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本帖最后由 小米 于 2012-11-6 13:18 编辑 2 l& g, }0 y2 T
7 I0 d$ ~9 a: w$ t. e, v: Y9 q |  DSH 1028 | Evaluation of spectrum of blue laser-based source projector9 C6 K' B, S+ X
| 8.3 & 9
; M8 U# ]5 H7 A6 [ | 60825-1(ed.2)
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0 M3 D1 I) z& YStandard(s) (incl. year) Subclause(s) No. Year- r! R1 f# {) ]9 _* X
IEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH
: X, n* _( G8 G% K! _7 K1028% A2 U7 S$ b I8 X& v/ t7 \; c
2011
9 N! ~ |3 }' k: ^/ j# tCategory; ^8 C! V$ P( g& k7 }. ~
MISC( }% h0 K& t* m d6 s9 U7 d A$ Q8 r
Subject Keywords Developed by To be approved
% l: O3 R. F8 [Evaluation of spectrum of blue
7 _5 Y: Z3 p0 n) \1 Tlaser-based source projector
6 l! l; P. m& X0 K2 N/ ALaser projector, spectrum,9 B4 r, S' f9 [# V& ^$ o
fluorescent layer$ J+ d- x; D3 @% ?2 o y' `
ETF 11 2013 CTL
. l2 J; N/ g) [4 pPlenary Meeting
3 ~7 O$ L' A5 l4 S$ ^Question
, @2 E; I9 R4 ^* ]. K1 C/ s1 |A laser-based light engine projector emits a white light spectrum with three dominant colours (see the. d8 p/ ]! S& d$ X' g
optical spectrum, Fig. 1 below, in comparison with the optical spectrum of a mercury lamp projector,; ]+ N. b E+ Z. I
Fig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks7 ^( t" ~* ?# C J
of green and red) are emitted from a fluorescent layer." J3 H. s, t+ d6 r3 C
Is it acceptable to evaluate the eye safety hazard according to IEC 60825-1 by only assessing the9 ]' u L1 _7 }+ C* J9 D& I7 P
emission in blue (thus disregarding other parts of the spectrum, i.e. green and red)?4 E9 V5 q# [) _: @$ `5 t
Decision
0 k8 i! {) Y+ S0 | c- ONo. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated
2 [: V% H1 ^0 vto the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
% \- [6 Y4 r2 q: I: gMeasurements for calculations and determination of the respective applicable accessible emission
% @1 `& ~! `. Hlevels must reflect this for each and every possible radiation hazard.
$ w' D" ]" y* n4 ~# P' TNotes:
4 ] W) X! x6 P1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the
$ g. ~9 A5 U* T5 L4 Fmore stringent hazard limit for blue light, this blue light hazard may be over-classified if the total
& [' N% S. Y3 opower (from this light engine) is measured and considered in the allowable limit calculations. An
' i& j. x- q8 nappropriate optical device may be used to filter out the blue light for the blue light hazard. m& C+ X) j" j7 {8 x
measurements and evaluation.
3 D# I3 V8 M! W2. Depending on its energy content, the remaining blue laser beam can be a very dangerous
+ e: w) s# \. N4 F& J) {3 zweapon, as it hides inside the seemingly safe broad-band white light to which users would not
1 {. x( ^% E G/ e5 [" vapply their behavioural/precautionary safety guard as they would to a sharp, bright, and
8 @7 y. a' H" f: P f# Fcollimated blue laser beam. During the evaluation of the blue laser beam the following extra
9 y) ?. t2 K" k: P) Zprecautions shall be adequately taken:8 J. s* B0 i0 z+ ~+ w5 [
a. additional safeguarding9 n0 K5 w+ m) c0 \
b. means of protection
8 k# R6 Y0 L. u z7 r% yc. cautionary markings and/or instructions, etc , particularly if the remaining laser beam
, s0 ^7 U9 v. v2 | c# _# wcontains high energy content.0 @) B0 I7 p$ W- x3 a% b
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发表于 2012-11-6 13:15
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