IEC 60825-12-2004 pdf free download – Safety of laser products – Part 12: Safety of free space optical communication systems used for transmission of information.
This part of lEC 60825 provides requirements and specific guidance for the manufacture andsafe use of laser products and systems used for point-to-point or point-to-multipoint freespace optical data transmission.This standard only addresses the open beam portion of thesystem. If portions of the equipment or system incorporate optical fibre that extends from theconfinements of the enclosure(s), the manufacturing and safety requirements underIEC 60825-1 apply to those portions only.This standard does not apply to systems designedfor purposes of transmitting optical power for applications such as material processing ormedical treatment. This standard also does not apply to the use of systems in explosiveatmospheres.
Throughout this part of lEC 60825，light-emitting diodes (LEDs) are included whenever theword “laser” is used.
The objective of this part of lEC 60825 is to:
. provide information to protect people from potentially hazardous optical radiation producedby free space optical communication systems(Fsocs) by specifying engineering controlsand requirements，administrative controls and work practices according to the degree ofthe hazard;
. specify requirements for manufacturing, installation, service and operating organisations in
order to establish procedures and provide written information so that proper precautionscan be adopted.
Because of the nature of Fsocs, also known as optical wireless or free-air informationtransmission systems,care must be taken in their manufacture as well as their installation,operation, maintenance and service to assure the safe deployment and use of these systems.This standard places the responsibility for certain product safety requirements， as well asrequirements for providing appropriate information on how to use these systems safely, on themanufacturer of the system and/or transmitters. It places the responsibility for the safedeployment and use of these systems on the installer and/or operating organisation. It placesthe responsibility for adherence to safety instructions during installation and serviceoperations on the installation and service organisations as appropriate,and during operationand maintenance functions on the operating organisation. It is recognised that the user of thisstandard may fall into one or more of the categories of manufacturer，installer，serviceorganisation and/or operating organisation as mentioned above.
Any laser product is exempt from all further requirements of this part of lEC 60825 if
. classification by the manufacturer according to lEC 60825-1 shows that the emission level
does not exceed the accessible emission limit (AEL) of Class 1 under all conditions ofoperation,maintenance, service and failure, and
. it does not contain an embedded laser product.
2Normative 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 editionof the referenced document (including any amendments) applies.
IEC 60825-1:1993,Safety of laser products – Part 1: Equipment classification，requirementsand user’s guide 1)
Amendment 1 (1997)Amendment 2 (20o1)
IEC 60825-2,Safety of laser products – Part 2: Safety of optical fibre communication systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
access level
potential hazard at any accessible position associated with a free space opticalcommunication system (FSocs) installation
NOTE 1 The access level is based on the level of optical radiation which could become accessible in reasonablyforeseeable circumstances,e.g. walking into an open beam path. lt is closely related to the laser classificationprocedure in lEC60825-1.
NOTE 2 Practically speaking, it takes two or more seconds to fully align an optical aid with a beam (which mightoccur in an unrestricted location), and this delay is incorporated into the method for determining access level.
3.2
access level 1
level for which, under reasonably foreseeable circumstances, human access to laser radiationin excess of the accessible emission limits(AEL) of Class 1 for the applicable wavelengthsand emission duration will not occur
3.3
access level 1M
level for which, under reasonably foreseeable circumstances,human access to laser radiationin excess of the accessible emission limits (AEL) of Class 1M for the applicable wavelengthsand emission duration will not occur
NOTElf the applicable limit of access level 1M is larger than the limit of 3R and less than the limit of 3B,accesslevel 1M is allocated.
3.4
access level 2
level for which, under reasonably foreseeable circumstances, human access to laser radiationin excess of the accessible emission limits of Class 2 for the applicable wavelengths andemission duration will not occur. IEC 60825-12 pdf download.