13 wavelength distance in the direction of propa
45、gation of a periodic wave between two successive points at which the phase is the same IEV 845-01-14 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61920:1998 BSI 04-19995 4 Symbols 5 Classification The classification considers three mai
46、n aspects for system description: physical characteristics (see 5.1); product groups (see 5.2); user areas (see 5.3). NOTEIn the future, the IR system definitions should include selective IR receivers. 5.1 Physical characteristics There are five criteria on which the classification for physical char
47、acteristics is based. They are operating characteristics, selected from the rated values given by the manufacturer (see Table 1). Bfbandwidth of the modulated radiant intensity (kHz) Bbandwidth of the optical radiant intensity (nm) fmodulation frequency (kHz) fpfrequency at the modulated peak intens
48、ity lpf (kHz) fllower band limiting frequency (kHz) fuupper band limiting frequency (kHz) lotime averaged total optical radiant intensity (mW/sr) lptotal optical peak intensity (mW/sr) lpspectral optical peak intensity mW/(sr nm) lespectral optical radiant intensity mW/(sr nm) lefspectral modulated
49、radiant intensity mW/(sr Hz) lpfspectral modulated peak intensity mW/(sr Hz) srsteradian wavelength (nm) pwavelength at the optical peak intensity lp (nm) llower band limiting wavelength (nm) uupper band limiting wavelength (nm) Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 06:57:12 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61920:1998 6 BSI 04-1999 5.1.1 Ranges of wavelength (criterion 1) The lower (l) and the upper (u) optical wavelengths determine the op