DSH 656 Equivalent measurement setup for the Condition 1 for certain laser beams

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DSH 656 / C3 I$ N6 ?2 _/ g

Equivalent measurement setup for the Condition 1 for certain laser beams ! b" k4 \( u9 U5 R, W+ a

Clause 9.1 Tests Clause 9.2 Measurement of laser radiation Clause 9.3 Measurement geometry 8 m+ L% J% y& r& M6 ~

60825-1(ed.1);am1;am2 & 60825-1(ed.2) 6 o3 D+ D' Q$ y" h

/ z4 y: c$ l( M; ~Standard(s):
$ ?; N  j3 ^) \0 MIEC 60825-1, Ed 1.2 (2001) & Ed 2.0 (2007)
Sub clause(s):
2 f4 s% M9 _* n" j% j% ZClause 9.1 Tests
Clause 9.2 Measurement of laser radiation
Clause 9.3 Measurement geometry
" _0 D& u4 Q" qDecision Sheet n°: DSH 656
Subject: Equivalent measurement setup for the Condition 1 for certain laser beams
8 P! l# c3 S7 e5 _( P' A- p" q0 xKey words:
. D$ G. h6 J1 s& g  J" T; F- Condition 1
6 a! k) p- ~- S$ C. I* I! i' Z- Telescoping viewing
- Aperture stop
1 o, u( d- C) ]: Y, }Approved by the 45th CTL Plenary meeting 2008
3 W+ B# e: f) J9 \- l9 F! qQuestion:
1 {6 q) k/ {# x" x; `Is it necessary to always use a 50 mm aperture stop in order to fulfil the requirements for the measuring Condition 1?
. F" ?( {0 Q# F) V( L8 D9 oDecision:
5 S2 w( U( }, eIf the laser beam is well collimated so that the entire radiant power is passing through a 7 mm aperture within 2000 mm distance, it is acceptable to use a 7 mm aperture stop for the purpose of testing according to Condition 1.
# F1 L4 w, [. D4 Z1 [: @) W. R9 rNote: National Certification Bodies shall provide objective evidence that the whole laser beam is captured with the reduced aperture size.
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