1、BRITISH STANDARD BS EN 61920:2004 Infrared free air applications The European Standard EN 61920:2004 has the status of a British Standard ICS 31.260; 33.100 BS EN 61920:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 26 April 2004 BSI 26
2、 April 2004 ISBN 0 580 43710 8 National foreword This British Standard is the official English language version of EN 61920:2004. It is identical with IEC 61920:2004. It supersedes BS EN 61920:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/1
3、00, Audio, video and multimedia systems and equipment, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this
4、 document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a cont
5、ract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals f
6、or change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 28, an inside back cover and a back cover. The BSI copyri
7、ght notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 61920 NORME EUROPENNE EUROPISCHE NORM March 2004 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalis
8、ation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2004 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61920:2004 E ICS 31.260; 33.100 Supersedes EN
9、61920:1998English version Infrared free air applications (IEC 61920:2004) Applications infrarouge en mode non guid (CEI 61920:2004) Nichtleitungsgebundene Infrarot-Anwendungen (IEC 61920:2004) This European Standard was approved by CENELEC on 2004-03-01. CENELEC members are bound to comply with the
10、CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or
11、to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other 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 officia
12、l versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia,
13、 Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 100/717/FDIS, future edition 2 of IEC 61920, prepared by IEC TC 100, Audio, video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61920 on 2004-03-01.
14、This European Standard supersedes EN 61920:1998. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-12-01 latest date by which the national standards conflicting with the EN
15、 have to be withdrawn (dow) 2007-03-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61920:2004 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be add
16、ed for the standards indicated: IEC 60825-1 NOTE Harmonized as EN 60825-1:1994 (not modified). IEC 61603-1 NOTE Harmonized as EN 61603-1:1997 (not modified). IEC 61603-2 NOTE Harmonized as EN 61603-2:1997 (not modified). IEC 61603-3 NOTE Harmonized as EN 61603-3:1998 (not modified). IEC 61603-6 NOTE
17、 Harmonized as EN 61603-6:2002 (not modified). _ Page2 EN61920:2004 CONTENTS 1 Scope and object4 2 Normative references4 3 Terms and definitions .5 4 Symbols.8 4.1 General.8 4.2 Radiators.8 4.3 Receivers8 5 Classification9 5.1 General.9 5.2 Physical characteristics of radiators .9 5.2.1 General.9 5.
18、2.2 Ranges of wavelength (criterion 1) .9 5.2.3 Ranges of frequency (criterion 2) .11 5.2.4 Radiant intensity (criterion 3) .11 5.2.5 Angle of radiation (criterion 4) 11 5.2.6 Duration of radiation (criterion 5)11 5.2.7 Identification example for a radiator .12 5.3 Physical characteristics of receiv
19、ers.12 5.3.1 General.12 5.3.2 Ranges of wavelength and selectivity (criterion 6) 12 5.3.3 Frequency response (criterion 7)13 5.3.4 Sensitivity (criterion 8) .13 5.3.5 Directivity (criterion 9)13 5.3.6 Example of a receiver 13 5.4 Tolerances 14 5.4.1 Measurement conditions 14 5.4.2 Tolerances of data
20、.14 5.5 Product groups 16 5.6 User areas.17 5.7 Graphical representation of IR systems17 6 Method for minimizing mutual interferences 19 7 Marking20 8 Relationship between IR basic standard and application standards20 Annex A (informative) Example for possible priorization21 Annex B (informative) Ex
21、amples of /f-diagrams.22 Annex C (informative) Survey of standardization activities in the field of Infrared.26 Annex ZA (normative) Normative references to international publications with their corresponding European publications27 Bibliography28 Page3 EN61920:2004 INFRARED FREE AIR APPLICATIONS 1
22、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 interference is caused by the increasing parallel application of different infrared (IR) systems. Due to its
23、 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 free air application which intentionally or unintentionally use IR radiation in this range, are incl
24、uded. 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 facility planners to take into consideration and to foresee provisions against disturbance of IR app
25、lication 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 is intended to identify each IR product by its characteristics, according to the classification
26、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 excluded. In this context “free air” means freely radiated IR in indoor or outdoor applications. If t
27、he 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). NOTE The reader should be aware that a risk of interference between different infrared systems as assessed
28、 by this standard is based on general parameters and therefore cannot take all the parameters involved into account. In many cases the practical results may differ from those expected, for example the positioning of sender and receiver and the choice of advanced coding and decoding schemes. All thes
29、e factors beyond the physical layer may have an effect on the final result. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the refere
30、nced document (including any amendments) applies. IEC 60050-713:1998, International Electrotechnical Vocabulary (IEV) Part 713: Radio- communications: transmitters, receivers, networks and operation IEC 60050-845:1987, International Electrotechnical Vocabulary (IEV) Chapter 845: Lighting Page4 EN619
31、20:2004 IEC 60417-DB:2002 1 , Graphical symbols for use on equipment IEC 60747-5-1:1997, Discrete semiconductor devices and integrated circuits Part 5-1: Optoelectronic devices General ISO/IEC 7498-1:1994, Information technology Open systems interconnection Basic reference model: The basic model 3 T
32、erms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 bandwidth (of a receiver, amplifier or network) extent of a continuous range of electrical frequencies or optical wavelengths over which the response does not differ from its nominal value by more
33、than a specified amount IEV 713-06-19, modified 3.2 directivity defined by two angles Aand Bfor describing the dependence of the receivers sensitivity from the direction of incidence. The direction in which the receiver output V mV is maximum might be called optical receiver axis. s max. /2 s max. /
34、2 s max. s max. /2 s max. /2 B A IEC 2895/03Figure 1 Directivity and related characteristics In a sensitivity diagram, the two angles Aand Bwithin which the sensitivity is greater than or equal to half of the maximum sensitivity (see Figure 1) characterize the directivity IEC 60747-5-1, 6.3.5.2, mod
35、ified 3.3 fluorescent lamp discharge lamp of the low pressure mercury type in which most of the light is emitted by one or several layers of phosphors excited by the ultraviolet radiation from the discharge IEV 845-07-26 3.4 harmonic integer multiple of a basic frequency _ 1DB refers to the IEC on-l
36、ine database. Page5 EN61920:2004 3.5 interference disturbance experienced in the reception of a wanted signal, caused by an unwanted signal or noise 3.6 infrared radiation optical radiation for which the wavelengths are longer than those for visible radiation IEV 845-01-04 NOTE For infrared radiatio
37、n, the range between 780 nm and 1 mm is commonly subdivided into: IR-A 780 nm to 1 400 nm; IR-B 1,4 m to 3 m; IR-C 3 m to 1 mm. 3.7 infrared system system which uses IR radiation in free air application consisting of IR radiator and IR receiver 3.8 irradiance E irradiance (at a point of a surface) i
38、s the quotient of the radiant flux d e incident on an element of the surface containing the point, by the area dA of that element E = d e /dA NOTE Irradiance is expressed in mW/m. IEV 845-01-37 3.9 modulation frequency electrical signal frequency which modulates the IR radiation 3.10 peak intensity
39、I pmaximum intensity I p mW/sr of the optical radiation inside the optical radiation pattern NOTE It should be taken into account that a different radiation pattern may occur in different wavelength ranges in the same application. 3.11 radiant intensity I equotient of the radiant flux d eleaving the
40、 source and propagated in the element of solid angle d containing the given direction, by the element of solid angle I e = d e /d NOTE Radiant intensity is expressed in mW/sr. IEV 845-01-30 3.12 radiation characteristic defined by two angles Aand Bfor describing the beam characteristic of IR emissio
41、n. References are the points of half optical radiant intensity. A is the angle of maximum divergence, Bis the angle perpendicular to the plane expanded by A , where A B (similar to 3.2) Page6 EN61920:2004 3.13 relative spectral electrical output V rfof a receiver is its output V f mV/Hz as a functio
42、n of the frequency f divided through its maximum value V maxmV/Hz V rf= V f /V max 100 NOTE Relative spectral electrical output is expressed in %. 3.14 relative spectral sensitivity s rratio of the sensitivity s of the detector at wavelength to a given reference value s maxs r= s /s max 100 NOTE Rel
43、ative spectral sensitivity is expressed in %. IEV 845-05-57, modified 3.15 (maximum) spectral sensitivity s(max) quotient of the (maximum) current of the photo diode I (max) A/nm and the irradiance E mW/m as a function of the wavelength s max= I max /E NOTE Spectral sensitivity is expressed in (A m)
44、/(mW nm). IEV 845-05-56, modified 3.16 steradian SI unit of solid angle. Solid angle that, having its 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 3.17 wavelength distanc
45、e in the direction of propagation of a periodic wave between two successive points at which the phase is the same IEV 845-01-14 3.18 radiator IR emitting source, consisting of one or more emitter components, with a specific radiation characteristic 3.19 (selective) receiver one or more IR detectors,
46、 which are mostly embedded in signal processing components and representing a specific IR receiving directivity NOTE Selective receivers have a limited spectral bandwidth within the whole IR spectrum. Page7 EN61920:2004 4 Symbols 4.1 General As this document is concerned with interference, commonly
47、between two different IR systems (for example between the radiators of a system 1 and the receivers of a system 2), symbols of similar or equal meaning such as bandwidths B i , wavelengths ior frequencies f ishall be identified in the following by the index 1 for radiators ( system 1) and index 2 fo
48、r receivers ( system 2). 4.2 Radiators B 1felectrical bandwidth kHz B 1optical bandwidth nm f 1modulation frequency kHz f pfrequency at the modulated peak intensity I pfkHz f 1llower band limiting frequency kHz f 1u upper band limiting frequency kHz I o time averaged total optical radiant intensity
49、mW/sr I p total optical peak intensity mW/sr I pspectral optical peak intensity mW/(sr nm) I espectral optical radiant intensity mW/(sr nm) I efspectral modulated radiant intensity mW/(sr Hz) I pfspectral modulated peak intensity mW/(sr Hz) sr steradian Aangle of maximum divergence Bangle perpendicular to
