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本帖最后由 小米 于 2012-11-6 13:18 编辑
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9 O8 W: g B# c |  DSH 1028 | Evaluation of spectrum of blue laser-based source projector, R; j; Y% e, s. m$ t( N
| 8.3 & 9
% Y1 l9 I; V; i2 |4 o3 t- q6 T | 60825-1(ed.2)+ {7 A5 L# a% b# o+ W& H8 M
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" j1 F- O% K: F4 F6 v/ {Standard(s) (incl. year) Subclause(s) No. Year- a% {0 D7 h8 x
IEC 60825-1: 2007 (2nd Edition) 8.3 & 9 PDSH& _ B" `$ @; w. T- S5 l9 |8 @
1028
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MISC
5 E" K3 i9 M9 I: ]* BSubject Keywords Developed by To be approved
7 r9 Z2 J# {* ]0 V0 G" a* PEvaluation of spectrum of blue" [6 @* X% R) [# k N2 y7 i
laser-based source projector/ b1 I& h. R( |4 p+ L, s" k
Laser projector, spectrum,1 a9 R5 C; D% `% f
fluorescent layer! N' j: X( o, r! C: c
ETF 11 2013 CTL1 ?- P4 ?/ V, k z
Plenary Meeting% O! \- w7 a! _" q9 W; R3 l
Question+ f1 k- ^* [3 ~ q/ R
A laser-based light engine projector emits a white light spectrum with three dominant colours (see the* T( ?9 A) Y9 s2 h
optical spectrum, Fig. 1 below, in comparison with the optical spectrum of a mercury lamp projector,
9 r }* r) c6 p. a2 G) mFig. 2). The blue light (ca. 440 nm) is generated by a blue laser diode; other wavelengths (with peaks6 ~& `1 t) M( ]& }4 }. J* G3 a
of green and red) are emitted from a fluorescent layer.
. K6 i" \* I$ A, l$ _+ h8 N) Y. q e% tIs it acceptable to evaluate the eye safety hazard according to IEC 60825-1 by only assessing the
$ i$ d) Y) j2 e4 r6 D( \emission in blue (thus disregarding other parts of the spectrum, i.e. green and red)?7 D: T* R, t' z- y0 V
Decision
1 Q' t& t5 u9 s" `3 g! ^% y( PNo. The coherent portion and incoherent portion of the entire spectrum shall be individually evaluated: p' {+ h- f f* U( X* Z
to the applicable hazards/requirements per IEC 60825-1 and IEC 62471 respectively.
4 n' b: l$ P8 f' k+ C% XMeasurements for calculations and determination of the respective applicable accessible emission' e5 ~% q0 d0 _! G. @# z4 ^
levels must reflect this for each and every possible radiation hazard." |* v( P' n4 c- r* `+ S
Notes: A/ ?* p5 d* I/ ?5 @' j$ E, Z. }
1. Due to the short-wavelength characteristics, which are associated with blue ray hazard, and the. U$ f2 L+ R$ C; G9 N
more stringent hazard limit for blue light, this blue light hazard may be over-classified if the total5 Q- e6 y- s' z+ Q9 U2 I7 V8 Q* h
power (from this light engine) is measured and considered in the allowable limit calculations. An$ J7 a5 k; @. k4 M0 ?- M
appropriate optical device may be used to filter out the blue light for the blue light hazard5 ^1 ?) n2 z/ |/ ~
measurements and evaluation.
& h3 {7 k; C9 Y' V/ ~" m2. Depending on its energy content, the remaining blue laser beam can be a very dangerous( u- V; H: ?* b
weapon, as it hides inside the seemingly safe broad-band white light to which users would not L2 N; B/ ^1 Z1 g1 S- d! u2 G
apply their behavioural/precautionary safety guard as they would to a sharp, bright, and' H& s; A4 _9 |
collimated blue laser beam. During the evaluation of the blue laser beam the following extra7 v9 k; \% S5 G$ p7 a, R
precautions shall be adequately taken:
8 z' R* Q4 e" K6 |8 h# M+ [# N8 ia. additional safeguarding& y! i) `5 H* d, r# g+ W4 ]* m
b. means of protection
, G4 N$ |8 Q& s8 |9 Ec. cautionary markings and/or instructions, etc , particularly if the remaining laser beam8 ~/ F* O' W! ~( L- n& l4 N- h
contains high energy content.
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发表于 2012-11-6 13:15
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